Index: frontend/node_modules/postcss-selector-parser/API.md
===================================================================
--- frontend/node_modules/postcss-selector-parser/API.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/API.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,872 @@
+# API Documentation
+
+*Please use only this documented API when working with the parser. Methods
+not documented here are subject to change at any point.*
+
+## `parser` function
+
+This is the module's main entry point.
+
+```js
+const parser = require('postcss-selector-parser');
+```
+
+### `parser([transform], [options])`
+
+Creates a new `processor` instance
+
+```js
+const processor = parser();
+```
+
+Or, with optional transform function
+
+```js
+const transform = selectors => {
+    selectors.walkUniversals(selector => {
+        selector.remove();
+    });
+};
+
+const processor = parser(transform)
+
+// Example
+const result = processor.processSync('*.class');
+// => .class
+```
+
+[See processor documentation](#processor)
+
+Arguments:
+
+* `transform (function)`: Provide a function to work with the parsed AST.
+* `options (object)`: Provide default options for all calls on the returned `Processor`.
+
+### `parser.attribute([props])`
+
+Creates a new attribute selector.
+
+```js
+parser.attribute({attribute: 'href'});
+// => [href]
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.className([props])`
+
+Creates a new class selector.
+
+```js
+parser.className({value: 'button'});
+// => .button
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.combinator([props])`
+
+Creates a new selector combinator.
+
+```js
+parser.combinator({value: '+'});
+// => +
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+Notes:
+* **Descendant Combinators** The value of descendant combinators created by the
+  parser always just a single space (`" "`). For descendant selectors with no
+  comments, additional space is now stored in `node.spaces.before`. Depending
+  on the location of comments, additional spaces may be stored in
+  `node.raws.spaces.before`, `node.raws.spaces.after`, or `node.raws.value`.
+* **Named Combinators** Although, nonstandard and unlikely to ever become a standard,
+  named combinators like `/deep/` and `/for/` are parsed as combinators. The
+  `node.value` is name after being unescaped and normalized as lowercase. The
+  original value for the combinator name is stored in `node.raws.value`.
+
+
+### `parser.comment([props])`
+
+Creates a new comment.
+
+```js
+parser.comment({value: '/* Affirmative, Dave. I read you. */'});
+// => /* Affirmative, Dave. I read you. */
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.id([props])`
+
+Creates a new id selector.
+
+```js
+parser.id({value: 'search'});
+// => #search
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.nesting([props])`
+
+Creates a new nesting selector.
+
+```js
+parser.nesting();
+// => &
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.pseudo([props])`
+
+Creates a new pseudo selector.
+
+```js
+parser.pseudo({value: '::before'});
+// => ::before
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.root([props])`
+
+Creates a new root node.
+
+```js
+parser.root();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.selector([props])`
+
+Creates a new selector node.
+
+```js
+parser.selector();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.string([props])`
+
+Creates a new string node.
+
+```js
+parser.string();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.tag([props])`
+
+Creates a new tag selector.
+
+```js
+parser.tag({value: 'button'});
+// => button
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.universal([props])`
+
+Creates a new universal selector.
+
+```js
+parser.universal();
+// => *
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+## Node types
+
+### `node.type`
+
+A string representation of the selector type. It can be one of the following;
+`attribute`, `class`, `combinator`, `comment`, `id`, `nesting`, `pseudo`,
+`root`, `selector`, `string`, `tag`, or `universal`. Note that for convenience,
+these constants are exposed on the main `parser` as uppercased keys. So for
+example you can get `id` by querying `parser.ID`.
+
+```js
+parser.attribute({attribute: 'href'}).type;
+// => 'attribute'
+```
+
+### `node.parent`
+
+Returns the parent node.
+
+```js
+root.nodes[0].parent === root;
+```
+
+### `node.toString()`, `String(node)`, or `'' + node`
+
+Returns a string representation of the node.
+
+```js
+const id = parser.id({value: 'search'});
+console.log(String(id));
+// => #search
+```
+
+### `node.next()` & `node.prev()`
+
+Returns the next/previous child of the parent node.
+
+```js
+const next = id.next();
+if (next && next.type !== 'combinator') {
+    throw new Error('Qualified IDs are not allowed!');
+}
+```
+
+### `node.replaceWith(node)`
+
+Replace a node with another.
+
+```js
+const attr = selectors.first.first;
+const className = parser.className({value: 'test'});
+attr.replaceWith(className);
+```
+
+Arguments:
+
+* `node`: The node to substitute the original with.
+
+### `node.remove()`
+
+Removes the node from its parent node.
+
+```js
+if (node.type === 'id') {
+    node.remove();
+}
+```
+
+### `node.clone([opts])`
+
+Returns a copy of a node, detached from any parent containers that the
+original might have had.
+
+```js
+const cloned = node.clone();
+```
+
+### `node.isAtPosition(line, column)`
+
+Return a `boolean` indicating whether this node includes the character at the
+position of the given line and column. Returns `undefined` if the nodes lack
+sufficient source metadata to determine the position.
+
+Arguments:
+
+* `line`: 1-index based line number relative to the start of the selector.
+* `column`: 1-index based column number relative to the start of the selector.
+
+### `node.spaces`
+
+Extra whitespaces around the node will be moved into `node.spaces.before` and
+`node.spaces.after`. So for example, these spaces will be moved as they have
+no semantic meaning:
+
+```css
+      h1     ,     h2   {}
+```
+
+For descendent selectors, the value is always a single space.
+
+```css
+h1        h2 {}
+```
+
+Additional whitespace is found in either the `node.spaces.before` and `node.spaces.after` depending on the presence of comments or other whitespace characters. If the actual whitespace does not start or end with a single space, the node's raw value is set to the actual space(s) found in the source.
+
+### `node.source`
+
+An object describing the node's start/end, line/column source position.
+
+Within the following CSS, the `.bar` class node ...
+
+```css
+.foo,
+  .bar {}
+```
+
+... will contain the following `source` object.
+
+```js
+source: {
+    start: {
+        line: 2,
+        column: 3
+    },
+    end: {
+        line: 2,
+        column: 6
+    }
+}
+```
+
+### `node.sourceIndex`
+
+The zero-based index of the node within the original source string.
+
+Within the following CSS, the `.baz` class node will have a `sourceIndex` of `12`.
+
+```css
+.foo, .bar, .baz {}
+```
+
+## Container types
+
+The `root`, `selector`, and `pseudo` nodes have some helper methods for working
+with their children.
+
+### `container.nodes`
+
+An array of the container's children.
+
+```js
+// Input: h1 h2
+selectors.at(0).nodes.length   // => 3
+selectors.at(0).nodes[0].value // => 'h1'
+selectors.at(0).nodes[1].value // => ' '
+```
+
+### `container.first` & `container.last`
+
+The first/last child of the container.
+
+```js
+selector.first === selector.nodes[0];
+selector.last === selector.nodes[selector.nodes.length - 1];
+```
+
+### `container.at(index)`
+
+Returns the node at position `index`.
+
+```js
+selector.at(0) === selector.first;
+selector.at(0) === selector.nodes[0];
+```
+
+Arguments:
+
+* `index`: The index of the node to return.
+
+### `container.atPosition(line, column)`
+
+Returns the node at the source position `line` and `column`.
+
+```js
+// Input: :not(.foo),\n#foo > :matches(ol, ul)
+selector.atPosition(1, 1); // => :not(.foo)
+selector.atPosition(2, 1); // => \n#foo
+```
+
+Arguments:
+
+* `line`: The line number of the node to return.
+* `column`: The column number of the node to return.
+
+### `container.index(node)`
+
+Return the index of the node within its container.
+
+```js
+selector.index(selector.nodes[2]) // => 2
+```
+
+Arguments:
+
+* `node`: A node within the current container.
+
+### `container.length`
+
+Proxy to the length of the container's nodes.
+
+```js
+container.length === container.nodes.length
+```
+
+### `container` Array iterators
+
+The container class provides proxies to certain Array methods; these are:
+
+* `container.map === container.nodes.map`
+* `container.reduce === container.nodes.reduce`
+* `container.every === container.nodes.every`
+* `container.some === container.nodes.some`
+* `container.filter === container.nodes.filter`
+* `container.sort === container.nodes.sort`
+
+Note that these methods only work on a container's immediate children; recursive
+iteration is provided by `container.walk`.
+
+### `container.each(callback)`
+
+Iterate the container's immediate children, calling `callback` for each child.
+You may return `false` within the callback to break the iteration.
+
+```js
+let className;
+selectors.each((selector, index) => {
+    if (selector.type === 'class') {
+        className = selector.value;
+        return false;
+    }
+});
+```
+
+Note that unlike `Array#forEach()`, this iterator is safe to use whilst adding
+or removing nodes from the container.
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  and `index` arguments.
+
+### `container.walk(callback)`
+
+Like `container#each`, but will also iterate child nodes as long as they are
+`container` types.
+
+```js
+selectors.walk((selector, index) => {
+    // all nodes
+});
+```
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  and `index` arguments.
+
+This iterator is safe to use whilst mutating `container.nodes`,
+like `container#each`.
+
+### `container.walk` proxies
+
+The container class provides proxy methods for iterating over types of nodes,
+so that it is easier to write modules that target specific selectors. Those
+methods are:
+
+* `container.walkAttributes`
+* `container.walkClasses`
+* `container.walkCombinators`
+* `container.walkComments`
+* `container.walkIds`
+* `container.walkNesting`
+* `container.walkPseudos`
+* `container.walkTags`
+* `container.walkUniversals`
+
+### `container.split(callback)`
+
+This method allows you to split a group of nodes by returning `true` from
+a callback. It returns an array of arrays, where each inner array corresponds
+to the groups that you created via the callback.
+
+```js
+// (input) => h1 h2>>h3
+const list = selectors.first.split(selector => {
+    return selector.type === 'combinator';
+});
+
+// (node values) => [['h1', ' '], ['h2', '>>'], ['h3']]
+```
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  as an argument.
+
+### `container.prepend(node)` & `container.append(node)`
+
+Add a node to the start/end of the container. Note that doing so will set
+the parent property of the node to this container.
+
+```js
+const id = parser.id({value: 'search'});
+selector.append(id);
+```
+
+Arguments:
+
+* `node`: The node to add.
+
+### `container.insertBefore(old, new)` & `container.insertAfter(old, new)`
+
+Add a node before or after an existing node in a container:
+
+```js
+selectors.walk(selector => {
+    if (selector.type !== 'class') {
+        const className = parser.className({value: 'theme-name'});
+        selector.parent.insertAfter(selector, className);
+    }
+});
+```
+
+Arguments:
+
+* `old`: The existing node in the container.
+* `new`: The new node to add before/after the existing node.
+
+### `container.removeChild(node)`
+
+Remove the node from the container. Note that you can also use
+`node.remove()` if you would like to remove just a single node.
+
+```js
+selector.length // => 2
+selector.remove(id)
+selector.length // => 1;
+id.parent       // undefined
+```
+
+Arguments:
+
+* `node`: The node to remove.
+
+### `container.removeAll()` or `container.empty()`
+
+Remove all children from the container.
+
+```js
+selector.removeAll();
+selector.length // => 0
+```
+
+## Root nodes
+
+A root node represents a comma separated list of selectors. Indeed, all
+a root's `toString()` method does is join its selector children with a ','.
+Other than this, it has no special functionality and acts like a container.
+
+### `root.trailingComma`
+
+This will be set to `true` if the input has a trailing comma, in order to
+support parsing of legacy CSS hacks.
+
+## Selector nodes
+
+A selector node represents a single complex selector. For example, this
+selector string `h1 h2 h3, [href] > p`, is represented as two selector nodes.
+It has no special functionality of its own.
+
+## Pseudo nodes
+
+A pseudo selector extends a container node; if it has any parameters of its
+own (such as `h1:not(h2, h3)`), they will be its children. Note that the pseudo
+`value` will always contain the colons preceding the pseudo identifier. This
+is so that both `:before` and `::before` are properly represented in the AST.
+
+## Attribute nodes
+
+### `attribute.quoted`
+
+Returns `true` if the attribute's value is wrapped in quotation marks, false if it is not.
+Remains `undefined` if there is no attribute value.
+
+```css
+[href=foo] /* false */
+[href='foo'] /* true */
+[href="foo"] /* true */
+[href] /* undefined */
+```
+
+### `attribute.qualifiedAttribute`
+
+Returns the attribute name qualified with the namespace if one is given.
+
+### `attribute.offsetOf(part)`
+
+ Returns the offset of the attribute part specified relative to the
+ start of the node of the output string. This is useful in raising
+ error messages about a specific part of the attribute, especially
+ in combination with `attribute.sourceIndex`.
+
+ Returns `-1` if the name is invalid or the value doesn't exist in this
+ attribute.
+
+ The legal values for `part` are:
+
+ * `"ns"` - alias for "namespace"
+ * `"namespace"` - the namespace if it exists.
+ * `"attribute"` - the attribute name
+ * `"attributeNS"` - the start of the attribute or its namespace
+ * `"operator"` - the match operator of the attribute
+ * `"value"` - The value (string or identifier)
+ * `"insensitive"` - the case insensitivity flag
+
+### `attribute.raws.unquoted`
+
+Returns the unquoted content of the attribute's value.
+Remains `undefined` if there is no attribute value.
+
+```css
+[href=foo] /* foo */
+[href='foo'] /* foo */
+[href="foo"] /* foo */
+[href] /* undefined */
+```
+
+### `attribute.spaces`
+
+Like `node.spaces` with the `before` and `after` values containing the spaces
+around the element, the parts of the attribute can also have spaces before
+and after them. The for each of `attribute`, `operator`, `value` and
+`insensitive` there is corresponding property of the same nam in
+`node.spaces` that has an optional `before` or `after` string containing only
+whitespace.
+
+Note that corresponding values in `attributes.raws.spaces` contain values
+including any comments. If set, these values will override the
+`attribute.spaces` value. Take care to remove them if changing
+`attribute.spaces`.
+
+### `attribute.raws`
+
+The raws object stores comments and other information necessary to re-render
+the node exactly as it was in the source.
+
+If a comment is embedded within the identifiers for the `namespace`, `attribute`
+or `value` then a property is placed in the raws for that value containing the full source of the propery including comments.
+
+If a comment is embedded within the space between parts of the attribute
+then the raw for that space is set accordingly.
+
+Setting an attribute's property `raws` value to be deleted.
+
+For now, changing the spaces required also updating or removing any of the
+raws values that override them.
+
+Example: `[ /*before*/ href /* after-attr */ = /* after-operator */ te/*inside-value*/st/* wow */ /*omg*/i/*bbq*/ /*whodoesthis*/]` would parse as:
+
+```js
+{
+  attribute: "href",
+  operator: "=",
+  value: "test",
+  spaces: {
+    before: '',
+    after: '',
+    attribute: { before: '  ', after: '  ' },
+    operator: { after: '  ' },
+    value: { after: ' ' },
+    insensitive: { after: ' ' }
+  },
+  raws: {
+    spaces: {
+      attribute: { before: ' /*before*/ ', after: ' /* after-attr */ ' },
+      operator: { after: ' /* after-operator */ ' },
+      value: { after: '/* wow */ /*omg*/' },
+      insensitive: { after: '/*bbq*/ /*whodoesthis*/' }
+    },
+    unquoted: 'test',
+    value: 'te/*inside-value*/st'
+  }
+}
+```
+
+## `Processor`
+
+### `ProcessorOptions`
+
+* `lossless` - When `true`, whitespace is preserved. Defaults to `true`.
+* `updateSelector` - When `true`, if any processor methods are passed a postcss
+  `Rule` node instead of a string, then that Rule's selector is updated
+  with the results of the processing. Defaults to `true`.
+
+### `process|processSync(selectors, [options])`
+
+Processes the `selectors`, returning a string from the result of processing.
+
+Note: when the `updateSelector` option is set, the rule's selector
+will be updated with the resulting string.
+
+**Example:**
+
+```js
+const parser = require("postcss-selector-parser");
+const processor = parser();
+
+let result = processor.processSync(' .class');
+console.log(result);
+// =>  .class
+
+// Asynchronous operation
+let promise = processor.process(' .class').then(result => {
+    console.log(result)
+    // => .class
+});
+
+// To have the parser normalize whitespace values, utilize the options
+result = processor.processSync('  .class  ', {lossless: false});
+console.log(result);
+// => .class
+
+// For better syntax errors, pass a PostCSS Rule node.
+const postcss = require('postcss');
+rule = postcss.rule({selector: ' #foo    > a,  .class  '});
+processor.process(rule, {lossless: false, updateSelector: true}).then(result => {
+    console.log(result);
+    // => #foo>a,.class
+    console.log("rule:", rule.selector);
+    // => rule: #foo>a,.class
+})
+```
+
+Arguments:
+
+* `selectors (string|postcss.Rule)`: Either a selector string or a PostCSS Rule
+  node.
+* `[options] (object)`: Process options
+
+
+### `ast|astSync(selectors, [options])`
+
+Like `process()` and `processSync()` but after
+processing the `selectors` these methods return the `Root` node of the result
+instead of a string.
+
+Note: when the `updateSelector` option is set, the rule's selector
+will be updated with the resulting string.
+
+### `transform|transformSync(selectors, [options])`
+
+Like `process()` and `processSync()` but after
+processing the `selectors` these methods return the value returned by the
+processor callback.
+
+Note: when the `updateSelector` option is set, the rule's selector
+will be updated with the resulting string.
+
+### Error Handling Within Selector Processors
+
+The root node passed to the selector processor callback
+has a method `error(message, options)` that returns an
+error object. This method should always be used to raise
+errors relating to the syntax of selectors. The options
+to this method are passed to postcss's error constructor
+([documentation](http://postcss.org/api/#container-error)).
+
+#### Async Error Example
+
+```js
+let processor = (root) => {
+    return new Promise((resolve, reject) => {
+        root.walkClasses((classNode) => {
+            if (/^(.*)[-_]/.test(classNode.value)) {
+                let msg = "classes may not have underscores or dashes in them";
+                reject(root.error(msg, {
+                    index: classNode.sourceIndex + RegExp.$1.length + 1,
+                    word: classNode.value
+                }));
+            }
+        });
+        resolve();
+    });
+};
+
+const postcss = require("postcss");
+const parser = require("postcss-selector-parser");
+const selectorProcessor = parser(processor);
+const plugin = postcss.plugin('classValidator', (options) => {
+    return (root) => {
+        let promises = [];
+        root.walkRules(rule => {
+            promises.push(selectorProcessor.process(rule));
+        });
+        return Promise.all(promises);
+    };
+});
+postcss(plugin()).process(`
+.foo-bar {
+  color: red;
+}
+`.trim(), {from: 'test.css'}).catch((e) => console.error(e.toString()));
+
+// CssSyntaxError: classValidator: ./test.css:1:5: classes may not have underscores or dashes in them
+//
+// > 1 | .foo-bar {
+//     |     ^
+//   2 |   color: red;
+//   3 | }
+```
+
+#### Synchronous Error Example
+
+```js
+let processor = (root) => {
+    root.walkClasses((classNode) => {
+        if (/.*[-_]/.test(classNode.value)) {
+            let msg = "classes may not have underscores or dashes in them";
+            throw root.error(msg, {
+                index: classNode.sourceIndex,
+                word: classNode.value
+            });
+        }
+    });
+};
+
+const postcss = require("postcss");
+const parser = require("postcss-selector-parser");
+const selectorProcessor = parser(processor);
+const plugin = postcss.plugin('classValidator', (options) => {
+    return (root) => {
+        root.walkRules(rule => {
+            selectorProcessor.processSync(rule);
+        });
+    };
+});
+postcss(plugin()).process(`
+.foo-bar {
+  color: red;
+}
+`.trim(), {from: 'test.css'}).catch((e) => console.error(e.toString()));
+
+// CssSyntaxError: classValidator: ./test.css:1:5: classes may not have underscores or dashes in them
+//
+// > 1 | .foo-bar {
+//     |     ^
+//   2 |   color: red;
+//   3 | }
+```
Index: frontend/node_modules/postcss-selector-parser/CHANGELOG.md
===================================================================
--- frontend/node_modules/postcss-selector-parser/CHANGELOG.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/CHANGELOG.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,549 @@
+# 6.1.2
+
+- Fixed: erroneous trailing combinators in pseudos
+
+# 6.1.1
+
+- Fixed: improve typings of constructor helpers (#292)
+
+# 6.1.0
+
+- Feature: add `sourceIndex` to `Selector` nodes (#290)
+
+# 6.0.16
+
+- Fixed: add missing `index` argument to `each`/`walk` callback types (#289)
+
+# 6.0.15
+
+- Fixed: Node#prev and Node#next type for the first/last node
+
+# 6.0.14
+
+- Fixed: type definitions
+
+# 6.0.13
+
+- Fixed: throw on unexpected pipe symbols
+
+# 6.0.12
+
+- Fixed: `clone` arguments should be optional
+
+# 6.0.11
+
+- Fixed: parse attribute case insensitivity flag
+
+# 6.0.10
+
+- Fixed: `isPseudoElement()` supports `:first-letter` and `:first-line`
+
+# 6.0.9
+
+- Fixed: `Combinator.raws` property type
+
+# 6.0.8
+
+- Fixed: reduced size
+
+# 6.0.7
+
+- Fixed: parse animation percents
+
+# 6.0.6
+
+- Fixed: parse quoted attributes containing a newline correctly
+
+# 6.0.5
+
+- Perf: rework unesc for a 63+% performance boost
+
+# 6.0.4
+
+- Fixed: ts errors
+
+# 6.0.3
+
+- Fixed: replace node built-in "util" module with "util-deprecate"
+- Fixed: handle uppercase pseudo elements
+- Fixed: do not create invalid combinator before comment
+
+# 6.0.2
+
+- Fixed an issue with parsing and stringifying an empty attribute value
+
+# 6.0.1
+
+- Fixed an issue with unicode surrogate pair parsing
+
+# 6.0.0
+
+- Updated: `cssesc` to 3.0.0 (major)
+- Fixed: Issues with escaped `id` and `class` selectors
+
+# 5.0.0
+
+- Allow escaped dot within class name.
+- Update PostCSS to 7.0.7 (patch)
+
+# 5.0.0-rc.4
+
+- Fixed an issue where comments immediately after an insensitive (in attribute)
+  were not parsed correctly.
+- Updated `cssesc` to 2.0.0 (major).
+- Removed outdated integration tests.
+- Added tests for custom selectors, tags with attributes, the universal
+  selector with pseudos, and tokens after combinators.
+
+# 5.0.0-rc.1
+
+To ease adoption of the v5.0 release, we have relaxed the node version
+check performed by npm at installation time to allow for node 4, which
+remains officially unsupported, but likely to continue working for the
+time being.
+
+# 5.0.0-rc.0
+
+This release has **BREAKING CHANGES** that were required to fix regressions
+in 4.0.0 and to make the Combinator Node API consistent for all combinator
+types. Please read carefully.
+
+## Summary of Changes
+
+* The way a descendent combinator that isn't a single space character (E.g. `.a  .b`) is stored in the AST has changed.
+* Named Combinators (E.g. `.a /for/ .b`) are now properly parsed as a combinator.
+* It is now possible to look up a node based on the source location of a character in that node and to query nodes if they contain some character.
+* Several bug fixes that caused the parser to hang and run out of memory when a `/` was encountered have been fixed.
+* The minimum supported version of Node is now `v6.0.0`.
+
+### Changes to the Descendent Combinator
+
+In prior releases, the value of a descendant combinator with multiple spaces included all the spaces.
+
+* `.a   .b`: Extra spaces are now stored as space before.
+  - Old & Busted:
+    - `combinator.value === "   "`
+  - New hotness:
+    - `combinator.value === " " && combinator.spaces.before === "  "`
+* `.a   /*comment*/.b`: A comment at the end of the combinator causes extra space to become after space.
+  - Old & Busted:
+    - `combinator.value === "   "`
+    - `combinator.raws.value === "   /*comment/"`
+  - New hotness:
+    - `combinator.value === " "`
+    - `combinator.spaces.after === "  "`
+    - `combinator.raws.spaces.after === "  /*comment*/"`
+* `.a<newline>.b`: whitespace that doesn't start or end with a single space character is stored as a raw value.
+  - Old & Busted:
+    - `combinator.value === "\n"`
+    - `combinator.raws.value === undefined`
+  - New hotness:
+    - `combinator.value === " "`
+    - `combinator.raws.value === "\n"`
+
+### Support for "Named Combinators"
+
+Although, nonstandard and unlikely to ever become a standard, combinators like `/deep/` and `/for/` are now properly supported.
+
+Because they've been taken off the standardization track, there is no spec-official name for combinators of the form `/<ident>/`. However, I talked to [Tab Atkins](https://twitter.com/tabatkins) and we agreed to call them "named combinators" so now they are called that.
+
+Before this release such named combinators were parsed without intention and generated three nodes of type `"tag"` where the first and last nodes had a value of `"/"`.
+
+* `.a /for/ .b` is parsed as a combinator.
+  - Old & Busted:
+    - `root.nodes[0].nodes[1].type === "tag"`
+    - `root.nodes[0].nodes[1].value === "/"`
+  - New hotness:
+    - `root.nodes[0].nodes[1].type === "combinator"`
+    - `root.nodes[0].nodes[1].value === "/for/"`
+* `.a /F\6fR/ .b` escapes are handled and uppercase is normalized.
+  - Old & Busted:
+    - `root.nodes[0].nodes[2].type === "tag"`
+    - `root.nodes[0].nodes[2].value === "F\\6fR"`
+  - New hotness:
+    - `root.nodes[0].nodes[1].type === "combinator"`
+    - `root.nodes[0].nodes[1].value === "/for/"`
+    - `root.nodes[0].nodes[1].raws.value === "/F\\6fR/"`
+
+### Source position checks and lookups
+
+A new API was added to look up a node based on the source location.
+
+```js
+const selectorParser = require("postcss-selector-parser");
+// You can find the most specific node for any given character
+let combinator = selectorParser.astSync(".a > .b").atPosition(1,4);
+combinator.toString() === " > ";
+// You can check if a node includes a specific character
+// Whitespace surrounding the node that is owned by that node
+// is included in the check.
+[2,3,4,5,6].map(column => combinator.isAtPosition(1, column));
+// => [false, true, true, true, false]
+```
+
+# 4.0.0
+
+This release has **BREAKING CHANGES** that were required to fix bugs regarding values with escape sequences. Please read carefully.
+
+* **Identifiers with escapes** - CSS escape sequences are now hidden from the public API by default.
+  The normal value of a node like a class name or ID, or an aspect of a node such as attribute
+  selector's value, is unescaped. Escapes representing Non-ascii characters are unescaped into
+  unicode characters. For example: `bu\tton, .\31 00, #i\2764\FE0Fu, [attr="value is \"quoted\""]`
+  will parse respectively to the values `button`, `100`, `i❤️u`, `value is "quoted"`.
+  The original escape sequences for these values can be found in the corresponding property name
+  in `node.raws`. Where possible, deprecation warnings were added, but the nature
+  of escape handling makes it impossible to detect what is escaped or not. Our expectation is
+  that most users are neither expecting nor handling escape sequences in their use of this library,
+  and so for them, this is a bug fix. Users who are taking care to handle escapes correctly can
+  now update their code to remove the escape handling and let us do it for them.
+
+* **Mutating values with escapes** - When you make an update to a node property that has escape handling
+  The value is assumed to be unescaped, and any special characters are escaped automatically and
+  the corresponding `raws` value is immediately updated. This can result in changes to the original
+  escape format. Where the exact value of the escape sequence is important there are methods that
+  allow both values to be set in conjunction. There are a number of new convenience methods for
+  manipulating values that involve escapes, especially for attributes values where the quote mark
+  is involved. See https://github.com/postcss/postcss-selector-parser/pull/133 for an extensive
+  write-up on these changes.
+
+
+**Upgrade/API Example**
+
+In `3.x` there was no unescape handling and internal consistency of several properties was the caller's job to maintain. It was very easy for the developer
+to create a CSS file that did not parse correctly when some types of values
+were in use.
+
+```js
+const selectorParser = require("postcss-selector-parser");
+let attr = selectorParser.attribute({attribute: "id", operator: "=", value: "a-value"});
+attr.value; // => "a-value"
+attr.toString(); // => [id=a-value]
+// Add quotes to an attribute's value.
+// All these values have to be set by the caller to be consistent:
+// no internal consistency is maintained.
+attr.raws.unquoted = attr.value
+attr.value = "'" + attr.value + "'";
+attr.value; // => "'a-value'"
+attr.quoted = true;
+attr.toString();  // => "[id='a-value']"
+```
+
+In `4.0` there is a convenient API for setting and mutating values
+that may need escaping. Especially for attributes.
+
+```js
+const selectorParser = require("postcss-selector-parser");
+
+// The constructor requires you specify the exact escape sequence
+let className = selectorParser.className({value: "illegal class name", raws: {value: "illegal\\ class\\ name"}});
+className.toString(); // => '.illegal\\ class\\ name'
+
+// So it's better to set the value as a property
+className = selectorParser.className();
+// Most properties that deal with identifiers work like this
+className.value = "escape for me";
+className.value; // => 'escape for me'
+className.toString(); // => '.escape\\ for\\ me'
+
+// emoji and all non-ascii are escaped to ensure it works in every css file.
+className.value = "😱🦄😍";
+className.value; // => '😱🦄😍'
+className.toString(); // => '.\\1F631\\1F984\\1F60D'
+
+// you can control the escape sequence if you want, or do bad bad things
+className.setPropertyAndEscape('value', 'xxxx', 'yyyy');
+className.value; // => "xxxx"
+className.toString(); // => ".yyyy"
+
+// Pass a value directly through to the css output without escaping it. 
+className.setPropertyWithoutEscape('value', '$REPLACE_ME$');
+className.value; // => "$REPLACE_ME$"
+className.toString(); // => ".$REPLACE_ME$"
+
+// The biggest changes are to the Attribute class
+// passing quoteMark explicitly is required to avoid a deprecation warning.
+let attr = selectorParser.attribute({attribute: "id", operator: "=", value: "a-value", quoteMark: null});
+attr.toString(); // => "[id=a-value]"
+// Get the value with quotes on it and any necessary escapes.
+// This is the same as reading attr.value in 3.x.
+attr.getQuotedValue(); // => "a-value";
+attr.quoteMark; // => null
+
+// Add quotes to an attribute's value.
+attr.quoteMark = "'"; // This is all that's required.
+attr.toString(); // => "[id='a-value']"
+attr.quoted; // => true
+// The value is still the same, only the quotes have changed.
+attr.value; // => a-value
+attr.getQuotedValue(); // => "'a-value'";
+
+// deprecated assignment, no warning because there's no escapes
+attr.value = "new-value";
+// no quote mark is needed so it is removed
+attr.getQuotedValue(); // => "new-value";
+
+// deprecated assignment, 
+attr.value = "\"a 'single quoted' value\"";
+// > (node:27859) DeprecationWarning: Assigning an attribute a value containing characters that might need to be escaped is deprecated. Call attribute.setValue() instead.
+attr.getQuotedValue(); // => '"a \'single quoted\' value"';
+// quote mark inferred from first and last characters.
+attr.quoteMark; // => '"'
+
+// setValue takes options to make manipulating the value simple.
+attr.setValue('foo', {smart: true});
+// foo doesn't require any escapes or quotes.
+attr.toString(); // => '[id=foo]'
+attr.quoteMark; // => null 
+
+// An explicit quote mark can be specified
+attr.setValue('foo', {quoteMark: '"'});
+attr.toString(); // => '[id="foo"]'
+
+// preserves quote mark by default
+attr.setValue('bar');
+attr.toString(); // => '[id="bar"]'
+attr.quoteMark = null;
+attr.toString(); // => '[id=bar]'
+
+// with no arguments, it preserves quote mark even when it's not a great idea
+attr.setValue('a value \n that should be quoted');
+attr.toString(); // => '[id=a\\ value\\ \\A\\ that\\ should\\ be\\ quoted]'
+
+// smart preservation with a specified default
+attr.setValue('a value \n that should be quoted', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
+// => "[id='a value \\A  that should be quoted']"
+attr.quoteMark = '"';
+// => '[id="a value \\A  that should be quoted"]'
+
+// this keeps double quotes because it wants to quote the value and the existing value has double quotes.
+attr.setValue('this should be quoted', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
+// => '[id="this should be quoted"]'
+
+// picks single quotes because the value has double quotes
+attr.setValue('a "double quoted" value', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
+// => "[id='a "double quoted" value']"
+
+// setPropertyAndEscape lets you do anything you want. Even things that are a bad idea and illegal.
+attr.setPropertyAndEscape('value', 'xxxx', 'the password is 42');
+attr.value; // => "xxxx"
+attr.toString(); // => "[id=the password is 42]"
+
+// Pass a value directly through to the css output without escaping it. 
+attr.setPropertyWithoutEscape('value', '$REPLACEMENT$');
+attr.value; // => "$REPLACEMENT$"
+attr.toString(); // => "[id=$REPLACEMENT$]"
+```
+
+# 3.1.2
+
+* Fix: Removed dot-prop dependency since it's no longer written in es5.
+
+# 3.1.1
+
+* Fix: typescript definitions weren't in the published package.
+
+# 3.1.0
+
+* Fixed numerous bugs in attribute nodes relating to the handling of comments
+  and whitespace. There's significant changes to `attrNode.spaces` and `attrNode.raws` since the `3.0.0` release.
+* Added `Attribute#offsetOf(part)` to get the offset location of
+  attribute parts like `"operator"` and `"value"`. This is most
+  often added to `Attribute#sourceIndex` for error reporting.
+
+# 3.0.0
+
+## Breaking changes
+
+* Some tweaks to the tokenizer/attribute selector parsing mean that whitespace
+  locations might be slightly different to the 2.x code.
+* Better attribute selector parsing with more validation; postcss-selector-parser
+  no longer uses regular expressions to parse attribute selectors.
+* Added an async API (thanks to @jacobp100); the default `process` API is now
+  async, and the sync API is now accessed through `processSync` instead.
+* `process()` and `processSync()` now return a string instead of the Processor
+  instance.
+* Tweaks handling of Less interpolation (thanks to @jwilsson).
+* Removes support for Node 0.12.
+
+## Other changes
+
+* `ast()` and `astSync()` methods have been added to the `Processor`. These
+  return the `Root` node of the selectors after processing them.
+* `transform()` and `transformSync()` methods have been added to the
+  `Processor`. These return the value returned by the processor callback
+  after processing the selectors.
+* Set the parent when inserting a node (thanks to @chriseppstein).
+* Correctly adjust indices when using insertBefore/insertAfter (thanks to @tivac).
+* Fixes handling of namespaces with qualified tag selectors.
+* `process`, `ast` and `transform` (and their sync variants) now accept a
+  `postcss` rule node. When provided, better errors are generated and selector
+  processing is automatically set back to the rule selector (unless the `updateSelector` option is set to `false`.)
+* Now more memory efficient when tokenizing selectors.
+
+### Upgrade hints
+
+The pattern of:
+
+`rule.selector = processor.process(rule.selector).result.toString();`
+
+is now:
+
+`processor.processSync(rule)`
+
+# 2.2.3
+
+* Resolves an issue where the parser would not reduce multiple spaces between an
+  ampersand and another simple selector in lossy mode (thanks to @adam-26).
+
+# 2.2.2
+
+* No longer hangs on an unescaped semicolon; instead the parser will throw
+  an exception for these cases.
+
+# 2.2.1
+
+* Allows a consumer to specify whitespace tokens when creating a new Node
+  (thanks to @Semigradsky).
+
+# 2.2.0
+
+* Added a new option to normalize whitespace when parsing the selector string
+  (thanks to @adam-26).
+
+# 2.1.1
+
+* Better unquoted value handling within attribute selectors
+  (thanks to @evilebottnawi).
+
+# 2.1.0
+
+* Added: Use string constants for all node types & expose them on the main
+  parser instance (thanks to @Aweary).
+
+# 2.0.0
+
+This release contains the following breaking changes:
+
+* Renamed all `eachInside` iterators to `walk`. For example, `eachTag` is now
+  `walkTags`, and `eachInside` is now `walk`.
+* Renamed `Node#removeSelf()` to `Node#remove()`.
+* Renamed `Container#remove()` to `Container#removeChild()`.
+* Renamed `Node#raw` to `Node#raws` (thanks to @davidtheclark).
+* Now parses `&` as the *nesting* selector, rather than a *tag* selector.
+* Fixes misinterpretation of Sass interpolation (e.g. `#{foo}`) as an
+  id selector (thanks to @davidtheclark).
+
+and;
+
+* Fixes parsing of attribute selectors with equals signs in them
+  (e.g. `[data-attr="foo=bar"]`) (thanks to @montmanu).
+* Adds `quoted` and `raw.unquoted` properties to attribute nodes
+  (thanks to @davidtheclark).
+
+# 1.3.3
+
+* Fixes an infinite loop on `)` and `]` tokens when they had no opening pairs.
+  Now postcss-selector-parser will throw when it encounters these lone tokens.
+
+# 1.3.2
+
+* Now uses plain integers rather than `str.charCodeAt(0)` for compiled builds.
+
+# 1.3.1
+
+* Update flatten to v1.x (thanks to @shinnn).
+
+# 1.3.0
+
+* Adds a new node type, `String`, to fix a crash on selectors such as
+  `foo:bar("test")`.
+
+# 1.2.1
+
+* Fixes a crash when the parser encountered a trailing combinator.
+
+# 1.2.0
+
+* A more descriptive error is thrown when the parser expects to find a
+  pseudo-class/pseudo-element (thanks to @ashelley).
+* Adds support for line/column locations for selector nodes, as well as a
+  `Node#sourceIndex` method (thanks to @davidtheclark).
+
+# 1.1.4
+
+* Fixes a crash when a selector started with a `>` combinator. The module will
+  now no longer throw if a selector has a leading/trailing combinator node.
+
+# 1.1.3
+
+* Fixes a crash on `@` tokens.
+
+# 1.1.2
+
+* Fixes an infinite loop caused by using parentheses in a non-pseudo element
+  context.
+
+# 1.1.1
+
+* Fixes a crash when a backslash ended a selector string.
+
+# 1.1.0
+
+* Adds support for replacing multiple nodes at once with `replaceWith`
+  (thanks to @jonathantneal).
+* Parser no longer throws on sequential IDs and trailing commas, to support
+  parsing of selector hacks.
+
+# 1.0.1
+
+* Fixes using `insertAfter` and `insertBefore` during iteration.
+
+# 1.0.0
+
+* Adds `clone` and `replaceWith` methods to nodes.
+* Adds `insertBefore` and `insertAfter` to containers.
+* Stabilises API.
+
+# 0.0.5
+
+* Fixes crash on extra whitespace inside a pseudo selector's parentheses.
+* Adds sort function to the container class.
+* Enables the parser to pass its input through without transforming.
+* Iteration-safe `each` and `eachInside`.
+
+# 0.0.4
+
+* Tidy up redundant duplication.
+* Fixes a bug where the parser would loop infinitely on universal selectors
+  inside pseudo selectors.
+* Adds `length` getter and `eachInside`, `map`, `reduce` to the container class.
+* When a selector has been removed from the tree, the root node will no longer
+  cast it to a string.
+* Adds node type iterators to the container class (e.g. `eachComment`).
+* Adds filter function to the container class.
+* Adds split function to the container class.
+* Create new node types by doing `parser.id(opts)` etc.
+* Adds support for pseudo classes anywhere in the selector.
+
+# 0.0.3
+
+* Adds `next` and `prev` to the node class.
+* Adds `first` and `last` getters to the container class.
+* Adds `every` and `some` iterators to the container class.
+* Add `empty` alias for `removeAll`.
+* Combinators are now types of node.
+* Fixes the at method so that it is not an alias for `index`.
+* Tidy up creation of new nodes in the parser.
+* Refactors how namespaces are handled for consistency & less redundant code.
+* Refactors AST to use `nodes` exclusively, and eliminates excessive nesting.
+* Fixes nested pseudo parsing.
+* Fixes whitespace parsing.
+
+# 0.0.2
+
+* Adds support for namespace selectors.
+* Adds support for selectors joined by escaped spaces - such as `.\31\ 0`.
+
+# 0.0.1
+
+* Initial release.
Index: frontend/node_modules/postcss-selector-parser/LICENSE-MIT
===================================================================
--- frontend/node_modules/postcss-selector-parser/LICENSE-MIT	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/LICENSE-MIT	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,22 @@
+Copyright (c) Ben Briggs <beneb.info@gmail.com> (http://beneb.info)
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
Index: frontend/node_modules/postcss-selector-parser/README.md
===================================================================
--- frontend/node_modules/postcss-selector-parser/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,49 @@
+# postcss-selector-parser [![test](https://github.com/postcss/postcss-selector-parser/actions/workflows/test.yml/badge.svg)](https://github.com/postcss/postcss-selector-parser/actions/workflows/test.yml)
+
+> Selector parser with built in methods for working with selector strings.
+
+## Install
+
+With [npm](https://npmjs.com/package/postcss-selector-parser) do:
+
+```
+npm install postcss-selector-parser
+```
+
+## Quick Start
+
+```js
+const parser = require('postcss-selector-parser');
+const transform = selectors => {
+    selectors.walk(selector => {
+        // do something with the selector
+        console.log(String(selector))
+    });
+};
+
+const transformed = parser(transform).processSync('h1, h2, h3');
+```
+
+To normalize selector whitespace:
+
+```js
+const parser = require('postcss-selector-parser');
+const normalized = parser().processSync('h1, h2, h3', {lossless: false});
+// -> h1,h2,h3
+```
+
+Async support is provided through `parser.process` and will resolve a Promise
+with the resulting selector string.
+
+## API
+
+Please see [API.md](API.md).
+
+## Credits
+
+* Huge thanks to Andrey Sitnik (@ai) for work on PostCSS which helped
+  accelerate this module's development.
+
+## License
+
+MIT
Index: frontend/node_modules/postcss-selector-parser/dist/index.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,17 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _processor = _interopRequireDefault(require("./processor"));
+var selectors = _interopRequireWildcard(require("./selectors"));
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+var parser = function parser(processor) {
+  return new _processor["default"](processor);
+};
+Object.assign(parser, selectors);
+delete parser.__esModule;
+var _default = parser;
+exports["default"] = _default;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/parser.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/parser.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/parser.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1015 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _root = _interopRequireDefault(require("./selectors/root"));
+var _selector = _interopRequireDefault(require("./selectors/selector"));
+var _className = _interopRequireDefault(require("./selectors/className"));
+var _comment = _interopRequireDefault(require("./selectors/comment"));
+var _id = _interopRequireDefault(require("./selectors/id"));
+var _tag = _interopRequireDefault(require("./selectors/tag"));
+var _string = _interopRequireDefault(require("./selectors/string"));
+var _pseudo = _interopRequireDefault(require("./selectors/pseudo"));
+var _attribute = _interopRequireWildcard(require("./selectors/attribute"));
+var _universal = _interopRequireDefault(require("./selectors/universal"));
+var _combinator = _interopRequireDefault(require("./selectors/combinator"));
+var _nesting = _interopRequireDefault(require("./selectors/nesting"));
+var _sortAscending = _interopRequireDefault(require("./sortAscending"));
+var _tokenize = _interopRequireWildcard(require("./tokenize"));
+var tokens = _interopRequireWildcard(require("./tokenTypes"));
+var types = _interopRequireWildcard(require("./selectors/types"));
+var _util = require("./util");
+var _WHITESPACE_TOKENS, _Object$assign;
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+var WHITESPACE_TOKENS = (_WHITESPACE_TOKENS = {}, _WHITESPACE_TOKENS[tokens.space] = true, _WHITESPACE_TOKENS[tokens.cr] = true, _WHITESPACE_TOKENS[tokens.feed] = true, _WHITESPACE_TOKENS[tokens.newline] = true, _WHITESPACE_TOKENS[tokens.tab] = true, _WHITESPACE_TOKENS);
+var WHITESPACE_EQUIV_TOKENS = Object.assign({}, WHITESPACE_TOKENS, (_Object$assign = {}, _Object$assign[tokens.comment] = true, _Object$assign));
+function tokenStart(token) {
+  return {
+    line: token[_tokenize.FIELDS.START_LINE],
+    column: token[_tokenize.FIELDS.START_COL]
+  };
+}
+function tokenEnd(token) {
+  return {
+    line: token[_tokenize.FIELDS.END_LINE],
+    column: token[_tokenize.FIELDS.END_COL]
+  };
+}
+function getSource(startLine, startColumn, endLine, endColumn) {
+  return {
+    start: {
+      line: startLine,
+      column: startColumn
+    },
+    end: {
+      line: endLine,
+      column: endColumn
+    }
+  };
+}
+function getTokenSource(token) {
+  return getSource(token[_tokenize.FIELDS.START_LINE], token[_tokenize.FIELDS.START_COL], token[_tokenize.FIELDS.END_LINE], token[_tokenize.FIELDS.END_COL]);
+}
+function getTokenSourceSpan(startToken, endToken) {
+  if (!startToken) {
+    return undefined;
+  }
+  return getSource(startToken[_tokenize.FIELDS.START_LINE], startToken[_tokenize.FIELDS.START_COL], endToken[_tokenize.FIELDS.END_LINE], endToken[_tokenize.FIELDS.END_COL]);
+}
+function unescapeProp(node, prop) {
+  var value = node[prop];
+  if (typeof value !== "string") {
+    return;
+  }
+  if (value.indexOf("\\") !== -1) {
+    (0, _util.ensureObject)(node, 'raws');
+    node[prop] = (0, _util.unesc)(value);
+    if (node.raws[prop] === undefined) {
+      node.raws[prop] = value;
+    }
+  }
+  return node;
+}
+function indexesOf(array, item) {
+  var i = -1;
+  var indexes = [];
+  while ((i = array.indexOf(item, i + 1)) !== -1) {
+    indexes.push(i);
+  }
+  return indexes;
+}
+function uniqs() {
+  var list = Array.prototype.concat.apply([], arguments);
+  return list.filter(function (item, i) {
+    return i === list.indexOf(item);
+  });
+}
+var Parser = /*#__PURE__*/function () {
+  function Parser(rule, options) {
+    if (options === void 0) {
+      options = {};
+    }
+    this.rule = rule;
+    this.options = Object.assign({
+      lossy: false,
+      safe: false
+    }, options);
+    this.position = 0;
+    this.css = typeof this.rule === 'string' ? this.rule : this.rule.selector;
+    this.tokens = (0, _tokenize["default"])({
+      css: this.css,
+      error: this._errorGenerator(),
+      safe: this.options.safe
+    });
+    var rootSource = getTokenSourceSpan(this.tokens[0], this.tokens[this.tokens.length - 1]);
+    this.root = new _root["default"]({
+      source: rootSource
+    });
+    this.root.errorGenerator = this._errorGenerator();
+    var selector = new _selector["default"]({
+      source: {
+        start: {
+          line: 1,
+          column: 1
+        }
+      },
+      sourceIndex: 0
+    });
+    this.root.append(selector);
+    this.current = selector;
+    this.loop();
+  }
+  var _proto = Parser.prototype;
+  _proto._errorGenerator = function _errorGenerator() {
+    var _this = this;
+    return function (message, errorOptions) {
+      if (typeof _this.rule === 'string') {
+        return new Error(message);
+      }
+      return _this.rule.error(message, errorOptions);
+    };
+  };
+  _proto.attribute = function attribute() {
+    var attr = [];
+    var startingToken = this.currToken;
+    this.position++;
+    while (this.position < this.tokens.length && this.currToken[_tokenize.FIELDS.TYPE] !== tokens.closeSquare) {
+      attr.push(this.currToken);
+      this.position++;
+    }
+    if (this.currToken[_tokenize.FIELDS.TYPE] !== tokens.closeSquare) {
+      return this.expected('closing square bracket', this.currToken[_tokenize.FIELDS.START_POS]);
+    }
+    var len = attr.length;
+    var node = {
+      source: getSource(startingToken[1], startingToken[2], this.currToken[3], this.currToken[4]),
+      sourceIndex: startingToken[_tokenize.FIELDS.START_POS]
+    };
+    if (len === 1 && !~[tokens.word].indexOf(attr[0][_tokenize.FIELDS.TYPE])) {
+      return this.expected('attribute', attr[0][_tokenize.FIELDS.START_POS]);
+    }
+    var pos = 0;
+    var spaceBefore = '';
+    var commentBefore = '';
+    var lastAdded = null;
+    var spaceAfterMeaningfulToken = false;
+    while (pos < len) {
+      var token = attr[pos];
+      var content = this.content(token);
+      var next = attr[pos + 1];
+      switch (token[_tokenize.FIELDS.TYPE]) {
+        case tokens.space:
+          // if (
+          //     len === 1 ||
+          //     pos === 0 && this.content(next) === '|'
+          // ) {
+          //     return this.expected('attribute', token[TOKEN.START_POS], content);
+          // }
+          spaceAfterMeaningfulToken = true;
+          if (this.options.lossy) {
+            break;
+          }
+          if (lastAdded) {
+            (0, _util.ensureObject)(node, 'spaces', lastAdded);
+            var prevContent = node.spaces[lastAdded].after || '';
+            node.spaces[lastAdded].after = prevContent + content;
+            var existingComment = (0, _util.getProp)(node, 'raws', 'spaces', lastAdded, 'after') || null;
+            if (existingComment) {
+              node.raws.spaces[lastAdded].after = existingComment + content;
+            }
+          } else {
+            spaceBefore = spaceBefore + content;
+            commentBefore = commentBefore + content;
+          }
+          break;
+        case tokens.asterisk:
+          if (next[_tokenize.FIELDS.TYPE] === tokens.equals) {
+            node.operator = content;
+            lastAdded = 'operator';
+          } else if ((!node.namespace || lastAdded === "namespace" && !spaceAfterMeaningfulToken) && next) {
+            if (spaceBefore) {
+              (0, _util.ensureObject)(node, 'spaces', 'attribute');
+              node.spaces.attribute.before = spaceBefore;
+              spaceBefore = '';
+            }
+            if (commentBefore) {
+              (0, _util.ensureObject)(node, 'raws', 'spaces', 'attribute');
+              node.raws.spaces.attribute.before = spaceBefore;
+              commentBefore = '';
+            }
+            node.namespace = (node.namespace || "") + content;
+            var rawValue = (0, _util.getProp)(node, 'raws', 'namespace') || null;
+            if (rawValue) {
+              node.raws.namespace += content;
+            }
+            lastAdded = 'namespace';
+          }
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.dollar:
+          if (lastAdded === "value") {
+            var oldRawValue = (0, _util.getProp)(node, 'raws', 'value');
+            node.value += "$";
+            if (oldRawValue) {
+              node.raws.value = oldRawValue + "$";
+            }
+            break;
+          }
+        // Falls through
+        case tokens.caret:
+          if (next[_tokenize.FIELDS.TYPE] === tokens.equals) {
+            node.operator = content;
+            lastAdded = 'operator';
+          }
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.combinator:
+          if (content === '~' && next[_tokenize.FIELDS.TYPE] === tokens.equals) {
+            node.operator = content;
+            lastAdded = 'operator';
+          }
+          if (content !== '|') {
+            spaceAfterMeaningfulToken = false;
+            break;
+          }
+          if (next[_tokenize.FIELDS.TYPE] === tokens.equals) {
+            node.operator = content;
+            lastAdded = 'operator';
+          } else if (!node.namespace && !node.attribute) {
+            node.namespace = true;
+          }
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.word:
+          if (next && this.content(next) === '|' && attr[pos + 2] && attr[pos + 2][_tokenize.FIELDS.TYPE] !== tokens.equals &&
+          // this look-ahead probably fails with comment nodes involved.
+          !node.operator && !node.namespace) {
+            node.namespace = content;
+            lastAdded = 'namespace';
+          } else if (!node.attribute || lastAdded === "attribute" && !spaceAfterMeaningfulToken) {
+            if (spaceBefore) {
+              (0, _util.ensureObject)(node, 'spaces', 'attribute');
+              node.spaces.attribute.before = spaceBefore;
+              spaceBefore = '';
+            }
+            if (commentBefore) {
+              (0, _util.ensureObject)(node, 'raws', 'spaces', 'attribute');
+              node.raws.spaces.attribute.before = commentBefore;
+              commentBefore = '';
+            }
+            node.attribute = (node.attribute || "") + content;
+            var _rawValue = (0, _util.getProp)(node, 'raws', 'attribute') || null;
+            if (_rawValue) {
+              node.raws.attribute += content;
+            }
+            lastAdded = 'attribute';
+          } else if (!node.value && node.value !== "" || lastAdded === "value" && !(spaceAfterMeaningfulToken || node.quoteMark)) {
+            var _unescaped = (0, _util.unesc)(content);
+            var _oldRawValue = (0, _util.getProp)(node, 'raws', 'value') || '';
+            var oldValue = node.value || '';
+            node.value = oldValue + _unescaped;
+            node.quoteMark = null;
+            if (_unescaped !== content || _oldRawValue) {
+              (0, _util.ensureObject)(node, 'raws');
+              node.raws.value = (_oldRawValue || oldValue) + content;
+            }
+            lastAdded = 'value';
+          } else {
+            var insensitive = content === 'i' || content === "I";
+            if ((node.value || node.value === '') && (node.quoteMark || spaceAfterMeaningfulToken)) {
+              node.insensitive = insensitive;
+              if (!insensitive || content === "I") {
+                (0, _util.ensureObject)(node, 'raws');
+                node.raws.insensitiveFlag = content;
+              }
+              lastAdded = 'insensitive';
+              if (spaceBefore) {
+                (0, _util.ensureObject)(node, 'spaces', 'insensitive');
+                node.spaces.insensitive.before = spaceBefore;
+                spaceBefore = '';
+              }
+              if (commentBefore) {
+                (0, _util.ensureObject)(node, 'raws', 'spaces', 'insensitive');
+                node.raws.spaces.insensitive.before = commentBefore;
+                commentBefore = '';
+              }
+            } else if (node.value || node.value === '') {
+              lastAdded = 'value';
+              node.value += content;
+              if (node.raws.value) {
+                node.raws.value += content;
+              }
+            }
+          }
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.str:
+          if (!node.attribute || !node.operator) {
+            return this.error("Expected an attribute followed by an operator preceding the string.", {
+              index: token[_tokenize.FIELDS.START_POS]
+            });
+          }
+          var _unescapeValue = (0, _attribute.unescapeValue)(content),
+            unescaped = _unescapeValue.unescaped,
+            quoteMark = _unescapeValue.quoteMark;
+          node.value = unescaped;
+          node.quoteMark = quoteMark;
+          lastAdded = 'value';
+          (0, _util.ensureObject)(node, 'raws');
+          node.raws.value = content;
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.equals:
+          if (!node.attribute) {
+            return this.expected('attribute', token[_tokenize.FIELDS.START_POS], content);
+          }
+          if (node.value) {
+            return this.error('Unexpected "=" found; an operator was already defined.', {
+              index: token[_tokenize.FIELDS.START_POS]
+            });
+          }
+          node.operator = node.operator ? node.operator + content : content;
+          lastAdded = 'operator';
+          spaceAfterMeaningfulToken = false;
+          break;
+        case tokens.comment:
+          if (lastAdded) {
+            if (spaceAfterMeaningfulToken || next && next[_tokenize.FIELDS.TYPE] === tokens.space || lastAdded === 'insensitive') {
+              var lastComment = (0, _util.getProp)(node, 'spaces', lastAdded, 'after') || '';
+              var rawLastComment = (0, _util.getProp)(node, 'raws', 'spaces', lastAdded, 'after') || lastComment;
+              (0, _util.ensureObject)(node, 'raws', 'spaces', lastAdded);
+              node.raws.spaces[lastAdded].after = rawLastComment + content;
+            } else {
+              var lastValue = node[lastAdded] || '';
+              var rawLastValue = (0, _util.getProp)(node, 'raws', lastAdded) || lastValue;
+              (0, _util.ensureObject)(node, 'raws');
+              node.raws[lastAdded] = rawLastValue + content;
+            }
+          } else {
+            commentBefore = commentBefore + content;
+          }
+          break;
+        default:
+          return this.error("Unexpected \"" + content + "\" found.", {
+            index: token[_tokenize.FIELDS.START_POS]
+          });
+      }
+      pos++;
+    }
+    unescapeProp(node, "attribute");
+    unescapeProp(node, "namespace");
+    this.newNode(new _attribute["default"](node));
+    this.position++;
+  }
+
+  /**
+   * return a node containing meaningless garbage up to (but not including) the specified token position.
+   * if the token position is negative, all remaining tokens are consumed.
+   *
+   * This returns an array containing a single string node if all whitespace,
+   * otherwise an array of comment nodes with space before and after.
+   *
+   * These tokens are not added to the current selector, the caller can add them or use them to amend
+   * a previous node's space metadata.
+   *
+   * In lossy mode, this returns only comments.
+   */;
+  _proto.parseWhitespaceEquivalentTokens = function parseWhitespaceEquivalentTokens(stopPosition) {
+    if (stopPosition < 0) {
+      stopPosition = this.tokens.length;
+    }
+    var startPosition = this.position;
+    var nodes = [];
+    var space = "";
+    var lastComment = undefined;
+    do {
+      if (WHITESPACE_TOKENS[this.currToken[_tokenize.FIELDS.TYPE]]) {
+        if (!this.options.lossy) {
+          space += this.content();
+        }
+      } else if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.comment) {
+        var spaces = {};
+        if (space) {
+          spaces.before = space;
+          space = "";
+        }
+        lastComment = new _comment["default"]({
+          value: this.content(),
+          source: getTokenSource(this.currToken),
+          sourceIndex: this.currToken[_tokenize.FIELDS.START_POS],
+          spaces: spaces
+        });
+        nodes.push(lastComment);
+      }
+    } while (++this.position < stopPosition);
+    if (space) {
+      if (lastComment) {
+        lastComment.spaces.after = space;
+      } else if (!this.options.lossy) {
+        var firstToken = this.tokens[startPosition];
+        var lastToken = this.tokens[this.position - 1];
+        nodes.push(new _string["default"]({
+          value: '',
+          source: getSource(firstToken[_tokenize.FIELDS.START_LINE], firstToken[_tokenize.FIELDS.START_COL], lastToken[_tokenize.FIELDS.END_LINE], lastToken[_tokenize.FIELDS.END_COL]),
+          sourceIndex: firstToken[_tokenize.FIELDS.START_POS],
+          spaces: {
+            before: space,
+            after: ''
+          }
+        }));
+      }
+    }
+    return nodes;
+  }
+
+  /**
+   *
+   * @param {*} nodes
+   */;
+  _proto.convertWhitespaceNodesToSpace = function convertWhitespaceNodesToSpace(nodes, requiredSpace) {
+    var _this2 = this;
+    if (requiredSpace === void 0) {
+      requiredSpace = false;
+    }
+    var space = "";
+    var rawSpace = "";
+    nodes.forEach(function (n) {
+      var spaceBefore = _this2.lossySpace(n.spaces.before, requiredSpace);
+      var rawSpaceBefore = _this2.lossySpace(n.rawSpaceBefore, requiredSpace);
+      space += spaceBefore + _this2.lossySpace(n.spaces.after, requiredSpace && spaceBefore.length === 0);
+      rawSpace += spaceBefore + n.value + _this2.lossySpace(n.rawSpaceAfter, requiredSpace && rawSpaceBefore.length === 0);
+    });
+    if (rawSpace === space) {
+      rawSpace = undefined;
+    }
+    var result = {
+      space: space,
+      rawSpace: rawSpace
+    };
+    return result;
+  };
+  _proto.isNamedCombinator = function isNamedCombinator(position) {
+    if (position === void 0) {
+      position = this.position;
+    }
+    return this.tokens[position + 0] && this.tokens[position + 0][_tokenize.FIELDS.TYPE] === tokens.slash && this.tokens[position + 1] && this.tokens[position + 1][_tokenize.FIELDS.TYPE] === tokens.word && this.tokens[position + 2] && this.tokens[position + 2][_tokenize.FIELDS.TYPE] === tokens.slash;
+  };
+  _proto.namedCombinator = function namedCombinator() {
+    if (this.isNamedCombinator()) {
+      var nameRaw = this.content(this.tokens[this.position + 1]);
+      var name = (0, _util.unesc)(nameRaw).toLowerCase();
+      var raws = {};
+      if (name !== nameRaw) {
+        raws.value = "/" + nameRaw + "/";
+      }
+      var node = new _combinator["default"]({
+        value: "/" + name + "/",
+        source: getSource(this.currToken[_tokenize.FIELDS.START_LINE], this.currToken[_tokenize.FIELDS.START_COL], this.tokens[this.position + 2][_tokenize.FIELDS.END_LINE], this.tokens[this.position + 2][_tokenize.FIELDS.END_COL]),
+        sourceIndex: this.currToken[_tokenize.FIELDS.START_POS],
+        raws: raws
+      });
+      this.position = this.position + 3;
+      return node;
+    } else {
+      this.unexpected();
+    }
+  };
+  _proto.combinator = function combinator() {
+    var _this3 = this;
+    if (this.content() === '|') {
+      return this.namespace();
+    }
+    // We need to decide between a space that's a descendant combinator and meaningless whitespace at the end of a selector.
+    var nextSigTokenPos = this.locateNextMeaningfulToken(this.position);
+    if (nextSigTokenPos < 0 || this.tokens[nextSigTokenPos][_tokenize.FIELDS.TYPE] === tokens.comma || this.tokens[nextSigTokenPos][_tokenize.FIELDS.TYPE] === tokens.closeParenthesis) {
+      var nodes = this.parseWhitespaceEquivalentTokens(nextSigTokenPos);
+      if (nodes.length > 0) {
+        var last = this.current.last;
+        if (last) {
+          var _this$convertWhitespa = this.convertWhitespaceNodesToSpace(nodes),
+            space = _this$convertWhitespa.space,
+            rawSpace = _this$convertWhitespa.rawSpace;
+          if (rawSpace !== undefined) {
+            last.rawSpaceAfter += rawSpace;
+          }
+          last.spaces.after += space;
+        } else {
+          nodes.forEach(function (n) {
+            return _this3.newNode(n);
+          });
+        }
+      }
+      return;
+    }
+    var firstToken = this.currToken;
+    var spaceOrDescendantSelectorNodes = undefined;
+    if (nextSigTokenPos > this.position) {
+      spaceOrDescendantSelectorNodes = this.parseWhitespaceEquivalentTokens(nextSigTokenPos);
+    }
+    var node;
+    if (this.isNamedCombinator()) {
+      node = this.namedCombinator();
+    } else if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.combinator) {
+      node = new _combinator["default"]({
+        value: this.content(),
+        source: getTokenSource(this.currToken),
+        sourceIndex: this.currToken[_tokenize.FIELDS.START_POS]
+      });
+      this.position++;
+    } else if (WHITESPACE_TOKENS[this.currToken[_tokenize.FIELDS.TYPE]]) {
+      // pass
+    } else if (!spaceOrDescendantSelectorNodes) {
+      this.unexpected();
+    }
+    if (node) {
+      if (spaceOrDescendantSelectorNodes) {
+        var _this$convertWhitespa2 = this.convertWhitespaceNodesToSpace(spaceOrDescendantSelectorNodes),
+          _space = _this$convertWhitespa2.space,
+          _rawSpace = _this$convertWhitespa2.rawSpace;
+        node.spaces.before = _space;
+        node.rawSpaceBefore = _rawSpace;
+      }
+    } else {
+      // descendant combinator
+      var _this$convertWhitespa3 = this.convertWhitespaceNodesToSpace(spaceOrDescendantSelectorNodes, true),
+        _space2 = _this$convertWhitespa3.space,
+        _rawSpace2 = _this$convertWhitespa3.rawSpace;
+      if (!_rawSpace2) {
+        _rawSpace2 = _space2;
+      }
+      var spaces = {};
+      var raws = {
+        spaces: {}
+      };
+      if (_space2.endsWith(' ') && _rawSpace2.endsWith(' ')) {
+        spaces.before = _space2.slice(0, _space2.length - 1);
+        raws.spaces.before = _rawSpace2.slice(0, _rawSpace2.length - 1);
+      } else if (_space2.startsWith(' ') && _rawSpace2.startsWith(' ')) {
+        spaces.after = _space2.slice(1);
+        raws.spaces.after = _rawSpace2.slice(1);
+      } else {
+        raws.value = _rawSpace2;
+      }
+      node = new _combinator["default"]({
+        value: ' ',
+        source: getTokenSourceSpan(firstToken, this.tokens[this.position - 1]),
+        sourceIndex: firstToken[_tokenize.FIELDS.START_POS],
+        spaces: spaces,
+        raws: raws
+      });
+    }
+    if (this.currToken && this.currToken[_tokenize.FIELDS.TYPE] === tokens.space) {
+      node.spaces.after = this.optionalSpace(this.content());
+      this.position++;
+    }
+    return this.newNode(node);
+  };
+  _proto.comma = function comma() {
+    if (this.position === this.tokens.length - 1) {
+      this.root.trailingComma = true;
+      this.position++;
+      return;
+    }
+    this.current._inferEndPosition();
+    var selector = new _selector["default"]({
+      source: {
+        start: tokenStart(this.tokens[this.position + 1])
+      },
+      sourceIndex: this.tokens[this.position + 1][_tokenize.FIELDS.START_POS]
+    });
+    this.current.parent.append(selector);
+    this.current = selector;
+    this.position++;
+  };
+  _proto.comment = function comment() {
+    var current = this.currToken;
+    this.newNode(new _comment["default"]({
+      value: this.content(),
+      source: getTokenSource(current),
+      sourceIndex: current[_tokenize.FIELDS.START_POS]
+    }));
+    this.position++;
+  };
+  _proto.error = function error(message, opts) {
+    throw this.root.error(message, opts);
+  };
+  _proto.missingBackslash = function missingBackslash() {
+    return this.error('Expected a backslash preceding the semicolon.', {
+      index: this.currToken[_tokenize.FIELDS.START_POS]
+    });
+  };
+  _proto.missingParenthesis = function missingParenthesis() {
+    return this.expected('opening parenthesis', this.currToken[_tokenize.FIELDS.START_POS]);
+  };
+  _proto.missingSquareBracket = function missingSquareBracket() {
+    return this.expected('opening square bracket', this.currToken[_tokenize.FIELDS.START_POS]);
+  };
+  _proto.unexpected = function unexpected() {
+    return this.error("Unexpected '" + this.content() + "'. Escaping special characters with \\ may help.", this.currToken[_tokenize.FIELDS.START_POS]);
+  };
+  _proto.unexpectedPipe = function unexpectedPipe() {
+    return this.error("Unexpected '|'.", this.currToken[_tokenize.FIELDS.START_POS]);
+  };
+  _proto.namespace = function namespace() {
+    var before = this.prevToken && this.content(this.prevToken) || true;
+    if (this.nextToken[_tokenize.FIELDS.TYPE] === tokens.word) {
+      this.position++;
+      return this.word(before);
+    } else if (this.nextToken[_tokenize.FIELDS.TYPE] === tokens.asterisk) {
+      this.position++;
+      return this.universal(before);
+    }
+    this.unexpectedPipe();
+  };
+  _proto.nesting = function nesting() {
+    if (this.nextToken) {
+      var nextContent = this.content(this.nextToken);
+      if (nextContent === "|") {
+        this.position++;
+        return;
+      }
+    }
+    var current = this.currToken;
+    this.newNode(new _nesting["default"]({
+      value: this.content(),
+      source: getTokenSource(current),
+      sourceIndex: current[_tokenize.FIELDS.START_POS]
+    }));
+    this.position++;
+  };
+  _proto.parentheses = function parentheses() {
+    var last = this.current.last;
+    var unbalanced = 1;
+    this.position++;
+    if (last && last.type === types.PSEUDO) {
+      var selector = new _selector["default"]({
+        source: {
+          start: tokenStart(this.tokens[this.position])
+        },
+        sourceIndex: this.tokens[this.position][_tokenize.FIELDS.START_POS]
+      });
+      var cache = this.current;
+      last.append(selector);
+      this.current = selector;
+      while (this.position < this.tokens.length && unbalanced) {
+        if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.openParenthesis) {
+          unbalanced++;
+        }
+        if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.closeParenthesis) {
+          unbalanced--;
+        }
+        if (unbalanced) {
+          this.parse();
+        } else {
+          this.current.source.end = tokenEnd(this.currToken);
+          this.current.parent.source.end = tokenEnd(this.currToken);
+          this.position++;
+        }
+      }
+      this.current = cache;
+    } else {
+      // I think this case should be an error. It's used to implement a basic parse of media queries
+      // but I don't think it's a good idea.
+      var parenStart = this.currToken;
+      var parenValue = "(";
+      var parenEnd;
+      while (this.position < this.tokens.length && unbalanced) {
+        if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.openParenthesis) {
+          unbalanced++;
+        }
+        if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.closeParenthesis) {
+          unbalanced--;
+        }
+        parenEnd = this.currToken;
+        parenValue += this.parseParenthesisToken(this.currToken);
+        this.position++;
+      }
+      if (last) {
+        last.appendToPropertyAndEscape("value", parenValue, parenValue);
+      } else {
+        this.newNode(new _string["default"]({
+          value: parenValue,
+          source: getSource(parenStart[_tokenize.FIELDS.START_LINE], parenStart[_tokenize.FIELDS.START_COL], parenEnd[_tokenize.FIELDS.END_LINE], parenEnd[_tokenize.FIELDS.END_COL]),
+          sourceIndex: parenStart[_tokenize.FIELDS.START_POS]
+        }));
+      }
+    }
+    if (unbalanced) {
+      return this.expected('closing parenthesis', this.currToken[_tokenize.FIELDS.START_POS]);
+    }
+  };
+  _proto.pseudo = function pseudo() {
+    var _this4 = this;
+    var pseudoStr = '';
+    var startingToken = this.currToken;
+    while (this.currToken && this.currToken[_tokenize.FIELDS.TYPE] === tokens.colon) {
+      pseudoStr += this.content();
+      this.position++;
+    }
+    if (!this.currToken) {
+      return this.expected(['pseudo-class', 'pseudo-element'], this.position - 1);
+    }
+    if (this.currToken[_tokenize.FIELDS.TYPE] === tokens.word) {
+      this.splitWord(false, function (first, length) {
+        pseudoStr += first;
+        _this4.newNode(new _pseudo["default"]({
+          value: pseudoStr,
+          source: getTokenSourceSpan(startingToken, _this4.currToken),
+          sourceIndex: startingToken[_tokenize.FIELDS.START_POS]
+        }));
+        if (length > 1 && _this4.nextToken && _this4.nextToken[_tokenize.FIELDS.TYPE] === tokens.openParenthesis) {
+          _this4.error('Misplaced parenthesis.', {
+            index: _this4.nextToken[_tokenize.FIELDS.START_POS]
+          });
+        }
+      });
+    } else {
+      return this.expected(['pseudo-class', 'pseudo-element'], this.currToken[_tokenize.FIELDS.START_POS]);
+    }
+  };
+  _proto.space = function space() {
+    var content = this.content();
+    // Handle space before and after the selector
+    if (this.position === 0 || this.prevToken[_tokenize.FIELDS.TYPE] === tokens.comma || this.prevToken[_tokenize.FIELDS.TYPE] === tokens.openParenthesis || this.current.nodes.every(function (node) {
+      return node.type === 'comment';
+    })) {
+      this.spaces = this.optionalSpace(content);
+      this.position++;
+    } else if (this.position === this.tokens.length - 1 || this.nextToken[_tokenize.FIELDS.TYPE] === tokens.comma || this.nextToken[_tokenize.FIELDS.TYPE] === tokens.closeParenthesis) {
+      this.current.last.spaces.after = this.optionalSpace(content);
+      this.position++;
+    } else {
+      this.combinator();
+    }
+  };
+  _proto.string = function string() {
+    var current = this.currToken;
+    this.newNode(new _string["default"]({
+      value: this.content(),
+      source: getTokenSource(current),
+      sourceIndex: current[_tokenize.FIELDS.START_POS]
+    }));
+    this.position++;
+  };
+  _proto.universal = function universal(namespace) {
+    var nextToken = this.nextToken;
+    if (nextToken && this.content(nextToken) === '|') {
+      this.position++;
+      return this.namespace();
+    }
+    var current = this.currToken;
+    this.newNode(new _universal["default"]({
+      value: this.content(),
+      source: getTokenSource(current),
+      sourceIndex: current[_tokenize.FIELDS.START_POS]
+    }), namespace);
+    this.position++;
+  };
+  _proto.splitWord = function splitWord(namespace, firstCallback) {
+    var _this5 = this;
+    var nextToken = this.nextToken;
+    var word = this.content();
+    while (nextToken && ~[tokens.dollar, tokens.caret, tokens.equals, tokens.word].indexOf(nextToken[_tokenize.FIELDS.TYPE])) {
+      this.position++;
+      var current = this.content();
+      word += current;
+      if (current.lastIndexOf('\\') === current.length - 1) {
+        var next = this.nextToken;
+        if (next && next[_tokenize.FIELDS.TYPE] === tokens.space) {
+          word += this.requiredSpace(this.content(next));
+          this.position++;
+        }
+      }
+      nextToken = this.nextToken;
+    }
+    var hasClass = indexesOf(word, '.').filter(function (i) {
+      // Allow escaped dot within class name
+      var escapedDot = word[i - 1] === '\\';
+      // Allow decimal numbers percent in @keyframes
+      var isKeyframesPercent = /^\d+\.\d+%$/.test(word);
+      return !escapedDot && !isKeyframesPercent;
+    });
+    var hasId = indexesOf(word, '#').filter(function (i) {
+      return word[i - 1] !== '\\';
+    });
+    // Eliminate Sass interpolations from the list of id indexes
+    var interpolations = indexesOf(word, '#{');
+    if (interpolations.length) {
+      hasId = hasId.filter(function (hashIndex) {
+        return !~interpolations.indexOf(hashIndex);
+      });
+    }
+    var indices = (0, _sortAscending["default"])(uniqs([0].concat(hasClass, hasId)));
+    indices.forEach(function (ind, i) {
+      var index = indices[i + 1] || word.length;
+      var value = word.slice(ind, index);
+      if (i === 0 && firstCallback) {
+        return firstCallback.call(_this5, value, indices.length);
+      }
+      var node;
+      var current = _this5.currToken;
+      var sourceIndex = current[_tokenize.FIELDS.START_POS] + indices[i];
+      var source = getSource(current[1], current[2] + ind, current[3], current[2] + (index - 1));
+      if (~hasClass.indexOf(ind)) {
+        var classNameOpts = {
+          value: value.slice(1),
+          source: source,
+          sourceIndex: sourceIndex
+        };
+        node = new _className["default"](unescapeProp(classNameOpts, "value"));
+      } else if (~hasId.indexOf(ind)) {
+        var idOpts = {
+          value: value.slice(1),
+          source: source,
+          sourceIndex: sourceIndex
+        };
+        node = new _id["default"](unescapeProp(idOpts, "value"));
+      } else {
+        var tagOpts = {
+          value: value,
+          source: source,
+          sourceIndex: sourceIndex
+        };
+        unescapeProp(tagOpts, "value");
+        node = new _tag["default"](tagOpts);
+      }
+      _this5.newNode(node, namespace);
+      // Ensure that the namespace is used only once
+      namespace = null;
+    });
+    this.position++;
+  };
+  _proto.word = function word(namespace) {
+    var nextToken = this.nextToken;
+    if (nextToken && this.content(nextToken) === '|') {
+      this.position++;
+      return this.namespace();
+    }
+    return this.splitWord(namespace);
+  };
+  _proto.loop = function loop() {
+    while (this.position < this.tokens.length) {
+      this.parse(true);
+    }
+    this.current._inferEndPosition();
+    return this.root;
+  };
+  _proto.parse = function parse(throwOnParenthesis) {
+    switch (this.currToken[_tokenize.FIELDS.TYPE]) {
+      case tokens.space:
+        this.space();
+        break;
+      case tokens.comment:
+        this.comment();
+        break;
+      case tokens.openParenthesis:
+        this.parentheses();
+        break;
+      case tokens.closeParenthesis:
+        if (throwOnParenthesis) {
+          this.missingParenthesis();
+        }
+        break;
+      case tokens.openSquare:
+        this.attribute();
+        break;
+      case tokens.dollar:
+      case tokens.caret:
+      case tokens.equals:
+      case tokens.word:
+        this.word();
+        break;
+      case tokens.colon:
+        this.pseudo();
+        break;
+      case tokens.comma:
+        this.comma();
+        break;
+      case tokens.asterisk:
+        this.universal();
+        break;
+      case tokens.ampersand:
+        this.nesting();
+        break;
+      case tokens.slash:
+      case tokens.combinator:
+        this.combinator();
+        break;
+      case tokens.str:
+        this.string();
+        break;
+      // These cases throw; no break needed.
+      case tokens.closeSquare:
+        this.missingSquareBracket();
+      case tokens.semicolon:
+        this.missingBackslash();
+      default:
+        this.unexpected();
+    }
+  }
+
+  /**
+   * Helpers
+   */;
+  _proto.expected = function expected(description, index, found) {
+    if (Array.isArray(description)) {
+      var last = description.pop();
+      description = description.join(', ') + " or " + last;
+    }
+    var an = /^[aeiou]/.test(description[0]) ? 'an' : 'a';
+    if (!found) {
+      return this.error("Expected " + an + " " + description + ".", {
+        index: index
+      });
+    }
+    return this.error("Expected " + an + " " + description + ", found \"" + found + "\" instead.", {
+      index: index
+    });
+  };
+  _proto.requiredSpace = function requiredSpace(space) {
+    return this.options.lossy ? ' ' : space;
+  };
+  _proto.optionalSpace = function optionalSpace(space) {
+    return this.options.lossy ? '' : space;
+  };
+  _proto.lossySpace = function lossySpace(space, required) {
+    if (this.options.lossy) {
+      return required ? ' ' : '';
+    } else {
+      return space;
+    }
+  };
+  _proto.parseParenthesisToken = function parseParenthesisToken(token) {
+    var content = this.content(token);
+    if (token[_tokenize.FIELDS.TYPE] === tokens.space) {
+      return this.requiredSpace(content);
+    } else {
+      return content;
+    }
+  };
+  _proto.newNode = function newNode(node, namespace) {
+    if (namespace) {
+      if (/^ +$/.test(namespace)) {
+        if (!this.options.lossy) {
+          this.spaces = (this.spaces || '') + namespace;
+        }
+        namespace = true;
+      }
+      node.namespace = namespace;
+      unescapeProp(node, "namespace");
+    }
+    if (this.spaces) {
+      node.spaces.before = this.spaces;
+      this.spaces = '';
+    }
+    return this.current.append(node);
+  };
+  _proto.content = function content(token) {
+    if (token === void 0) {
+      token = this.currToken;
+    }
+    return this.css.slice(token[_tokenize.FIELDS.START_POS], token[_tokenize.FIELDS.END_POS]);
+  };
+  /**
+   * returns the index of the next non-whitespace, non-comment token.
+   * returns -1 if no meaningful token is found.
+   */
+  _proto.locateNextMeaningfulToken = function locateNextMeaningfulToken(startPosition) {
+    if (startPosition === void 0) {
+      startPosition = this.position + 1;
+    }
+    var searchPosition = startPosition;
+    while (searchPosition < this.tokens.length) {
+      if (WHITESPACE_EQUIV_TOKENS[this.tokens[searchPosition][_tokenize.FIELDS.TYPE]]) {
+        searchPosition++;
+        continue;
+      } else {
+        return searchPosition;
+      }
+    }
+    return -1;
+  };
+  _createClass(Parser, [{
+    key: "currToken",
+    get: function get() {
+      return this.tokens[this.position];
+    }
+  }, {
+    key: "nextToken",
+    get: function get() {
+      return this.tokens[this.position + 1];
+    }
+  }, {
+    key: "prevToken",
+    get: function get() {
+      return this.tokens[this.position - 1];
+    }
+  }]);
+  return Parser;
+}();
+exports["default"] = Parser;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/processor.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/processor.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/processor.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,170 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _parser = _interopRequireDefault(require("./parser"));
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+var Processor = /*#__PURE__*/function () {
+  function Processor(func, options) {
+    this.func = func || function noop() {};
+    this.funcRes = null;
+    this.options = options;
+  }
+  var _proto = Processor.prototype;
+  _proto._shouldUpdateSelector = function _shouldUpdateSelector(rule, options) {
+    if (options === void 0) {
+      options = {};
+    }
+    var merged = Object.assign({}, this.options, options);
+    if (merged.updateSelector === false) {
+      return false;
+    } else {
+      return typeof rule !== "string";
+    }
+  };
+  _proto._isLossy = function _isLossy(options) {
+    if (options === void 0) {
+      options = {};
+    }
+    var merged = Object.assign({}, this.options, options);
+    if (merged.lossless === false) {
+      return true;
+    } else {
+      return false;
+    }
+  };
+  _proto._root = function _root(rule, options) {
+    if (options === void 0) {
+      options = {};
+    }
+    var parser = new _parser["default"](rule, this._parseOptions(options));
+    return parser.root;
+  };
+  _proto._parseOptions = function _parseOptions(options) {
+    return {
+      lossy: this._isLossy(options)
+    };
+  };
+  _proto._run = function _run(rule, options) {
+    var _this = this;
+    if (options === void 0) {
+      options = {};
+    }
+    return new Promise(function (resolve, reject) {
+      try {
+        var root = _this._root(rule, options);
+        Promise.resolve(_this.func(root)).then(function (transform) {
+          var string = undefined;
+          if (_this._shouldUpdateSelector(rule, options)) {
+            string = root.toString();
+            rule.selector = string;
+          }
+          return {
+            transform: transform,
+            root: root,
+            string: string
+          };
+        }).then(resolve, reject);
+      } catch (e) {
+        reject(e);
+        return;
+      }
+    });
+  };
+  _proto._runSync = function _runSync(rule, options) {
+    if (options === void 0) {
+      options = {};
+    }
+    var root = this._root(rule, options);
+    var transform = this.func(root);
+    if (transform && typeof transform.then === "function") {
+      throw new Error("Selector processor returned a promise to a synchronous call.");
+    }
+    var string = undefined;
+    if (options.updateSelector && typeof rule !== "string") {
+      string = root.toString();
+      rule.selector = string;
+    }
+    return {
+      transform: transform,
+      root: root,
+      string: string
+    };
+  }
+
+  /**
+   * Process rule into a selector AST.
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {Promise<parser.Root>} The AST of the selector after processing it.
+   */;
+  _proto.ast = function ast(rule, options) {
+    return this._run(rule, options).then(function (result) {
+      return result.root;
+    });
+  }
+
+  /**
+   * Process rule into a selector AST synchronously.
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {parser.Root} The AST of the selector after processing it.
+   */;
+  _proto.astSync = function astSync(rule, options) {
+    return this._runSync(rule, options).root;
+  }
+
+  /**
+   * Process a selector into a transformed value asynchronously
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {Promise<any>} The value returned by the processor.
+   */;
+  _proto.transform = function transform(rule, options) {
+    return this._run(rule, options).then(function (result) {
+      return result.transform;
+    });
+  }
+
+  /**
+   * Process a selector into a transformed value synchronously.
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {any} The value returned by the processor.
+   */;
+  _proto.transformSync = function transformSync(rule, options) {
+    return this._runSync(rule, options).transform;
+  }
+
+  /**
+   * Process a selector into a new selector string asynchronously.
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {string} the selector after processing.
+   */;
+  _proto.process = function process(rule, options) {
+    return this._run(rule, options).then(function (result) {
+      return result.string || result.root.toString();
+    });
+  }
+
+  /**
+   * Process a selector into a new selector string synchronously.
+   *
+   * @param rule {postcss.Rule | string} The css selector to be processed
+   * @param options The options for processing
+   * @returns {string} the selector after processing.
+   */;
+  _proto.processSync = function processSync(rule, options) {
+    var result = this._runSync(rule, options);
+    return result.string || result.root.toString();
+  };
+  return Processor;
+}();
+exports["default"] = Processor;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/attribute.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/attribute.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/attribute.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,448 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+exports.unescapeValue = unescapeValue;
+var _cssesc = _interopRequireDefault(require("cssesc"));
+var _unesc = _interopRequireDefault(require("../util/unesc"));
+var _namespace = _interopRequireDefault(require("./namespace"));
+var _types = require("./types");
+var _CSSESC_QUOTE_OPTIONS;
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var deprecate = require("util-deprecate");
+var WRAPPED_IN_QUOTES = /^('|")([^]*)\1$/;
+var warnOfDeprecatedValueAssignment = deprecate(function () {}, "Assigning an attribute a value containing characters that might need to be escaped is deprecated. " + "Call attribute.setValue() instead.");
+var warnOfDeprecatedQuotedAssignment = deprecate(function () {}, "Assigning attr.quoted is deprecated and has no effect. Assign to attr.quoteMark instead.");
+var warnOfDeprecatedConstructor = deprecate(function () {}, "Constructing an Attribute selector with a value without specifying quoteMark is deprecated. Note: The value should be unescaped now.");
+function unescapeValue(value) {
+  var deprecatedUsage = false;
+  var quoteMark = null;
+  var unescaped = value;
+  var m = unescaped.match(WRAPPED_IN_QUOTES);
+  if (m) {
+    quoteMark = m[1];
+    unescaped = m[2];
+  }
+  unescaped = (0, _unesc["default"])(unescaped);
+  if (unescaped !== value) {
+    deprecatedUsage = true;
+  }
+  return {
+    deprecatedUsage: deprecatedUsage,
+    unescaped: unescaped,
+    quoteMark: quoteMark
+  };
+}
+function handleDeprecatedContructorOpts(opts) {
+  if (opts.quoteMark !== undefined) {
+    return opts;
+  }
+  if (opts.value === undefined) {
+    return opts;
+  }
+  warnOfDeprecatedConstructor();
+  var _unescapeValue = unescapeValue(opts.value),
+    quoteMark = _unescapeValue.quoteMark,
+    unescaped = _unescapeValue.unescaped;
+  if (!opts.raws) {
+    opts.raws = {};
+  }
+  if (opts.raws.value === undefined) {
+    opts.raws.value = opts.value;
+  }
+  opts.value = unescaped;
+  opts.quoteMark = quoteMark;
+  return opts;
+}
+var Attribute = /*#__PURE__*/function (_Namespace) {
+  _inheritsLoose(Attribute, _Namespace);
+  function Attribute(opts) {
+    var _this;
+    if (opts === void 0) {
+      opts = {};
+    }
+    _this = _Namespace.call(this, handleDeprecatedContructorOpts(opts)) || this;
+    _this.type = _types.ATTRIBUTE;
+    _this.raws = _this.raws || {};
+    Object.defineProperty(_this.raws, 'unquoted', {
+      get: deprecate(function () {
+        return _this.value;
+      }, "attr.raws.unquoted is deprecated. Call attr.value instead."),
+      set: deprecate(function () {
+        return _this.value;
+      }, "Setting attr.raws.unquoted is deprecated and has no effect. attr.value is unescaped by default now.")
+    });
+    _this._constructed = true;
+    return _this;
+  }
+
+  /**
+   * Returns the Attribute's value quoted such that it would be legal to use
+   * in the value of a css file. The original value's quotation setting
+   * used for stringification is left unchanged. See `setValue(value, options)`
+   * if you want to control the quote settings of a new value for the attribute.
+   *
+   * You can also change the quotation used for the current value by setting quoteMark.
+   *
+   * Options:
+   *   * quoteMark {'"' | "'" | null} - Use this value to quote the value. If this
+   *     option is not set, the original value for quoteMark will be used. If
+   *     indeterminate, a double quote is used. The legal values are:
+   *     * `null` - the value will be unquoted and characters will be escaped as necessary.
+   *     * `'` - the value will be quoted with a single quote and single quotes are escaped.
+   *     * `"` - the value will be quoted with a double quote and double quotes are escaped.
+   *   * preferCurrentQuoteMark {boolean} - if true, prefer the source quote mark
+   *     over the quoteMark option value.
+   *   * smart {boolean} - if true, will select a quote mark based on the value
+   *     and the other options specified here. See the `smartQuoteMark()`
+   *     method.
+   **/
+  var _proto = Attribute.prototype;
+  _proto.getQuotedValue = function getQuotedValue(options) {
+    if (options === void 0) {
+      options = {};
+    }
+    var quoteMark = this._determineQuoteMark(options);
+    var cssescopts = CSSESC_QUOTE_OPTIONS[quoteMark];
+    var escaped = (0, _cssesc["default"])(this._value, cssescopts);
+    return escaped;
+  };
+  _proto._determineQuoteMark = function _determineQuoteMark(options) {
+    return options.smart ? this.smartQuoteMark(options) : this.preferredQuoteMark(options);
+  }
+
+  /**
+   * Set the unescaped value with the specified quotation options. The value
+   * provided must not include any wrapping quote marks -- those quotes will
+   * be interpreted as part of the value and escaped accordingly.
+   */;
+  _proto.setValue = function setValue(value, options) {
+    if (options === void 0) {
+      options = {};
+    }
+    this._value = value;
+    this._quoteMark = this._determineQuoteMark(options);
+    this._syncRawValue();
+  }
+
+  /**
+   * Intelligently select a quoteMark value based on the value's contents. If
+   * the value is a legal CSS ident, it will not be quoted. Otherwise a quote
+   * mark will be picked that minimizes the number of escapes.
+   *
+   * If there's no clear winner, the quote mark from these options is used,
+   * then the source quote mark (this is inverted if `preferCurrentQuoteMark` is
+   * true). If the quoteMark is unspecified, a double quote is used.
+   *
+   * @param options This takes the quoteMark and preferCurrentQuoteMark options
+   * from the quoteValue method.
+   */;
+  _proto.smartQuoteMark = function smartQuoteMark(options) {
+    var v = this.value;
+    var numSingleQuotes = v.replace(/[^']/g, '').length;
+    var numDoubleQuotes = v.replace(/[^"]/g, '').length;
+    if (numSingleQuotes + numDoubleQuotes === 0) {
+      var escaped = (0, _cssesc["default"])(v, {
+        isIdentifier: true
+      });
+      if (escaped === v) {
+        return Attribute.NO_QUOTE;
+      } else {
+        var pref = this.preferredQuoteMark(options);
+        if (pref === Attribute.NO_QUOTE) {
+          // pick a quote mark that isn't none and see if it's smaller
+          var quote = this.quoteMark || options.quoteMark || Attribute.DOUBLE_QUOTE;
+          var opts = CSSESC_QUOTE_OPTIONS[quote];
+          var quoteValue = (0, _cssesc["default"])(v, opts);
+          if (quoteValue.length < escaped.length) {
+            return quote;
+          }
+        }
+        return pref;
+      }
+    } else if (numDoubleQuotes === numSingleQuotes) {
+      return this.preferredQuoteMark(options);
+    } else if (numDoubleQuotes < numSingleQuotes) {
+      return Attribute.DOUBLE_QUOTE;
+    } else {
+      return Attribute.SINGLE_QUOTE;
+    }
+  }
+
+  /**
+   * Selects the preferred quote mark based on the options and the current quote mark value.
+   * If you want the quote mark to depend on the attribute value, call `smartQuoteMark(opts)`
+   * instead.
+   */;
+  _proto.preferredQuoteMark = function preferredQuoteMark(options) {
+    var quoteMark = options.preferCurrentQuoteMark ? this.quoteMark : options.quoteMark;
+    if (quoteMark === undefined) {
+      quoteMark = options.preferCurrentQuoteMark ? options.quoteMark : this.quoteMark;
+    }
+    if (quoteMark === undefined) {
+      quoteMark = Attribute.DOUBLE_QUOTE;
+    }
+    return quoteMark;
+  };
+  _proto._syncRawValue = function _syncRawValue() {
+    var rawValue = (0, _cssesc["default"])(this._value, CSSESC_QUOTE_OPTIONS[this.quoteMark]);
+    if (rawValue === this._value) {
+      if (this.raws) {
+        delete this.raws.value;
+      }
+    } else {
+      this.raws.value = rawValue;
+    }
+  };
+  _proto._handleEscapes = function _handleEscapes(prop, value) {
+    if (this._constructed) {
+      var escaped = (0, _cssesc["default"])(value, {
+        isIdentifier: true
+      });
+      if (escaped !== value) {
+        this.raws[prop] = escaped;
+      } else {
+        delete this.raws[prop];
+      }
+    }
+  };
+  _proto._spacesFor = function _spacesFor(name) {
+    var attrSpaces = {
+      before: '',
+      after: ''
+    };
+    var spaces = this.spaces[name] || {};
+    var rawSpaces = this.raws.spaces && this.raws.spaces[name] || {};
+    return Object.assign(attrSpaces, spaces, rawSpaces);
+  };
+  _proto._stringFor = function _stringFor(name, spaceName, concat) {
+    if (spaceName === void 0) {
+      spaceName = name;
+    }
+    if (concat === void 0) {
+      concat = defaultAttrConcat;
+    }
+    var attrSpaces = this._spacesFor(spaceName);
+    return concat(this.stringifyProperty(name), attrSpaces);
+  }
+
+  /**
+   * returns the offset of the attribute part specified relative to the
+   * start of the node of the output string.
+   *
+   * * "ns" - alias for "namespace"
+   * * "namespace" - the namespace if it exists.
+   * * "attribute" - the attribute name
+   * * "attributeNS" - the start of the attribute or its namespace
+   * * "operator" - the match operator of the attribute
+   * * "value" - The value (string or identifier)
+   * * "insensitive" - the case insensitivity flag;
+   * @param part One of the possible values inside an attribute.
+   * @returns -1 if the name is invalid or the value doesn't exist in this attribute.
+   */;
+  _proto.offsetOf = function offsetOf(name) {
+    var count = 1;
+    var attributeSpaces = this._spacesFor("attribute");
+    count += attributeSpaces.before.length;
+    if (name === "namespace" || name === "ns") {
+      return this.namespace ? count : -1;
+    }
+    if (name === "attributeNS") {
+      return count;
+    }
+    count += this.namespaceString.length;
+    if (this.namespace) {
+      count += 1;
+    }
+    if (name === "attribute") {
+      return count;
+    }
+    count += this.stringifyProperty("attribute").length;
+    count += attributeSpaces.after.length;
+    var operatorSpaces = this._spacesFor("operator");
+    count += operatorSpaces.before.length;
+    var operator = this.stringifyProperty("operator");
+    if (name === "operator") {
+      return operator ? count : -1;
+    }
+    count += operator.length;
+    count += operatorSpaces.after.length;
+    var valueSpaces = this._spacesFor("value");
+    count += valueSpaces.before.length;
+    var value = this.stringifyProperty("value");
+    if (name === "value") {
+      return value ? count : -1;
+    }
+    count += value.length;
+    count += valueSpaces.after.length;
+    var insensitiveSpaces = this._spacesFor("insensitive");
+    count += insensitiveSpaces.before.length;
+    if (name === "insensitive") {
+      return this.insensitive ? count : -1;
+    }
+    return -1;
+  };
+  _proto.toString = function toString() {
+    var _this2 = this;
+    var selector = [this.rawSpaceBefore, '['];
+    selector.push(this._stringFor('qualifiedAttribute', 'attribute'));
+    if (this.operator && (this.value || this.value === '')) {
+      selector.push(this._stringFor('operator'));
+      selector.push(this._stringFor('value'));
+      selector.push(this._stringFor('insensitiveFlag', 'insensitive', function (attrValue, attrSpaces) {
+        if (attrValue.length > 0 && !_this2.quoted && attrSpaces.before.length === 0 && !(_this2.spaces.value && _this2.spaces.value.after)) {
+          attrSpaces.before = " ";
+        }
+        return defaultAttrConcat(attrValue, attrSpaces);
+      }));
+    }
+    selector.push(']');
+    selector.push(this.rawSpaceAfter);
+    return selector.join('');
+  };
+  _createClass(Attribute, [{
+    key: "quoted",
+    get: function get() {
+      var qm = this.quoteMark;
+      return qm === "'" || qm === '"';
+    },
+    set: function set(value) {
+      warnOfDeprecatedQuotedAssignment();
+    }
+
+    /**
+     * returns a single (`'`) or double (`"`) quote character if the value is quoted.
+     * returns `null` if the value is not quoted.
+     * returns `undefined` if the quotation state is unknown (this can happen when
+     * the attribute is constructed without specifying a quote mark.)
+     */
+  }, {
+    key: "quoteMark",
+    get: function get() {
+      return this._quoteMark;
+    }
+
+    /**
+     * Set the quote mark to be used by this attribute's value.
+     * If the quote mark changes, the raw (escaped) value at `attr.raws.value` of the attribute
+     * value is updated accordingly.
+     *
+     * @param {"'" | '"' | null} quoteMark The quote mark or `null` if the value should be unquoted.
+     */,
+    set: function set(quoteMark) {
+      if (!this._constructed) {
+        this._quoteMark = quoteMark;
+        return;
+      }
+      if (this._quoteMark !== quoteMark) {
+        this._quoteMark = quoteMark;
+        this._syncRawValue();
+      }
+    }
+  }, {
+    key: "qualifiedAttribute",
+    get: function get() {
+      return this.qualifiedName(this.raws.attribute || this.attribute);
+    }
+  }, {
+    key: "insensitiveFlag",
+    get: function get() {
+      return this.insensitive ? 'i' : '';
+    }
+  }, {
+    key: "value",
+    get: function get() {
+      return this._value;
+    },
+    set:
+    /**
+     * Before 3.0, the value had to be set to an escaped value including any wrapped
+     * quote marks. In 3.0, the semantics of `Attribute.value` changed so that the value
+     * is unescaped during parsing and any quote marks are removed.
+     *
+     * Because the ambiguity of this semantic change, if you set `attr.value = newValue`,
+     * a deprecation warning is raised when the new value contains any characters that would
+     * require escaping (including if it contains wrapped quotes).
+     *
+     * Instead, you should call `attr.setValue(newValue, opts)` and pass options that describe
+     * how the new value is quoted.
+     */
+    function set(v) {
+      if (this._constructed) {
+        var _unescapeValue2 = unescapeValue(v),
+          deprecatedUsage = _unescapeValue2.deprecatedUsage,
+          unescaped = _unescapeValue2.unescaped,
+          quoteMark = _unescapeValue2.quoteMark;
+        if (deprecatedUsage) {
+          warnOfDeprecatedValueAssignment();
+        }
+        if (unescaped === this._value && quoteMark === this._quoteMark) {
+          return;
+        }
+        this._value = unescaped;
+        this._quoteMark = quoteMark;
+        this._syncRawValue();
+      } else {
+        this._value = v;
+      }
+    }
+  }, {
+    key: "insensitive",
+    get: function get() {
+      return this._insensitive;
+    }
+
+    /**
+     * Set the case insensitive flag.
+     * If the case insensitive flag changes, the raw (escaped) value at `attr.raws.insensitiveFlag`
+     * of the attribute is updated accordingly.
+     *
+     * @param {true | false} insensitive true if the attribute should match case-insensitively.
+     */,
+    set: function set(insensitive) {
+      if (!insensitive) {
+        this._insensitive = false;
+
+        // "i" and "I" can be used in "this.raws.insensitiveFlag" to store the original notation.
+        // When setting `attr.insensitive = false` both should be erased to ensure correct serialization.
+        if (this.raws && (this.raws.insensitiveFlag === 'I' || this.raws.insensitiveFlag === 'i')) {
+          this.raws.insensitiveFlag = undefined;
+        }
+      }
+      this._insensitive = insensitive;
+    }
+  }, {
+    key: "attribute",
+    get: function get() {
+      return this._attribute;
+    },
+    set: function set(name) {
+      this._handleEscapes("attribute", name);
+      this._attribute = name;
+    }
+  }]);
+  return Attribute;
+}(_namespace["default"]);
+exports["default"] = Attribute;
+Attribute.NO_QUOTE = null;
+Attribute.SINGLE_QUOTE = "'";
+Attribute.DOUBLE_QUOTE = '"';
+var CSSESC_QUOTE_OPTIONS = (_CSSESC_QUOTE_OPTIONS = {
+  "'": {
+    quotes: 'single',
+    wrap: true
+  },
+  '"': {
+    quotes: 'double',
+    wrap: true
+  }
+}, _CSSESC_QUOTE_OPTIONS[null] = {
+  isIdentifier: true
+}, _CSSESC_QUOTE_OPTIONS);
+function defaultAttrConcat(attrValue, attrSpaces) {
+  return "" + attrSpaces.before + attrValue + attrSpaces.after;
+}
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/className.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/className.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/className.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,50 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _cssesc = _interopRequireDefault(require("cssesc"));
+var _util = require("../util");
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var ClassName = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(ClassName, _Node);
+  function ClassName(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.CLASS;
+    _this._constructed = true;
+    return _this;
+  }
+  var _proto = ClassName.prototype;
+  _proto.valueToString = function valueToString() {
+    return '.' + _Node.prototype.valueToString.call(this);
+  };
+  _createClass(ClassName, [{
+    key: "value",
+    get: function get() {
+      return this._value;
+    },
+    set: function set(v) {
+      if (this._constructed) {
+        var escaped = (0, _cssesc["default"])(v, {
+          isIdentifier: true
+        });
+        if (escaped !== v) {
+          (0, _util.ensureObject)(this, "raws");
+          this.raws.value = escaped;
+        } else if (this.raws) {
+          delete this.raws.value;
+        }
+      }
+      this._value = v;
+    }
+  }]);
+  return ClassName;
+}(_node["default"]);
+exports["default"] = ClassName;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/combinator.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/combinator.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/combinator.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Combinator = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Combinator, _Node);
+  function Combinator(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.COMBINATOR;
+    return _this;
+  }
+  return Combinator;
+}(_node["default"]);
+exports["default"] = Combinator;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/comment.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/comment.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/comment.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Comment = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Comment, _Node);
+  function Comment(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.COMMENT;
+    return _this;
+  }
+  return Comment;
+}(_node["default"]);
+exports["default"] = Comment;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/constructors.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/constructors.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/constructors.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,65 @@
+"use strict";
+
+exports.__esModule = true;
+exports.universal = exports.tag = exports.string = exports.selector = exports.root = exports.pseudo = exports.nesting = exports.id = exports.comment = exports.combinator = exports.className = exports.attribute = void 0;
+var _attribute = _interopRequireDefault(require("./attribute"));
+var _className = _interopRequireDefault(require("./className"));
+var _combinator = _interopRequireDefault(require("./combinator"));
+var _comment = _interopRequireDefault(require("./comment"));
+var _id = _interopRequireDefault(require("./id"));
+var _nesting = _interopRequireDefault(require("./nesting"));
+var _pseudo = _interopRequireDefault(require("./pseudo"));
+var _root = _interopRequireDefault(require("./root"));
+var _selector = _interopRequireDefault(require("./selector"));
+var _string = _interopRequireDefault(require("./string"));
+var _tag = _interopRequireDefault(require("./tag"));
+var _universal = _interopRequireDefault(require("./universal"));
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+var attribute = function attribute(opts) {
+  return new _attribute["default"](opts);
+};
+exports.attribute = attribute;
+var className = function className(opts) {
+  return new _className["default"](opts);
+};
+exports.className = className;
+var combinator = function combinator(opts) {
+  return new _combinator["default"](opts);
+};
+exports.combinator = combinator;
+var comment = function comment(opts) {
+  return new _comment["default"](opts);
+};
+exports.comment = comment;
+var id = function id(opts) {
+  return new _id["default"](opts);
+};
+exports.id = id;
+var nesting = function nesting(opts) {
+  return new _nesting["default"](opts);
+};
+exports.nesting = nesting;
+var pseudo = function pseudo(opts) {
+  return new _pseudo["default"](opts);
+};
+exports.pseudo = pseudo;
+var root = function root(opts) {
+  return new _root["default"](opts);
+};
+exports.root = root;
+var selector = function selector(opts) {
+  return new _selector["default"](opts);
+};
+exports.selector = selector;
+var string = function string(opts) {
+  return new _string["default"](opts);
+};
+exports.string = string;
+var tag = function tag(opts) {
+  return new _tag["default"](opts);
+};
+exports.tag = tag;
+var universal = function universal(opts) {
+  return new _universal["default"](opts);
+};
+exports.universal = universal;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/container.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/container.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/container.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,308 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var types = _interopRequireWildcard(require("./types"));
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (it) return (it = it.call(o)).next.bind(it); if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Container = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Container, _Node);
+  function Container(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    if (!_this.nodes) {
+      _this.nodes = [];
+    }
+    return _this;
+  }
+  var _proto = Container.prototype;
+  _proto.append = function append(selector) {
+    selector.parent = this;
+    this.nodes.push(selector);
+    return this;
+  };
+  _proto.prepend = function prepend(selector) {
+    selector.parent = this;
+    this.nodes.unshift(selector);
+    return this;
+  };
+  _proto.at = function at(index) {
+    return this.nodes[index];
+  };
+  _proto.index = function index(child) {
+    if (typeof child === 'number') {
+      return child;
+    }
+    return this.nodes.indexOf(child);
+  };
+  _proto.removeChild = function removeChild(child) {
+    child = this.index(child);
+    this.at(child).parent = undefined;
+    this.nodes.splice(child, 1);
+    var index;
+    for (var id in this.indexes) {
+      index = this.indexes[id];
+      if (index >= child) {
+        this.indexes[id] = index - 1;
+      }
+    }
+    return this;
+  };
+  _proto.removeAll = function removeAll() {
+    for (var _iterator = _createForOfIteratorHelperLoose(this.nodes), _step; !(_step = _iterator()).done;) {
+      var node = _step.value;
+      node.parent = undefined;
+    }
+    this.nodes = [];
+    return this;
+  };
+  _proto.empty = function empty() {
+    return this.removeAll();
+  };
+  _proto.insertAfter = function insertAfter(oldNode, newNode) {
+    newNode.parent = this;
+    var oldIndex = this.index(oldNode);
+    this.nodes.splice(oldIndex + 1, 0, newNode);
+    newNode.parent = this;
+    var index;
+    for (var id in this.indexes) {
+      index = this.indexes[id];
+      if (oldIndex <= index) {
+        this.indexes[id] = index + 1;
+      }
+    }
+    return this;
+  };
+  _proto.insertBefore = function insertBefore(oldNode, newNode) {
+    newNode.parent = this;
+    var oldIndex = this.index(oldNode);
+    this.nodes.splice(oldIndex, 0, newNode);
+    newNode.parent = this;
+    var index;
+    for (var id in this.indexes) {
+      index = this.indexes[id];
+      if (index <= oldIndex) {
+        this.indexes[id] = index + 1;
+      }
+    }
+    return this;
+  };
+  _proto._findChildAtPosition = function _findChildAtPosition(line, col) {
+    var found = undefined;
+    this.each(function (node) {
+      if (node.atPosition) {
+        var foundChild = node.atPosition(line, col);
+        if (foundChild) {
+          found = foundChild;
+          return false;
+        }
+      } else if (node.isAtPosition(line, col)) {
+        found = node;
+        return false;
+      }
+    });
+    return found;
+  }
+
+  /**
+   * Return the most specific node at the line and column number given.
+   * The source location is based on the original parsed location, locations aren't
+   * updated as selector nodes are mutated.
+   * 
+   * Note that this location is relative to the location of the first character
+   * of the selector, and not the location of the selector in the overall document
+   * when used in conjunction with postcss.
+   *
+   * If not found, returns undefined.
+   * @param {number} line The line number of the node to find. (1-based index)
+   * @param {number} col  The column number of the node to find. (1-based index)
+   */;
+  _proto.atPosition = function atPosition(line, col) {
+    if (this.isAtPosition(line, col)) {
+      return this._findChildAtPosition(line, col) || this;
+    } else {
+      return undefined;
+    }
+  };
+  _proto._inferEndPosition = function _inferEndPosition() {
+    if (this.last && this.last.source && this.last.source.end) {
+      this.source = this.source || {};
+      this.source.end = this.source.end || {};
+      Object.assign(this.source.end, this.last.source.end);
+    }
+  };
+  _proto.each = function each(callback) {
+    if (!this.lastEach) {
+      this.lastEach = 0;
+    }
+    if (!this.indexes) {
+      this.indexes = {};
+    }
+    this.lastEach++;
+    var id = this.lastEach;
+    this.indexes[id] = 0;
+    if (!this.length) {
+      return undefined;
+    }
+    var index, result;
+    while (this.indexes[id] < this.length) {
+      index = this.indexes[id];
+      result = callback(this.at(index), index);
+      if (result === false) {
+        break;
+      }
+      this.indexes[id] += 1;
+    }
+    delete this.indexes[id];
+    if (result === false) {
+      return false;
+    }
+  };
+  _proto.walk = function walk(callback) {
+    return this.each(function (node, i) {
+      var result = callback(node, i);
+      if (result !== false && node.length) {
+        result = node.walk(callback);
+      }
+      if (result === false) {
+        return false;
+      }
+    });
+  };
+  _proto.walkAttributes = function walkAttributes(callback) {
+    var _this2 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.ATTRIBUTE) {
+        return callback.call(_this2, selector);
+      }
+    });
+  };
+  _proto.walkClasses = function walkClasses(callback) {
+    var _this3 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.CLASS) {
+        return callback.call(_this3, selector);
+      }
+    });
+  };
+  _proto.walkCombinators = function walkCombinators(callback) {
+    var _this4 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.COMBINATOR) {
+        return callback.call(_this4, selector);
+      }
+    });
+  };
+  _proto.walkComments = function walkComments(callback) {
+    var _this5 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.COMMENT) {
+        return callback.call(_this5, selector);
+      }
+    });
+  };
+  _proto.walkIds = function walkIds(callback) {
+    var _this6 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.ID) {
+        return callback.call(_this6, selector);
+      }
+    });
+  };
+  _proto.walkNesting = function walkNesting(callback) {
+    var _this7 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.NESTING) {
+        return callback.call(_this7, selector);
+      }
+    });
+  };
+  _proto.walkPseudos = function walkPseudos(callback) {
+    var _this8 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.PSEUDO) {
+        return callback.call(_this8, selector);
+      }
+    });
+  };
+  _proto.walkTags = function walkTags(callback) {
+    var _this9 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.TAG) {
+        return callback.call(_this9, selector);
+      }
+    });
+  };
+  _proto.walkUniversals = function walkUniversals(callback) {
+    var _this10 = this;
+    return this.walk(function (selector) {
+      if (selector.type === types.UNIVERSAL) {
+        return callback.call(_this10, selector);
+      }
+    });
+  };
+  _proto.split = function split(callback) {
+    var _this11 = this;
+    var current = [];
+    return this.reduce(function (memo, node, index) {
+      var split = callback.call(_this11, node);
+      current.push(node);
+      if (split) {
+        memo.push(current);
+        current = [];
+      } else if (index === _this11.length - 1) {
+        memo.push(current);
+      }
+      return memo;
+    }, []);
+  };
+  _proto.map = function map(callback) {
+    return this.nodes.map(callback);
+  };
+  _proto.reduce = function reduce(callback, memo) {
+    return this.nodes.reduce(callback, memo);
+  };
+  _proto.every = function every(callback) {
+    return this.nodes.every(callback);
+  };
+  _proto.some = function some(callback) {
+    return this.nodes.some(callback);
+  };
+  _proto.filter = function filter(callback) {
+    return this.nodes.filter(callback);
+  };
+  _proto.sort = function sort(callback) {
+    return this.nodes.sort(callback);
+  };
+  _proto.toString = function toString() {
+    return this.map(String).join('');
+  };
+  _createClass(Container, [{
+    key: "first",
+    get: function get() {
+      return this.at(0);
+    }
+  }, {
+    key: "last",
+    get: function get() {
+      return this.at(this.length - 1);
+    }
+  }, {
+    key: "length",
+    get: function get() {
+      return this.nodes.length;
+    }
+  }]);
+  return Container;
+}(_node["default"]);
+exports["default"] = Container;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/guards.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/guards.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/guards.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,58 @@
+"use strict";
+
+exports.__esModule = true;
+exports.isComment = exports.isCombinator = exports.isClassName = exports.isAttribute = void 0;
+exports.isContainer = isContainer;
+exports.isIdentifier = void 0;
+exports.isNamespace = isNamespace;
+exports.isNesting = void 0;
+exports.isNode = isNode;
+exports.isPseudo = void 0;
+exports.isPseudoClass = isPseudoClass;
+exports.isPseudoElement = isPseudoElement;
+exports.isUniversal = exports.isTag = exports.isString = exports.isSelector = exports.isRoot = void 0;
+var _types = require("./types");
+var _IS_TYPE;
+var IS_TYPE = (_IS_TYPE = {}, _IS_TYPE[_types.ATTRIBUTE] = true, _IS_TYPE[_types.CLASS] = true, _IS_TYPE[_types.COMBINATOR] = true, _IS_TYPE[_types.COMMENT] = true, _IS_TYPE[_types.ID] = true, _IS_TYPE[_types.NESTING] = true, _IS_TYPE[_types.PSEUDO] = true, _IS_TYPE[_types.ROOT] = true, _IS_TYPE[_types.SELECTOR] = true, _IS_TYPE[_types.STRING] = true, _IS_TYPE[_types.TAG] = true, _IS_TYPE[_types.UNIVERSAL] = true, _IS_TYPE);
+function isNode(node) {
+  return typeof node === "object" && IS_TYPE[node.type];
+}
+function isNodeType(type, node) {
+  return isNode(node) && node.type === type;
+}
+var isAttribute = isNodeType.bind(null, _types.ATTRIBUTE);
+exports.isAttribute = isAttribute;
+var isClassName = isNodeType.bind(null, _types.CLASS);
+exports.isClassName = isClassName;
+var isCombinator = isNodeType.bind(null, _types.COMBINATOR);
+exports.isCombinator = isCombinator;
+var isComment = isNodeType.bind(null, _types.COMMENT);
+exports.isComment = isComment;
+var isIdentifier = isNodeType.bind(null, _types.ID);
+exports.isIdentifier = isIdentifier;
+var isNesting = isNodeType.bind(null, _types.NESTING);
+exports.isNesting = isNesting;
+var isPseudo = isNodeType.bind(null, _types.PSEUDO);
+exports.isPseudo = isPseudo;
+var isRoot = isNodeType.bind(null, _types.ROOT);
+exports.isRoot = isRoot;
+var isSelector = isNodeType.bind(null, _types.SELECTOR);
+exports.isSelector = isSelector;
+var isString = isNodeType.bind(null, _types.STRING);
+exports.isString = isString;
+var isTag = isNodeType.bind(null, _types.TAG);
+exports.isTag = isTag;
+var isUniversal = isNodeType.bind(null, _types.UNIVERSAL);
+exports.isUniversal = isUniversal;
+function isPseudoElement(node) {
+  return isPseudo(node) && node.value && (node.value.startsWith("::") || node.value.toLowerCase() === ":before" || node.value.toLowerCase() === ":after" || node.value.toLowerCase() === ":first-letter" || node.value.toLowerCase() === ":first-line");
+}
+function isPseudoClass(node) {
+  return isPseudo(node) && !isPseudoElement(node);
+}
+function isContainer(node) {
+  return !!(isNode(node) && node.walk);
+}
+function isNamespace(node) {
+  return isAttribute(node) || isTag(node);
+}
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/id.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/id.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/id.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,25 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var ID = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(ID, _Node);
+  function ID(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.ID;
+    return _this;
+  }
+  var _proto = ID.prototype;
+  _proto.valueToString = function valueToString() {
+    return '#' + _Node.prototype.valueToString.call(this);
+  };
+  return ID;
+}(_node["default"]);
+exports["default"] = ID;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/index.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+var _types = require("./types");
+Object.keys(_types).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _types[key]) return;
+  exports[key] = _types[key];
+});
+var _constructors = require("./constructors");
+Object.keys(_constructors).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _constructors[key]) return;
+  exports[key] = _constructors[key];
+});
+var _guards = require("./guards");
+Object.keys(_guards).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _guards[key]) return;
+  exports[key] = _guards[key];
+});
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/namespace.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/namespace.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/namespace.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,80 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _cssesc = _interopRequireDefault(require("cssesc"));
+var _util = require("../util");
+var _node = _interopRequireDefault(require("./node"));
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Namespace = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Namespace, _Node);
+  function Namespace() {
+    return _Node.apply(this, arguments) || this;
+  }
+  var _proto = Namespace.prototype;
+  _proto.qualifiedName = function qualifiedName(value) {
+    if (this.namespace) {
+      return this.namespaceString + "|" + value;
+    } else {
+      return value;
+    }
+  };
+  _proto.valueToString = function valueToString() {
+    return this.qualifiedName(_Node.prototype.valueToString.call(this));
+  };
+  _createClass(Namespace, [{
+    key: "namespace",
+    get: function get() {
+      return this._namespace;
+    },
+    set: function set(namespace) {
+      if (namespace === true || namespace === "*" || namespace === "&") {
+        this._namespace = namespace;
+        if (this.raws) {
+          delete this.raws.namespace;
+        }
+        return;
+      }
+      var escaped = (0, _cssesc["default"])(namespace, {
+        isIdentifier: true
+      });
+      this._namespace = namespace;
+      if (escaped !== namespace) {
+        (0, _util.ensureObject)(this, "raws");
+        this.raws.namespace = escaped;
+      } else if (this.raws) {
+        delete this.raws.namespace;
+      }
+    }
+  }, {
+    key: "ns",
+    get: function get() {
+      return this._namespace;
+    },
+    set: function set(namespace) {
+      this.namespace = namespace;
+    }
+  }, {
+    key: "namespaceString",
+    get: function get() {
+      if (this.namespace) {
+        var ns = this.stringifyProperty("namespace");
+        if (ns === true) {
+          return '';
+        } else {
+          return ns;
+        }
+      } else {
+        return '';
+      }
+    }
+  }]);
+  return Namespace;
+}(_node["default"]);
+exports["default"] = Namespace;
+;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/nesting.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/nesting.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/nesting.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,22 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Nesting = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(Nesting, _Node);
+  function Nesting(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.NESTING;
+    _this.value = '&';
+    return _this;
+  }
+  return Nesting;
+}(_node["default"]);
+exports["default"] = Nesting;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/node.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/node.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/node.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,192 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _util = require("../util");
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+var cloneNode = function cloneNode(obj, parent) {
+  if (typeof obj !== 'object' || obj === null) {
+    return obj;
+  }
+  var cloned = new obj.constructor();
+  for (var i in obj) {
+    if (!obj.hasOwnProperty(i)) {
+      continue;
+    }
+    var value = obj[i];
+    var type = typeof value;
+    if (i === 'parent' && type === 'object') {
+      if (parent) {
+        cloned[i] = parent;
+      }
+    } else if (value instanceof Array) {
+      cloned[i] = value.map(function (j) {
+        return cloneNode(j, cloned);
+      });
+    } else {
+      cloned[i] = cloneNode(value, cloned);
+    }
+  }
+  return cloned;
+};
+var Node = /*#__PURE__*/function () {
+  function Node(opts) {
+    if (opts === void 0) {
+      opts = {};
+    }
+    Object.assign(this, opts);
+    this.spaces = this.spaces || {};
+    this.spaces.before = this.spaces.before || '';
+    this.spaces.after = this.spaces.after || '';
+  }
+  var _proto = Node.prototype;
+  _proto.remove = function remove() {
+    if (this.parent) {
+      this.parent.removeChild(this);
+    }
+    this.parent = undefined;
+    return this;
+  };
+  _proto.replaceWith = function replaceWith() {
+    if (this.parent) {
+      for (var index in arguments) {
+        this.parent.insertBefore(this, arguments[index]);
+      }
+      this.remove();
+    }
+    return this;
+  };
+  _proto.next = function next() {
+    return this.parent.at(this.parent.index(this) + 1);
+  };
+  _proto.prev = function prev() {
+    return this.parent.at(this.parent.index(this) - 1);
+  };
+  _proto.clone = function clone(overrides) {
+    if (overrides === void 0) {
+      overrides = {};
+    }
+    var cloned = cloneNode(this);
+    for (var name in overrides) {
+      cloned[name] = overrides[name];
+    }
+    return cloned;
+  }
+
+  /**
+   * Some non-standard syntax doesn't follow normal escaping rules for css.
+   * This allows non standard syntax to be appended to an existing property
+   * by specifying the escaped value. By specifying the escaped value,
+   * illegal characters are allowed to be directly inserted into css output.
+   * @param {string} name the property to set
+   * @param {any} value the unescaped value of the property
+   * @param {string} valueEscaped optional. the escaped value of the property.
+   */;
+  _proto.appendToPropertyAndEscape = function appendToPropertyAndEscape(name, value, valueEscaped) {
+    if (!this.raws) {
+      this.raws = {};
+    }
+    var originalValue = this[name];
+    var originalEscaped = this.raws[name];
+    this[name] = originalValue + value; // this may trigger a setter that updates raws, so it has to be set first.
+    if (originalEscaped || valueEscaped !== value) {
+      this.raws[name] = (originalEscaped || originalValue) + valueEscaped;
+    } else {
+      delete this.raws[name]; // delete any escaped value that was created by the setter.
+    }
+  }
+
+  /**
+   * Some non-standard syntax doesn't follow normal escaping rules for css.
+   * This allows the escaped value to be specified directly, allowing illegal
+   * characters to be directly inserted into css output.
+   * @param {string} name the property to set
+   * @param {any} value the unescaped value of the property
+   * @param {string} valueEscaped the escaped value of the property.
+   */;
+  _proto.setPropertyAndEscape = function setPropertyAndEscape(name, value, valueEscaped) {
+    if (!this.raws) {
+      this.raws = {};
+    }
+    this[name] = value; // this may trigger a setter that updates raws, so it has to be set first.
+    this.raws[name] = valueEscaped;
+  }
+
+  /**
+   * When you want a value to passed through to CSS directly. This method
+   * deletes the corresponding raw value causing the stringifier to fallback
+   * to the unescaped value.
+   * @param {string} name the property to set.
+   * @param {any} value The value that is both escaped and unescaped.
+   */;
+  _proto.setPropertyWithoutEscape = function setPropertyWithoutEscape(name, value) {
+    this[name] = value; // this may trigger a setter that updates raws, so it has to be set first.
+    if (this.raws) {
+      delete this.raws[name];
+    }
+  }
+
+  /**
+   *
+   * @param {number} line The number (starting with 1)
+   * @param {number} column The column number (starting with 1)
+   */;
+  _proto.isAtPosition = function isAtPosition(line, column) {
+    if (this.source && this.source.start && this.source.end) {
+      if (this.source.start.line > line) {
+        return false;
+      }
+      if (this.source.end.line < line) {
+        return false;
+      }
+      if (this.source.start.line === line && this.source.start.column > column) {
+        return false;
+      }
+      if (this.source.end.line === line && this.source.end.column < column) {
+        return false;
+      }
+      return true;
+    }
+    return undefined;
+  };
+  _proto.stringifyProperty = function stringifyProperty(name) {
+    return this.raws && this.raws[name] || this[name];
+  };
+  _proto.valueToString = function valueToString() {
+    return String(this.stringifyProperty("value"));
+  };
+  _proto.toString = function toString() {
+    return [this.rawSpaceBefore, this.valueToString(), this.rawSpaceAfter].join('');
+  };
+  _createClass(Node, [{
+    key: "rawSpaceBefore",
+    get: function get() {
+      var rawSpace = this.raws && this.raws.spaces && this.raws.spaces.before;
+      if (rawSpace === undefined) {
+        rawSpace = this.spaces && this.spaces.before;
+      }
+      return rawSpace || "";
+    },
+    set: function set(raw) {
+      (0, _util.ensureObject)(this, "raws", "spaces");
+      this.raws.spaces.before = raw;
+    }
+  }, {
+    key: "rawSpaceAfter",
+    get: function get() {
+      var rawSpace = this.raws && this.raws.spaces && this.raws.spaces.after;
+      if (rawSpace === undefined) {
+        rawSpace = this.spaces.after;
+      }
+      return rawSpace || "";
+    },
+    set: function set(raw) {
+      (0, _util.ensureObject)(this, "raws", "spaces");
+      this.raws.spaces.after = raw;
+    }
+  }]);
+  return Node;
+}();
+exports["default"] = Node;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/pseudo.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/pseudo.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/pseudo.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,26 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _container = _interopRequireDefault(require("./container"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Pseudo = /*#__PURE__*/function (_Container) {
+  _inheritsLoose(Pseudo, _Container);
+  function Pseudo(opts) {
+    var _this;
+    _this = _Container.call(this, opts) || this;
+    _this.type = _types.PSEUDO;
+    return _this;
+  }
+  var _proto = Pseudo.prototype;
+  _proto.toString = function toString() {
+    var params = this.length ? '(' + this.map(String).join(',') + ')' : '';
+    return [this.rawSpaceBefore, this.stringifyProperty("value"), params, this.rawSpaceAfter].join('');
+  };
+  return Pseudo;
+}(_container["default"]);
+exports["default"] = Pseudo;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/root.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/root.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/root.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,44 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _container = _interopRequireDefault(require("./container"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Root = /*#__PURE__*/function (_Container) {
+  _inheritsLoose(Root, _Container);
+  function Root(opts) {
+    var _this;
+    _this = _Container.call(this, opts) || this;
+    _this.type = _types.ROOT;
+    return _this;
+  }
+  var _proto = Root.prototype;
+  _proto.toString = function toString() {
+    var str = this.reduce(function (memo, selector) {
+      memo.push(String(selector));
+      return memo;
+    }, []).join(',');
+    return this.trailingComma ? str + ',' : str;
+  };
+  _proto.error = function error(message, options) {
+    if (this._error) {
+      return this._error(message, options);
+    } else {
+      return new Error(message);
+    }
+  };
+  _createClass(Root, [{
+    key: "errorGenerator",
+    set: function set(handler) {
+      this._error = handler;
+    }
+  }]);
+  return Root;
+}(_container["default"]);
+exports["default"] = Root;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/selector.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/selector.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/selector.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _container = _interopRequireDefault(require("./container"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Selector = /*#__PURE__*/function (_Container) {
+  _inheritsLoose(Selector, _Container);
+  function Selector(opts) {
+    var _this;
+    _this = _Container.call(this, opts) || this;
+    _this.type = _types.SELECTOR;
+    return _this;
+  }
+  return Selector;
+}(_container["default"]);
+exports["default"] = Selector;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/string.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/string.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/string.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _node = _interopRequireDefault(require("./node"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var String = /*#__PURE__*/function (_Node) {
+  _inheritsLoose(String, _Node);
+  function String(opts) {
+    var _this;
+    _this = _Node.call(this, opts) || this;
+    _this.type = _types.STRING;
+    return _this;
+  }
+  return String;
+}(_node["default"]);
+exports["default"] = String;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/tag.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/tag.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/tag.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _namespace = _interopRequireDefault(require("./namespace"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Tag = /*#__PURE__*/function (_Namespace) {
+  _inheritsLoose(Tag, _Namespace);
+  function Tag(opts) {
+    var _this;
+    _this = _Namespace.call(this, opts) || this;
+    _this.type = _types.TAG;
+    return _this;
+  }
+  return Tag;
+}(_namespace["default"]);
+exports["default"] = Tag;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/types.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/types.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/types.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,28 @@
+"use strict";
+
+exports.__esModule = true;
+exports.UNIVERSAL = exports.TAG = exports.STRING = exports.SELECTOR = exports.ROOT = exports.PSEUDO = exports.NESTING = exports.ID = exports.COMMENT = exports.COMBINATOR = exports.CLASS = exports.ATTRIBUTE = void 0;
+var TAG = 'tag';
+exports.TAG = TAG;
+var STRING = 'string';
+exports.STRING = STRING;
+var SELECTOR = 'selector';
+exports.SELECTOR = SELECTOR;
+var ROOT = 'root';
+exports.ROOT = ROOT;
+var PSEUDO = 'pseudo';
+exports.PSEUDO = PSEUDO;
+var NESTING = 'nesting';
+exports.NESTING = NESTING;
+var ID = 'id';
+exports.ID = ID;
+var COMMENT = 'comment';
+exports.COMMENT = COMMENT;
+var COMBINATOR = 'combinator';
+exports.COMBINATOR = COMBINATOR;
+var CLASS = 'class';
+exports.CLASS = CLASS;
+var ATTRIBUTE = 'attribute';
+exports.ATTRIBUTE = ATTRIBUTE;
+var UNIVERSAL = 'universal';
+exports.UNIVERSAL = UNIVERSAL;
Index: frontend/node_modules/postcss-selector-parser/dist/selectors/universal.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/selectors/universal.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/selectors/universal.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,22 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = void 0;
+var _namespace = _interopRequireDefault(require("./namespace"));
+var _types = require("./types");
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; _setPrototypeOf(subClass, superClass); }
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+var Universal = /*#__PURE__*/function (_Namespace) {
+  _inheritsLoose(Universal, _Namespace);
+  function Universal(opts) {
+    var _this;
+    _this = _Namespace.call(this, opts) || this;
+    _this.type = _types.UNIVERSAL;
+    _this.value = '*';
+    return _this;
+  }
+  return Universal;
+}(_namespace["default"]);
+exports["default"] = Universal;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/sortAscending.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/sortAscending.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/sortAscending.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,11 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = sortAscending;
+function sortAscending(list) {
+  return list.sort(function (a, b) {
+    return a - b;
+  });
+}
+;
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/tokenTypes.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/tokenTypes.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/tokenTypes.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,70 @@
+"use strict";
+
+exports.__esModule = true;
+exports.word = exports.tilde = exports.tab = exports.str = exports.space = exports.slash = exports.singleQuote = exports.semicolon = exports.plus = exports.pipe = exports.openSquare = exports.openParenthesis = exports.newline = exports.greaterThan = exports.feed = exports.equals = exports.doubleQuote = exports.dollar = exports.cr = exports.comment = exports.comma = exports.combinator = exports.colon = exports.closeSquare = exports.closeParenthesis = exports.caret = exports.bang = exports.backslash = exports.at = exports.asterisk = exports.ampersand = void 0;
+var ampersand = 38; // `&`.charCodeAt(0);
+exports.ampersand = ampersand;
+var asterisk = 42; // `*`.charCodeAt(0);
+exports.asterisk = asterisk;
+var at = 64; // `@`.charCodeAt(0);
+exports.at = at;
+var comma = 44; // `,`.charCodeAt(0);
+exports.comma = comma;
+var colon = 58; // `:`.charCodeAt(0);
+exports.colon = colon;
+var semicolon = 59; // `;`.charCodeAt(0);
+exports.semicolon = semicolon;
+var openParenthesis = 40; // `(`.charCodeAt(0);
+exports.openParenthesis = openParenthesis;
+var closeParenthesis = 41; // `)`.charCodeAt(0);
+exports.closeParenthesis = closeParenthesis;
+var openSquare = 91; // `[`.charCodeAt(0);
+exports.openSquare = openSquare;
+var closeSquare = 93; // `]`.charCodeAt(0);
+exports.closeSquare = closeSquare;
+var dollar = 36; // `$`.charCodeAt(0);
+exports.dollar = dollar;
+var tilde = 126; // `~`.charCodeAt(0);
+exports.tilde = tilde;
+var caret = 94; // `^`.charCodeAt(0);
+exports.caret = caret;
+var plus = 43; // `+`.charCodeAt(0);
+exports.plus = plus;
+var equals = 61; // `=`.charCodeAt(0);
+exports.equals = equals;
+var pipe = 124; // `|`.charCodeAt(0);
+exports.pipe = pipe;
+var greaterThan = 62; // `>`.charCodeAt(0);
+exports.greaterThan = greaterThan;
+var space = 32; // ` `.charCodeAt(0);
+exports.space = space;
+var singleQuote = 39; // `'`.charCodeAt(0);
+exports.singleQuote = singleQuote;
+var doubleQuote = 34; // `"`.charCodeAt(0);
+exports.doubleQuote = doubleQuote;
+var slash = 47; // `/`.charCodeAt(0);
+exports.slash = slash;
+var bang = 33; // `!`.charCodeAt(0);
+exports.bang = bang;
+var backslash = 92; // '\\'.charCodeAt(0);
+exports.backslash = backslash;
+var cr = 13; // '\r'.charCodeAt(0);
+exports.cr = cr;
+var feed = 12; // '\f'.charCodeAt(0);
+exports.feed = feed;
+var newline = 10; // '\n'.charCodeAt(0);
+exports.newline = newline;
+var tab = 9; // '\t'.charCodeAt(0);
+
+// Expose aliases primarily for readability.
+exports.tab = tab;
+var str = singleQuote;
+
+// No good single character representation!
+exports.str = str;
+var comment = -1;
+exports.comment = comment;
+var word = -2;
+exports.word = word;
+var combinator = -3;
+exports.combinator = combinator;
Index: frontend/node_modules/postcss-selector-parser/dist/tokenize.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/tokenize.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/tokenize.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,239 @@
+"use strict";
+
+exports.__esModule = true;
+exports.FIELDS = void 0;
+exports["default"] = tokenize;
+var t = _interopRequireWildcard(require("./tokenTypes"));
+var _unescapable, _wordDelimiters;
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+var unescapable = (_unescapable = {}, _unescapable[t.tab] = true, _unescapable[t.newline] = true, _unescapable[t.cr] = true, _unescapable[t.feed] = true, _unescapable);
+var wordDelimiters = (_wordDelimiters = {}, _wordDelimiters[t.space] = true, _wordDelimiters[t.tab] = true, _wordDelimiters[t.newline] = true, _wordDelimiters[t.cr] = true, _wordDelimiters[t.feed] = true, _wordDelimiters[t.ampersand] = true, _wordDelimiters[t.asterisk] = true, _wordDelimiters[t.bang] = true, _wordDelimiters[t.comma] = true, _wordDelimiters[t.colon] = true, _wordDelimiters[t.semicolon] = true, _wordDelimiters[t.openParenthesis] = true, _wordDelimiters[t.closeParenthesis] = true, _wordDelimiters[t.openSquare] = true, _wordDelimiters[t.closeSquare] = true, _wordDelimiters[t.singleQuote] = true, _wordDelimiters[t.doubleQuote] = true, _wordDelimiters[t.plus] = true, _wordDelimiters[t.pipe] = true, _wordDelimiters[t.tilde] = true, _wordDelimiters[t.greaterThan] = true, _wordDelimiters[t.equals] = true, _wordDelimiters[t.dollar] = true, _wordDelimiters[t.caret] = true, _wordDelimiters[t.slash] = true, _wordDelimiters);
+var hex = {};
+var hexChars = "0123456789abcdefABCDEF";
+for (var i = 0; i < hexChars.length; i++) {
+  hex[hexChars.charCodeAt(i)] = true;
+}
+
+/**
+ *  Returns the last index of the bar css word
+ * @param {string} css The string in which the word begins
+ * @param {number} start The index into the string where word's first letter occurs
+ */
+function consumeWord(css, start) {
+  var next = start;
+  var code;
+  do {
+    code = css.charCodeAt(next);
+    if (wordDelimiters[code]) {
+      return next - 1;
+    } else if (code === t.backslash) {
+      next = consumeEscape(css, next) + 1;
+    } else {
+      // All other characters are part of the word
+      next++;
+    }
+  } while (next < css.length);
+  return next - 1;
+}
+
+/**
+ *  Returns the last index of the escape sequence
+ * @param {string} css The string in which the sequence begins
+ * @param {number} start The index into the string where escape character (`\`) occurs.
+ */
+function consumeEscape(css, start) {
+  var next = start;
+  var code = css.charCodeAt(next + 1);
+  if (unescapable[code]) {
+    // just consume the escape char
+  } else if (hex[code]) {
+    var hexDigits = 0;
+    // consume up to 6 hex chars
+    do {
+      next++;
+      hexDigits++;
+      code = css.charCodeAt(next + 1);
+    } while (hex[code] && hexDigits < 6);
+    // if fewer than 6 hex chars, a trailing space ends the escape
+    if (hexDigits < 6 && code === t.space) {
+      next++;
+    }
+  } else {
+    // the next char is part of the current word
+    next++;
+  }
+  return next;
+}
+var FIELDS = {
+  TYPE: 0,
+  START_LINE: 1,
+  START_COL: 2,
+  END_LINE: 3,
+  END_COL: 4,
+  START_POS: 5,
+  END_POS: 6
+};
+exports.FIELDS = FIELDS;
+function tokenize(input) {
+  var tokens = [];
+  var css = input.css.valueOf();
+  var _css = css,
+    length = _css.length;
+  var offset = -1;
+  var line = 1;
+  var start = 0;
+  var end = 0;
+  var code, content, endColumn, endLine, escaped, escapePos, last, lines, next, nextLine, nextOffset, quote, tokenType;
+  function unclosed(what, fix) {
+    if (input.safe) {
+      // fyi: this is never set to true.
+      css += fix;
+      next = css.length - 1;
+    } else {
+      throw input.error('Unclosed ' + what, line, start - offset, start);
+    }
+  }
+  while (start < length) {
+    code = css.charCodeAt(start);
+    if (code === t.newline) {
+      offset = start;
+      line += 1;
+    }
+    switch (code) {
+      case t.space:
+      case t.tab:
+      case t.newline:
+      case t.cr:
+      case t.feed:
+        next = start;
+        do {
+          next += 1;
+          code = css.charCodeAt(next);
+          if (code === t.newline) {
+            offset = next;
+            line += 1;
+          }
+        } while (code === t.space || code === t.newline || code === t.tab || code === t.cr || code === t.feed);
+        tokenType = t.space;
+        endLine = line;
+        endColumn = next - offset - 1;
+        end = next;
+        break;
+      case t.plus:
+      case t.greaterThan:
+      case t.tilde:
+      case t.pipe:
+        next = start;
+        do {
+          next += 1;
+          code = css.charCodeAt(next);
+        } while (code === t.plus || code === t.greaterThan || code === t.tilde || code === t.pipe);
+        tokenType = t.combinator;
+        endLine = line;
+        endColumn = start - offset;
+        end = next;
+        break;
+
+      // Consume these characters as single tokens.
+      case t.asterisk:
+      case t.ampersand:
+      case t.bang:
+      case t.comma:
+      case t.equals:
+      case t.dollar:
+      case t.caret:
+      case t.openSquare:
+      case t.closeSquare:
+      case t.colon:
+      case t.semicolon:
+      case t.openParenthesis:
+      case t.closeParenthesis:
+        next = start;
+        tokenType = code;
+        endLine = line;
+        endColumn = start - offset;
+        end = next + 1;
+        break;
+      case t.singleQuote:
+      case t.doubleQuote:
+        quote = code === t.singleQuote ? "'" : '"';
+        next = start;
+        do {
+          escaped = false;
+          next = css.indexOf(quote, next + 1);
+          if (next === -1) {
+            unclosed('quote', quote);
+          }
+          escapePos = next;
+          while (css.charCodeAt(escapePos - 1) === t.backslash) {
+            escapePos -= 1;
+            escaped = !escaped;
+          }
+        } while (escaped);
+        tokenType = t.str;
+        endLine = line;
+        endColumn = start - offset;
+        end = next + 1;
+        break;
+      default:
+        if (code === t.slash && css.charCodeAt(start + 1) === t.asterisk) {
+          next = css.indexOf('*/', start + 2) + 1;
+          if (next === 0) {
+            unclosed('comment', '*/');
+          }
+          content = css.slice(start, next + 1);
+          lines = content.split('\n');
+          last = lines.length - 1;
+          if (last > 0) {
+            nextLine = line + last;
+            nextOffset = next - lines[last].length;
+          } else {
+            nextLine = line;
+            nextOffset = offset;
+          }
+          tokenType = t.comment;
+          line = nextLine;
+          endLine = nextLine;
+          endColumn = next - nextOffset;
+        } else if (code === t.slash) {
+          next = start;
+          tokenType = code;
+          endLine = line;
+          endColumn = start - offset;
+          end = next + 1;
+        } else {
+          next = consumeWord(css, start);
+          tokenType = t.word;
+          endLine = line;
+          endColumn = next - offset;
+        }
+        end = next + 1;
+        break;
+    }
+
+    // Ensure that the token structure remains consistent
+    tokens.push([tokenType,
+    // [0] Token type
+    line,
+    // [1] Starting line
+    start - offset,
+    // [2] Starting column
+    endLine,
+    // [3] Ending line
+    endColumn,
+    // [4] Ending column
+    start,
+    // [5] Start position / Source index
+    end // [6] End position
+    ]);
+
+    // Reset offset for the next token
+    if (nextOffset) {
+      offset = nextOffset;
+      nextOffset = null;
+    }
+    start = end;
+  }
+  return tokens;
+}
Index: frontend/node_modules/postcss-selector-parser/dist/util/ensureObject.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/util/ensureObject.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/util/ensureObject.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,17 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = ensureObject;
+function ensureObject(obj) {
+  for (var _len = arguments.length, props = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    props[_key - 1] = arguments[_key];
+  }
+  while (props.length > 0) {
+    var prop = props.shift();
+    if (!obj[prop]) {
+      obj[prop] = {};
+    }
+    obj = obj[prop];
+  }
+}
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/util/getProp.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/util/getProp.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/util/getProp.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,18 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = getProp;
+function getProp(obj) {
+  for (var _len = arguments.length, props = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    props[_key - 1] = arguments[_key];
+  }
+  while (props.length > 0) {
+    var prop = props.shift();
+    if (!obj[prop]) {
+      return undefined;
+    }
+    obj = obj[prop];
+  }
+  return obj;
+}
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/util/index.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/util/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/util/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,13 @@
+"use strict";
+
+exports.__esModule = true;
+exports.unesc = exports.stripComments = exports.getProp = exports.ensureObject = void 0;
+var _unesc = _interopRequireDefault(require("./unesc"));
+exports.unesc = _unesc["default"];
+var _getProp = _interopRequireDefault(require("./getProp"));
+exports.getProp = _getProp["default"];
+var _ensureObject = _interopRequireDefault(require("./ensureObject"));
+exports.ensureObject = _ensureObject["default"];
+var _stripComments = _interopRequireDefault(require("./stripComments"));
+exports.stripComments = _stripComments["default"];
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
Index: frontend/node_modules/postcss-selector-parser/dist/util/stripComments.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/util/stripComments.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/util/stripComments.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = stripComments;
+function stripComments(str) {
+  var s = "";
+  var commentStart = str.indexOf("/*");
+  var lastEnd = 0;
+  while (commentStart >= 0) {
+    s = s + str.slice(lastEnd, commentStart);
+    var commentEnd = str.indexOf("*/", commentStart + 2);
+    if (commentEnd < 0) {
+      return s;
+    }
+    lastEnd = commentEnd + 2;
+    commentStart = str.indexOf("/*", lastEnd);
+  }
+  s = s + str.slice(lastEnd);
+  return s;
+}
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/dist/util/unesc.js
===================================================================
--- frontend/node_modules/postcss-selector-parser/dist/util/unesc.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/dist/util/unesc.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,76 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = unesc;
+// Many thanks for this post which made this migration much easier.
+// https://mathiasbynens.be/notes/css-escapes
+
+/**
+ * 
+ * @param {string} str 
+ * @returns {[string, number]|undefined}
+ */
+function gobbleHex(str) {
+  var lower = str.toLowerCase();
+  var hex = '';
+  var spaceTerminated = false;
+  for (var i = 0; i < 6 && lower[i] !== undefined; i++) {
+    var code = lower.charCodeAt(i);
+    // check to see if we are dealing with a valid hex char [a-f|0-9]
+    var valid = code >= 97 && code <= 102 || code >= 48 && code <= 57;
+    // https://drafts.csswg.org/css-syntax/#consume-escaped-code-point
+    spaceTerminated = code === 32;
+    if (!valid) {
+      break;
+    }
+    hex += lower[i];
+  }
+  if (hex.length === 0) {
+    return undefined;
+  }
+  var codePoint = parseInt(hex, 16);
+  var isSurrogate = codePoint >= 0xD800 && codePoint <= 0xDFFF;
+  // Add special case for
+  // "If this number is zero, or is for a surrogate, or is greater than the maximum allowed code point"
+  // https://drafts.csswg.org/css-syntax/#maximum-allowed-code-point
+  if (isSurrogate || codePoint === 0x0000 || codePoint > 0x10FFFF) {
+    return ["\uFFFD", hex.length + (spaceTerminated ? 1 : 0)];
+  }
+  return [String.fromCodePoint(codePoint), hex.length + (spaceTerminated ? 1 : 0)];
+}
+var CONTAINS_ESCAPE = /\\/;
+function unesc(str) {
+  var needToProcess = CONTAINS_ESCAPE.test(str);
+  if (!needToProcess) {
+    return str;
+  }
+  var ret = "";
+  for (var i = 0; i < str.length; i++) {
+    if (str[i] === "\\") {
+      var gobbled = gobbleHex(str.slice(i + 1, i + 7));
+      if (gobbled !== undefined) {
+        ret += gobbled[0];
+        i += gobbled[1];
+        continue;
+      }
+
+      // Retain a pair of \\ if double escaped `\\\\`
+      // https://github.com/postcss/postcss-selector-parser/commit/268c9a7656fb53f543dc620aa5b73a30ec3ff20e
+      if (str[i + 1] === "\\") {
+        ret += "\\";
+        i++;
+        continue;
+      }
+
+      // if \\ is at the end of the string retain it
+      // https://github.com/postcss/postcss-selector-parser/commit/01a6b346e3612ce1ab20219acc26abdc259ccefb
+      if (str.length === i + 1) {
+        ret += str[i];
+      }
+      continue;
+    }
+    ret += str[i];
+  }
+  return ret;
+}
+module.exports = exports.default;
Index: frontend/node_modules/postcss-selector-parser/package.json
===================================================================
--- frontend/node_modules/postcss-selector-parser/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,80 @@
+{
+  "name": "postcss-selector-parser",
+  "version": "6.1.2",
+  "devDependencies": {
+    "@babel/cli": "^7.11.6",
+    "@babel/core": "^7.11.6",
+    "@babel/eslint-parser": "^7.11.5",
+    "@babel/eslint-plugin": "^7.11.5",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/preset-env": "^7.11.5",
+    "@babel/register": "^7.11.5",
+    "ava": "^5.1.0",
+    "babel-plugin-add-module-exports": "^1.0.4",
+    "coveralls": "^3.1.0",
+    "del-cli": "^5.0.0",
+    "eslint": "^8.28.0",
+    "eslint-plugin-import": "^2.26.0",
+    "glob": "^8.0.3",
+    "minimist": "^1.2.5",
+    "nyc": "^15.1.0",
+    "postcss": "^8.4.31",
+    "semver": "^7.3.2",
+    "typescript": "^4.0.3"
+  },
+  "main": "dist/index.js",
+  "types": "postcss-selector-parser.d.ts",
+  "files": [
+    "API.md",
+    "CHANGELOG.md",
+    "LICENSE-MIT",
+    "dist",
+    "postcss-selector-parser.d.ts",
+    "!**/__tests__"
+  ],
+  "scripts": {
+    "typecheck": "tsc --noEmit --strict postcss-selector-parser.d.ts postcss-selector-parser.test.ts",
+    "pretest": "eslint src && npm run typecheck",
+    "prepare": "del-cli dist && BABEL_ENV=publish babel src --out-dir dist --ignore /__tests__/",
+    "lintfix": "eslint --fix src",
+    "report": "nyc report --reporter=html",
+    "test": "nyc ava src/__tests__/*.mjs",
+    "testone": "ava"
+  },
+  "dependencies": {
+    "cssesc": "^3.0.0",
+    "util-deprecate": "^1.0.2"
+  },
+  "license": "MIT",
+  "engines": {
+    "node": ">=4"
+  },
+  "homepage": "https://github.com/postcss/postcss-selector-parser",
+  "contributors": [
+    {
+      "name": "Ben Briggs",
+      "email": "beneb.info@gmail.com",
+      "url": "http://beneb.info"
+    },
+    {
+      "name": "Chris Eppstein",
+      "email": "chris@eppsteins.net",
+      "url": "http://twitter.com/chriseppstein"
+    }
+  ],
+  "repository": "postcss/postcss-selector-parser",
+  "ava": {
+    "require": [
+      "@babel/register"
+    ],
+    "concurrency": 5,
+    "timeout": "25s",
+    "nodeArguments": []
+  },
+  "nyc": {
+    "exclude": [
+      "node_modules",
+      "**/__tests__"
+    ]
+  }
+}
Index: frontend/node_modules/postcss-selector-parser/postcss-selector-parser.d.ts
===================================================================
--- frontend/node_modules/postcss-selector-parser/postcss-selector-parser.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-selector-parser/postcss-selector-parser.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,555 @@
+// Type definitions for postcss-selector-parser 2.2.3
+// Definitions by: Chris Eppstein <chris@eppsteins.net>
+
+/*~ Note that ES6 modules cannot directly export callable functions.
+ *~ This file should be imported using the CommonJS-style:
+ *~   import x = require('someLibrary');
+ *~
+ *~ Refer to the documentation to understand common
+ *~ workarounds for this limitation of ES6 modules.
+ */
+
+/*~ This declaration specifies that the function
+ *~ is the exported object from the file
+ */
+export = parser;
+
+// A type that's T but not U.
+type Diff<T, U> = T extends U ? never : T;
+
+// TODO: Conditional types in TS 1.8 will really clean this up.
+declare function parser(): parser.Processor<never>;
+declare function parser<Transform>(processor: parser.AsyncProcessor<Transform>): parser.Processor<Transform, never>;
+declare function parser(processor: parser.AsyncProcessor<void>): parser.Processor<never, never>;
+declare function parser<Transform>(processor: parser.SyncProcessor<Transform>): parser.Processor<Transform>;
+declare function parser(processor: parser.SyncProcessor<void>): parser.Processor<never>;
+declare function parser<Transform>(processor?: parser.SyncProcessor<Transform> | parser.AsyncProcessor<Transform>): parser.Processor<Transform>;
+
+/*~ If you want to expose types from your module as well, you can
+ *~ place them in this block. Often you will want to describe the
+ *~ shape of the return type of the function; that type should
+ *~ be declared in here, as this example shows.
+ */
+declare namespace parser {
+    /* copied from postcss -- so we don't need to add a dependency */
+    type ErrorOptions = {
+        plugin?: string;
+        word?: string;
+        index?: number
+    };
+    /* the bits we use of postcss.Rule, copied from postcss -- so we don't need to add a dependency */
+    type PostCSSRuleNode = {
+        selector: string
+        /**
+         * @returns postcss.CssSyntaxError but it's a complex object, caller
+         *   should cast to it if they have a dependency on postcss.
+         */
+        error(message: string, options?: ErrorOptions): Error;
+    };
+    /** Accepts a string  */
+    type Selectors = string | PostCSSRuleNode
+    type ProcessorFn<ReturnType = void> = (root: parser.Root) => ReturnType;
+    type SyncProcessor<Transform = void> = ProcessorFn<Transform>;
+    type AsyncProcessor<Transform = void> = ProcessorFn<PromiseLike<Transform>>;
+
+    const TAG: "tag";
+    const STRING: "string";
+    const SELECTOR: "selector";
+    const ROOT: "root";
+    const PSEUDO: "pseudo";
+    const NESTING: "nesting";
+    const ID: "id";
+    const COMMENT: "comment";
+    const COMBINATOR: "combinator";
+    const CLASS: "class";
+    const ATTRIBUTE: "attribute";
+    const UNIVERSAL: "universal";
+
+    interface NodeTypes {
+        tag: Tag,
+        string: String,
+        selector: Selector,
+        root: Root,
+        pseudo: Pseudo,
+        nesting: Nesting,
+        id: Identifier,
+        comment: Comment,
+        combinator: Combinator,
+        class: ClassName,
+        attribute: Attribute,
+        universal: Universal
+    }
+
+    type Node = NodeTypes[keyof NodeTypes];
+
+    function isNode(node: any): node is Node;
+
+    interface Options {
+        /**
+         * Preserve whitespace when true. Default: false;
+         */
+        lossless: boolean;
+        /**
+         * When true and a postcss.Rule is passed, set the result of
+         * processing back onto the rule when done. Default: false.
+         */
+        updateSelector: boolean;
+    }
+    class Processor<
+        TransformType = never,
+        SyncSelectorsType extends Selectors | never = Selectors
+    > {
+        res: Root;
+        readonly result: String;
+        ast(selectors: Selectors, options?: Partial<Options>): Promise<Root>;
+        astSync(selectors: SyncSelectorsType, options?: Partial<Options>): Root;
+        transform(selectors: Selectors, options?: Partial<Options>): Promise<TransformType>;
+        transformSync(selectors: SyncSelectorsType, options?: Partial<Options>): TransformType;
+        process(selectors: Selectors, options?: Partial<Options>): Promise<string>;
+        processSync(selectors: SyncSelectorsType, options?: Partial<Options>): string;
+    }
+    interface ParserOptions {
+        css: string;
+        error: (message: string, options: ErrorOptions) => Error;
+        options: Options;
+    }
+    class Parser {
+        input: ParserOptions;
+        lossy: boolean;
+        position: number;
+        root: Root;
+        selectors: string;
+        current: Selector;
+        constructor(input: ParserOptions);
+        /**
+         * Raises an error, if the processor is invoked on
+         * a postcss Rule node, a better error message is raised.
+         */
+        error(message: string, options?: ErrorOptions): void;
+    }
+    interface NodeSource {
+        start?: {
+            line: number,
+            column: number
+        },
+        end?: {
+            line: number,
+            column: number
+        }
+    }
+    interface SpaceAround {
+      before: string;
+      after: string;
+    }
+    interface Spaces extends SpaceAround {
+      [spaceType: string]: string | Partial<SpaceAround> | undefined;
+    }
+    interface NodeOptions<Value = string> {
+        value: Value;
+        spaces?: Partial<Spaces>;
+        source?: NodeSource;
+        sourceIndex?: number;
+    }
+    interface Base<
+        Value extends string | undefined = string,
+        ParentType extends Container | undefined = Container | undefined
+    > {
+        type: keyof NodeTypes;
+        parent: ParentType;
+        value: Value;
+        spaces: Spaces;
+        source?: NodeSource;
+        sourceIndex: number;
+        rawSpaceBefore: string;
+        rawSpaceAfter: string;
+        remove(): Node;
+        replaceWith(...nodes: Node[]): Node;
+        next(): Node | undefined;
+        prev(): Node | undefined;
+        clone(opts?: {[override: string]:any}): this;
+        /**
+         * Return whether this node includes the character at the position of the given line and column.
+         * Returns undefined if the nodes lack sufficient source metadata to determine the position.
+         * @param line 1-index based line number relative to the start of the selector.
+         * @param column 1-index based column number relative to the start of the selector.
+         */
+        isAtPosition(line: number, column: number): boolean | undefined;
+        /**
+         * Some non-standard syntax doesn't follow normal escaping rules for css,
+         * this allows the escaped value to be specified directly, allowing illegal characters to be
+         * directly inserted into css output.
+         * @param name the property to set
+         * @param value the unescaped value of the property
+         * @param valueEscaped optional. the escaped value of the property.
+         */
+        setPropertyAndEscape(name: string, value: any, valueEscaped: string): void;
+        /**
+         * When you want a value to passed through to CSS directly. This method
+         * deletes the corresponding raw value causing the stringifier to fallback
+         * to the unescaped value.
+         * @param name the property to set.
+         * @param value The value that is both escaped and unescaped.
+         */
+        setPropertyWithoutEscape(name: string, value: any): void;
+        /**
+         * Some non-standard syntax doesn't follow normal escaping rules for css.
+         * This allows non standard syntax to be appended to an existing property
+         * by specifying the escaped value. By specifying the escaped value,
+         * illegal characters are allowed to be directly inserted into css output.
+         * @param {string} name the property to set
+         * @param {any} value the unescaped value of the property
+         * @param {string} valueEscaped optional. the escaped value of the property.
+         */
+        appendToPropertyAndEscape(name: string, value: any, valueEscaped: string): void;
+        toString(): string;
+    }
+    interface ContainerOptions extends NodeOptions {
+        nodes?: Array<Node>;
+    }
+    interface Container<
+        Value extends string | undefined = string,
+        Child extends Node = Node
+    > extends Base<Value> {
+        nodes: Array<Child>;
+        append(selector: Child): this;
+        prepend(selector: Child): this;
+        at(index: number): Child;
+        /**
+         * Return the most specific node at the line and column number given.
+         * The source location is based on the original parsed location, locations aren't
+         * updated as selector nodes are mutated.
+         *
+         * Note that this location is relative to the location of the first character
+         * of the selector, and not the location of the selector in the overall document
+         * when used in conjunction with postcss.
+         *
+         * If not found, returns undefined.
+         * @param line The line number of the node to find. (1-based index)
+         * @param col  The column number of the node to find. (1-based index)
+         */
+        atPosition(line: number, column: number): Child;
+        index(child: Child): number;
+        readonly first: Child;
+        readonly last: Child;
+        readonly length: number;
+        removeChild(child: Child): this;
+        removeAll(): this;
+        empty(): this;
+        insertAfter(oldNode: Child, newNode: Child): this;
+        insertBefore(oldNode: Child, newNode: Child): this;
+        each(callback: (node: Child, index: number) => boolean | void): boolean | undefined;
+        walk(
+            callback: (node: Node, index: number) => boolean | void
+        ): boolean | undefined;
+        walkAttributes(
+            callback: (node: Attribute) => boolean | void
+        ): boolean | undefined;
+        walkClasses(
+            callback: (node: ClassName) => boolean | void
+        ): boolean | undefined;
+        walkCombinators(
+            callback: (node: Combinator) => boolean | void
+        ): boolean | undefined;
+        walkComments(
+            callback: (node: Comment) => boolean | void
+        ): boolean | undefined;
+        walkIds(
+            callback: (node: Identifier) => boolean | void
+        ): boolean | undefined;
+        walkNesting(
+            callback: (node: Nesting) => boolean | void
+        ): boolean | undefined;
+        walkPseudos(
+            callback: (node: Pseudo) => boolean | void
+        ): boolean | undefined;
+        walkTags(callback: (node: Tag) => boolean | void): boolean | undefined;
+        split(callback: (node: Child) => boolean): [Child[], Child[]];
+        map<T>(callback: (node: Child) => T): T[];
+        reduce(
+            callback: (
+                previousValue: Child,
+                currentValue: Child,
+                currentIndex: number,
+                array: readonly Child[]
+            ) => Child
+        ): Child;
+        reduce(
+            callback: (
+                previousValue: Child,
+                currentValue: Child,
+                currentIndex: number,
+                array: readonly Child[]
+            ) => Child,
+            initialValue: Child
+        ): Child;
+        reduce<T>(
+            callback: (
+                previousValue: T,
+                currentValue: Child,
+                currentIndex: number,
+                array: readonly Child[]
+            ) => T,
+            initialValue: T
+        ): T;
+        every(callback: (node: Child) => boolean): boolean;
+        some(callback: (node: Child) => boolean): boolean;
+        filter(callback: (node: Child) => boolean): Child[];
+        sort(callback: (nodeA: Child, nodeB: Child) => number): Child[];
+        toString(): string;
+    }
+    function isContainer(node: any): node is Root | Selector | Pseudo;
+
+    interface NamespaceOptions<Value extends string | undefined = string> extends NodeOptions<Value> {
+        namespace?: string | true;
+    }
+    interface Namespace<Value extends string | undefined = string> extends Base<Value> {
+        /** alias for namespace */
+        ns: string | true;
+        /**
+         *  namespace prefix.
+         */
+        namespace: string | true;
+        /**
+         * If a namespace exists, prefix the value provided with it, separated by |.
+         */
+        qualifiedName(value: string): string;
+        /**
+         * A string representing the namespace suitable for output.
+         */
+        readonly namespaceString: string;
+    }
+    function isNamespace(node: any): node is Attribute | Tag;
+
+    interface Root extends Container<undefined, Selector> {
+        type: "root";
+        /**
+         * Raises an error, if the processor is invoked on
+         * a postcss Rule node, a better error message is raised.
+         */
+        error(message: string, options?: ErrorOptions): Error;
+        nodeAt(line: number, column: number): Node
+    }
+    function root(opts: ContainerOptions): Root;
+    function isRoot(node: any): node is Root;
+
+    interface _Selector<S> extends Container<string, Diff<Node, S>> {
+        type: "selector";
+    }
+    type Selector = _Selector<Selector>;
+    function selector(opts: ContainerOptions): Selector;
+    function isSelector(node: any): node is Selector;
+
+    interface CombinatorRaws {
+        value?: string;
+        spaces?: {
+            before?: string;
+            after?: string;
+        };
+    }
+    interface Combinator extends Base {
+        type: "combinator";
+        raws?: CombinatorRaws;
+    }
+    function combinator(opts: NodeOptions): Combinator;
+    function isCombinator(node: any): node is Combinator;
+
+    interface ClassName extends Base {
+        type: "class";
+    }
+    function className(opts: NamespaceOptions): ClassName;
+    function isClassName(node: any): node is ClassName;
+
+    type AttributeOperator = "=" | "~=" | "|=" | "^=" | "$=" | "*=";
+    type QuoteMark = '"' | "'" | null;
+    interface PreferredQuoteMarkOptions {
+        quoteMark?: QuoteMark;
+        preferCurrentQuoteMark?: boolean;
+    }
+    interface SmartQuoteMarkOptions extends PreferredQuoteMarkOptions {
+        smart?: boolean;
+    }
+    interface AttributeOptions extends NamespaceOptions<string | undefined> {
+        attribute: string;
+        operator?: AttributeOperator;
+        insensitive?: boolean;
+        quoteMark?: QuoteMark;
+        /** @deprecated Use quoteMark instead. */
+        quoted?: boolean;
+        spaces?: {
+            before?: string;
+            after?: string;
+            attribute?: Partial<SpaceAround>;
+            operator?: Partial<SpaceAround>;
+            value?: Partial<SpaceAround>;
+            insensitive?: Partial<SpaceAround>;
+        }
+        raws: {
+            unquoted?: string;
+            attribute?: string;
+            operator?: string;
+            value?: string;
+            insensitive?: string;
+            spaces?: {
+                attribute?: Partial<Spaces>;
+                operator?: Partial<Spaces>;
+                value?: Partial<Spaces>;
+                insensitive?: Partial<Spaces>;
+            }
+        };
+    }
+    interface Attribute extends Namespace<string | undefined> {
+        type: "attribute";
+        attribute: string;
+        operator?: AttributeOperator;
+        insensitive?: boolean;
+        quoteMark: QuoteMark;
+        quoted?: boolean;
+        spaces: {
+            before: string;
+            after: string;
+            attribute?: Partial<Spaces>;
+            operator?: Partial<Spaces>;
+            value?: Partial<Spaces>;
+            insensitive?: Partial<Spaces>;
+        }
+        raws: {
+            /** @deprecated The attribute value is unquoted, use that instead.. */
+            unquoted?: string;
+            attribute?: string;
+            operator?: string;
+            /** The value of the attribute with quotes and escapes. */
+            value?: string;
+            insensitive?: string;
+            spaces?: {
+                attribute?: Partial<Spaces>;
+                operator?: Partial<Spaces>;
+                value?: Partial<Spaces>;
+                insensitive?: Partial<Spaces>;
+            }
+        };
+        /**
+         * The attribute name after having been qualified with a namespace.
+         */
+        readonly qualifiedAttribute: string;
+
+        /**
+         * The case insensitivity flag or an empty string depending on whether this
+         * attribute is case insensitive.
+         */
+        readonly insensitiveFlag : 'i' | '';
+
+        /**
+         * Returns the attribute's value quoted such that it would be legal to use
+         * in the value of a css file. The original value's quotation setting
+         * used for stringification is left unchanged. See `setValue(value, options)`
+         * if you want to control the quote settings of a new value for the attribute or
+         * `set quoteMark(mark)` if you want to change the quote settings of the current
+         * value.
+         *
+         * You can also change the quotation used for the current value by setting quoteMark.
+         **/
+        getQuotedValue(options?: SmartQuoteMarkOptions): string;
+
+        /**
+         * Set the unescaped value with the specified quotation options. The value
+         * provided must not include any wrapping quote marks -- those quotes will
+         * be interpreted as part of the value and escaped accordingly.
+         * @param value
+         */
+        setValue(value: string, options?: SmartQuoteMarkOptions): void;
+
+        /**
+         * Intelligently select a quoteMark value based on the value's contents. If
+         * the value is a legal CSS ident, it will not be quoted. Otherwise a quote
+         * mark will be picked that minimizes the number of escapes.
+         *
+         * If there's no clear winner, the quote mark from these options is used,
+         * then the source quote mark (this is inverted if `preferCurrentQuoteMark` is
+         * true). If the quoteMark is unspecified, a double quote is used.
+         **/
+        smartQuoteMark(options: PreferredQuoteMarkOptions): QuoteMark;
+
+        /**
+         * Selects the preferred quote mark based on the options and the current quote mark value.
+         * If you want the quote mark to depend on the attribute value, call `smartQuoteMark(opts)`
+         * instead.
+         */
+        preferredQuoteMark(options: PreferredQuoteMarkOptions): QuoteMark
+
+        /**
+         * returns the offset of the attribute part specified relative to the
+         * start of the node of the output string.
+         *
+         * * "ns" - alias for "namespace"
+         * * "namespace" - the namespace if it exists.
+         * * "attribute" - the attribute name
+         * * "attributeNS" - the start of the attribute or its namespace
+         * * "operator" - the match operator of the attribute
+         * * "value" - The value (string or identifier)
+         * * "insensitive" - the case insensitivity flag;
+         * @param part One of the possible values inside an attribute.
+         * @returns -1 if the name is invalid or the value doesn't exist in this attribute.
+         */
+        offsetOf(part: "ns" | "namespace" | "attribute" | "attributeNS" | "operator" | "value" | "insensitive"): number;
+    }
+    function attribute(opts: AttributeOptions): Attribute;
+    function isAttribute(node: any): node is Attribute;
+
+    interface Pseudo extends Container<string, Selector> {
+        type: "pseudo";
+    }
+    function pseudo(opts: ContainerOptions): Pseudo;
+    /**
+     * Checks whether the node is the Pseudo subtype of node.
+     */
+    function isPseudo(node: any): node is Pseudo;
+
+    /**
+     * Checks whether the node is, specifically, a pseudo element instead of
+     * pseudo class.
+     */
+    function isPseudoElement(node: any): node is Pseudo;
+
+    /**
+     * Checks whether the node is, specifically, a pseudo class instead of
+     * pseudo element.
+     */
+    function isPseudoClass(node: any): node is Pseudo;
+
+
+    interface Tag extends Namespace {
+        type: "tag";
+    }
+    function tag(opts: NamespaceOptions): Tag;
+    function isTag(node: any): node is Tag;
+
+    interface Comment extends Base {
+        type: "comment";
+    }
+    function comment(opts: NodeOptions): Comment;
+    function isComment(node: any): node is Comment;
+
+    interface Identifier extends Base {
+        type: "id";
+    }
+    function id(opts: any): Identifier;
+    function isIdentifier(node: any): node is Identifier;
+
+    interface Nesting extends Base {
+        type: "nesting";
+    }
+    function nesting(opts?: any): Nesting;
+    function isNesting(node: any): node is Nesting;
+
+    interface String extends Base {
+        type: "string";
+    }
+    function string(opts: NodeOptions): String;
+    function isString(node: any): node is String;
+
+    interface Universal extends Base {
+        type: "universal";
+    }
+    function universal(opts?: NamespaceOptions): Universal;
+    function isUniversal(node: any): node is Universal;
+}