Index: node_modules/postcss/lib/container.js
===================================================================
--- node_modules/postcss/lib/container.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/postcss/lib/container.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,447 @@
+'use strict'
+
+let Comment = require('./comment')
+let Declaration = require('./declaration')
+let Node = require('./node')
+let { isClean, my } = require('./symbols')
+
+let AtRule, parse, Root, Rule
+
+function cleanSource(nodes) {
+  return nodes.map(i => {
+    if (i.nodes) i.nodes = cleanSource(i.nodes)
+    delete i.source
+    return i
+  })
+}
+
+function markTreeDirty(node) {
+  node[isClean] = false
+  if (node.proxyOf.nodes) {
+    for (let i of node.proxyOf.nodes) {
+      markTreeDirty(i)
+    }
+  }
+}
+
+class Container extends Node {
+  get first() {
+    if (!this.proxyOf.nodes) return undefined
+    return this.proxyOf.nodes[0]
+  }
+
+  get last() {
+    if (!this.proxyOf.nodes) return undefined
+    return this.proxyOf.nodes[this.proxyOf.nodes.length - 1]
+  }
+
+  append(...children) {
+    for (let child of children) {
+      let nodes = this.normalize(child, this.last)
+      for (let node of nodes) this.proxyOf.nodes.push(node)
+    }
+
+    this.markDirty()
+
+    return this
+  }
+
+  cleanRaws(keepBetween) {
+    super.cleanRaws(keepBetween)
+    if (this.nodes) {
+      for (let node of this.nodes) node.cleanRaws(keepBetween)
+    }
+  }
+
+  each(callback) {
+    if (!this.proxyOf.nodes) return undefined
+    let iterator = this.getIterator()
+
+    let index, result
+    while (this.indexes[iterator] < this.proxyOf.nodes.length) {
+      index = this.indexes[iterator]
+      result = callback(this.proxyOf.nodes[index], index)
+      if (result === false) break
+
+      this.indexes[iterator] += 1
+    }
+
+    delete this.indexes[iterator]
+    return result
+  }
+
+  every(condition) {
+    return this.nodes.every(condition)
+  }
+
+  getIterator() {
+    if (!this.lastEach) this.lastEach = 0
+    if (!this.indexes) this.indexes = {}
+
+    this.lastEach += 1
+    let iterator = this.lastEach
+    this.indexes[iterator] = 0
+
+    return iterator
+  }
+
+  getProxyProcessor() {
+    return {
+      get(node, prop) {
+        if (prop === 'proxyOf') {
+          return node
+        } else if (!node[prop]) {
+          return node[prop]
+        } else if (
+          prop === 'each' ||
+          (typeof prop === 'string' && prop.startsWith('walk'))
+        ) {
+          return (...args) => {
+            return node[prop](
+              ...args.map(i => {
+                if (typeof i === 'function') {
+                  return (child, index) => i(child.toProxy(), index)
+                } else {
+                  return i
+                }
+              })
+            )
+          }
+        } else if (prop === 'every' || prop === 'some') {
+          return cb => {
+            return node[prop]((child, ...other) =>
+              cb(child.toProxy(), ...other)
+            )
+          }
+        } else if (prop === 'root') {
+          return () => node.root().toProxy()
+        } else if (prop === 'nodes') {
+          return node.nodes.map(i => i.toProxy())
+        } else if (prop === 'first' || prop === 'last') {
+          return node[prop].toProxy()
+        } else {
+          return node[prop]
+        }
+      },
+
+      set(node, prop, value) {
+        if (node[prop] === value) return true
+        node[prop] = value
+        if (prop === 'name' || prop === 'params' || prop === 'selector') {
+          node.markDirty()
+        }
+        return true
+      }
+    }
+  }
+
+  index(child) {
+    if (typeof child === 'number') return child
+    if (child.proxyOf) child = child.proxyOf
+    return this.proxyOf.nodes.indexOf(child)
+  }
+
+  insertAfter(exist, add) {
+    let existIndex = this.index(exist)
+    let nodes = this.normalize(add, this.proxyOf.nodes[existIndex]).reverse()
+    existIndex = this.index(exist)
+    for (let node of nodes) this.proxyOf.nodes.splice(existIndex + 1, 0, node)
+
+    let index
+    for (let id in this.indexes) {
+      index = this.indexes[id]
+      if (existIndex < index) {
+        this.indexes[id] = index + nodes.length
+      }
+    }
+
+    this.markDirty()
+
+    return this
+  }
+
+  insertBefore(exist, add) {
+    let existIndex = this.index(exist)
+    let type = existIndex === 0 ? 'prepend' : false
+    let nodes = this.normalize(
+      add,
+      this.proxyOf.nodes[existIndex],
+      type
+    ).reverse()
+    existIndex = this.index(exist)
+    for (let node of nodes) this.proxyOf.nodes.splice(existIndex, 0, node)
+
+    let index
+    for (let id in this.indexes) {
+      index = this.indexes[id]
+      if (existIndex <= index) {
+        this.indexes[id] = index + nodes.length
+      }
+    }
+
+    this.markDirty()
+
+    return this
+  }
+
+  normalize(nodes, sample) {
+    if (typeof nodes === 'string') {
+      nodes = cleanSource(parse(nodes).nodes)
+    } else if (typeof nodes === 'undefined') {
+      nodes = []
+    } else if (Array.isArray(nodes)) {
+      nodes = nodes.slice(0)
+      for (let i of nodes) {
+        if (i.parent) i.parent.removeChild(i, 'ignore')
+      }
+    } else if (nodes.type === 'root' && this.type !== 'document') {
+      nodes = nodes.nodes.slice(0)
+      for (let i of nodes) {
+        if (i.parent) i.parent.removeChild(i, 'ignore')
+      }
+    } else if (nodes.type) {
+      nodes = [nodes]
+    } else if (nodes.prop) {
+      if (typeof nodes.value === 'undefined') {
+        throw new Error('Value field is missed in node creation')
+      } else if (typeof nodes.value !== 'string') {
+        nodes.value = String(nodes.value)
+      }
+      nodes = [new Declaration(nodes)]
+    } else if (nodes.selector || nodes.selectors) {
+      nodes = [new Rule(nodes)]
+    } else if (nodes.name) {
+      nodes = [new AtRule(nodes)]
+    } else if (nodes.text) {
+      nodes = [new Comment(nodes)]
+    } else {
+      throw new Error('Unknown node type in node creation')
+    }
+
+    let processed = nodes.map(i => {
+      /* c8 ignore next */
+      if (!i[my]) Container.rebuild(i)
+      i = i.proxyOf
+      if (i.parent) i.parent.removeChild(i)
+      if (i[isClean]) markTreeDirty(i)
+
+      if (!i.raws) i.raws = {}
+      if (typeof i.raws.before === 'undefined') {
+        if (sample && typeof sample.raws.before !== 'undefined') {
+          i.raws.before = sample.raws.before.replace(/\S/g, '')
+        }
+      }
+      i.parent = this.proxyOf
+      return i
+    })
+
+    return processed
+  }
+
+  prepend(...children) {
+    children = children.reverse()
+    for (let child of children) {
+      let nodes = this.normalize(child, this.first, 'prepend').reverse()
+      for (let node of nodes) this.proxyOf.nodes.unshift(node)
+      for (let id in this.indexes) {
+        this.indexes[id] = this.indexes[id] + nodes.length
+      }
+    }
+
+    this.markDirty()
+
+    return this
+  }
+
+  push(child) {
+    child.parent = this
+    this.proxyOf.nodes.push(child)
+    return this
+  }
+
+  removeAll() {
+    for (let node of this.proxyOf.nodes) node.parent = undefined
+    this.proxyOf.nodes = []
+
+    this.markDirty()
+
+    return this
+  }
+
+  removeChild(child) {
+    child = this.index(child)
+    this.proxyOf.nodes[child].parent = undefined
+    this.proxyOf.nodes.splice(child, 1)
+
+    let index
+    for (let id in this.indexes) {
+      index = this.indexes[id]
+      if (index >= child) {
+        this.indexes[id] = index - 1
+      }
+    }
+
+    this.markDirty()
+
+    return this
+  }
+
+  replaceValues(pattern, opts, callback) {
+    if (!callback) {
+      callback = opts
+      opts = {}
+    }
+
+    this.walkDecls(decl => {
+      if (opts.props && !opts.props.includes(decl.prop)) return
+      if (opts.fast && !decl.value.includes(opts.fast)) return
+
+      decl.value = decl.value.replace(pattern, callback)
+    })
+
+    this.markDirty()
+
+    return this
+  }
+
+  some(condition) {
+    return this.nodes.some(condition)
+  }
+
+  walk(callback) {
+    return this.each((child, i) => {
+      let result
+      try {
+        result = callback(child, i)
+      } catch (e) {
+        throw child.addToError(e)
+      }
+      if (result !== false && child.walk) {
+        result = child.walk(callback)
+      }
+
+      return result
+    })
+  }
+
+  walkAtRules(name, callback) {
+    if (!callback) {
+      callback = name
+      return this.walk((child, i) => {
+        if (child.type === 'atrule') {
+          return callback(child, i)
+        }
+      })
+    }
+    if (name instanceof RegExp) {
+      return this.walk((child, i) => {
+        if (child.type === 'atrule' && name.test(child.name)) {
+          return callback(child, i)
+        }
+      })
+    }
+    return this.walk((child, i) => {
+      if (child.type === 'atrule' && child.name === name) {
+        return callback(child, i)
+      }
+    })
+  }
+
+  walkComments(callback) {
+    return this.walk((child, i) => {
+      if (child.type === 'comment') {
+        return callback(child, i)
+      }
+    })
+  }
+
+  walkDecls(prop, callback) {
+    if (!callback) {
+      callback = prop
+      return this.walk((child, i) => {
+        if (child.type === 'decl') {
+          return callback(child, i)
+        }
+      })
+    }
+    if (prop instanceof RegExp) {
+      return this.walk((child, i) => {
+        if (child.type === 'decl' && prop.test(child.prop)) {
+          return callback(child, i)
+        }
+      })
+    }
+    return this.walk((child, i) => {
+      if (child.type === 'decl' && child.prop === prop) {
+        return callback(child, i)
+      }
+    })
+  }
+
+  walkRules(selector, callback) {
+    if (!callback) {
+      callback = selector
+
+      return this.walk((child, i) => {
+        if (child.type === 'rule') {
+          return callback(child, i)
+        }
+      })
+    }
+    if (selector instanceof RegExp) {
+      return this.walk((child, i) => {
+        if (child.type === 'rule' && selector.test(child.selector)) {
+          return callback(child, i)
+        }
+      })
+    }
+    return this.walk((child, i) => {
+      if (child.type === 'rule' && child.selector === selector) {
+        return callback(child, i)
+      }
+    })
+  }
+}
+
+Container.registerParse = dependant => {
+  parse = dependant
+}
+
+Container.registerRule = dependant => {
+  Rule = dependant
+}
+
+Container.registerAtRule = dependant => {
+  AtRule = dependant
+}
+
+Container.registerRoot = dependant => {
+  Root = dependant
+}
+
+module.exports = Container
+Container.default = Container
+
+/* c8 ignore start */
+Container.rebuild = node => {
+  if (node.type === 'atrule') {
+    Object.setPrototypeOf(node, AtRule.prototype)
+  } else if (node.type === 'rule') {
+    Object.setPrototypeOf(node, Rule.prototype)
+  } else if (node.type === 'decl') {
+    Object.setPrototypeOf(node, Declaration.prototype)
+  } else if (node.type === 'comment') {
+    Object.setPrototypeOf(node, Comment.prototype)
+  } else if (node.type === 'root') {
+    Object.setPrototypeOf(node, Root.prototype)
+  }
+
+  node[my] = true
+
+  if (node.nodes) {
+    node.nodes.forEach(child => {
+      Container.rebuild(child)
+    })
+  }
+}
+/* c8 ignore stop */