Index: trip-planner-front/node_modules/critters/src/index2.js
===================================================================
--- trip-planner-front/node_modules/critters/src/index2.js	(revision 6a3a178323fd905112b5392bd9d3cb83b66ef2d3)
+++ trip-planner-front/node_modules/critters/src/index2.js	(revision 6a3a178323fd905112b5392bd9d3cb83b66ef2d3)
@@ -0,0 +1,672 @@
+/**
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+import path from 'path';
+import postcss from 'postcss';
+import cssnano from 'cssnano';
+import prettyBytes from 'pretty-bytes';
+import { createDocument, serializeDocument } from './dom';
+import {
+  parseStylesheet,
+  serializeStylesheet,
+  walkStyleRules,
+  walkStyleRulesWithReverseMirror,
+  markOnly,
+  applyMarkedSelectors,
+} from './css';
+import { logger } from './util';
+
+/**
+ * The mechanism to use for lazy-loading stylesheets.
+ * _[JS]_ indicates that a strategy requires JavaScript (falls back to `<noscript>`).
+ *
+ * - **default:** Move stylesheet links to the end of the document and insert preload meta tags in their place.
+ * - **"body":** Move all external stylesheet links to the end of the document.
+ * - **"media":** Load stylesheets asynchronously by adding `media="not x"` and removing once loaded. _[JS]_
+ * - **"swap":** Convert stylesheet links to preloads that swap to `rel="stylesheet"` once loaded. _[JS]_
+ * - **"js":** Inject an asynchronous CSS loader similar to [LoadCSS](https://github.com/filamentgroup/loadCSS) and use it to load stylesheets. _[JS]_
+ * - **"js-lazy":** Like `"js"`, but the stylesheet is disabled until fully loaded.
+ * @typedef {(default|'body'|'media'|'swap'|'js'|'js-lazy')} PreloadStrategy
+ * @public
+ */
+
+/**
+ * Controls which keyframes rules are inlined.
+ *
+ * - **"critical":** _(default)_ inline keyframes rules that are used by the critical CSS.
+ * - **"all":** Inline all keyframes rules.
+ * - **"none":** Remove all keyframes rules.
+ * @typedef {('critical'|'all'|'none')} KeyframeStrategy
+ * @private
+ * @property {String} keyframes     Which {@link KeyframeStrategy keyframe strategy} to use (default: `critical`)_
+ */
+
+/**
+ * Controls log level of the plugin. Specifies the level the logger should use. A logger will
+ * not produce output for any log level beneath the specified level. Available levels and order
+ * are:
+ *
+ * - **"info"** _(default)_
+ * - **"warn"**
+ * - **"error"**
+ * - **"trace"**
+ * - **"debug"**
+ * - **"silent"**
+ * @typedef {('info'|'warn'|'error'|'trace'|'debug'|'silent')} LogLevel
+ * @public
+ */
+
+/**
+ * All optional. Pass them to `new Critters({ ... })`.
+ * @public
+ * @typedef Options
+ * @property {Boolean} external     Inline styles from external stylesheets _(default: `true`)_
+ * @property {Number} inlineThreshold Inline external stylesheets smaller than a given size _(default: `0`)_
+ * @property {Number} minimumExternalSize If the non-critical external stylesheet would be below this size, just inline it _(default: `0`)_
+ * @property {Boolean} pruneSource  Remove inlined rules from the external stylesheet _(default: `false`)_
+ * @property {Boolean} mergeStylesheets Merged inlined stylesheets into a single <style> tag _(default: `true`)_
+ * @property {String[]} additionalStylesheets Glob for matching other stylesheets to be used while looking for critical CSS _(default: ``)_.
+ * @property {String} preload       Which {@link PreloadStrategy preload strategy} to use
+ * @property {Boolean} noscriptFallback Add `<noscript>` fallback to JS-based strategies
+ * @property {Boolean} inlineFonts  Inline critical font-face rules _(default: `false`)_
+ * @property {Boolean} preloadFonts Preloads critical fonts _(default: `true`)_
+ * @property {Boolean} fonts        Shorthand for setting `inlineFonts`+`preloadFonts`
+ *  - Values:
+ *  - `true` to inline critical font-face rules and preload the fonts
+ *  - `false` to don't inline any font-face rules and don't preload fonts
+ * @property {String} keyframes     Controls which keyframes rules are inlined.
+ *  - Values:
+ *  - `"critical"`: _(default)_ inline keyframes rules used by the critical CSS
+ *  - `"all"` inline all keyframes rules
+ *  - `"none"` remove all keyframes rules
+ * @property {Boolean} compress     Compress resulting critical CSS _(default: `true`)_
+ * @property {String} logLevel      Controls {@link LogLevel log level} of the plugin _(default: `"info"`)_
+ */
+
+export default class Critters {
+  /** @private */
+  constructor(options) {
+    this.options = Object.assign(
+      {
+        logLevel: 'info',
+        externalStylesheets: [],
+        outputPath: '',
+        publicPath: '',
+        reduceInlineStyles: true,
+        pruneSource: false,
+        additionalStylesheets: [],
+        ssrMode: false,
+      },
+      options || {}
+    );
+
+    this.urlFilter = this.options.filter;
+    if (this.urlFilter instanceof RegExp) {
+      this.urlFilter = this.urlFilter.test.bind(this.urlFilter);
+    }
+
+    this.logger = this.options.logger || logger;
+  }
+
+  /**
+   * Read the contents of a file from the specified filesystem or disk
+   */
+  readFile(filename) {
+    const fs = this.fs;
+    return new Promise((resolve, reject) => {
+      const callback = (err, data) => {
+        if (err) reject(err);
+        else resolve(data);
+      };
+      if (fs && fs.readFile) {
+        fs.readFile(filename, callback);
+      } else {
+        require('fs').readFile(filename, 'utf8', callback);
+      }
+    });
+  }
+
+  /**
+   * Apply critical CSS processing to the html
+   */
+  async process(html) {
+    // const start = process.hrtime.bigint();
+    console.time('critters');
+
+    // Parse the generated HTML in a DOM we can mutate
+    // console.time('createDoc');
+    const document = createDocument(html);
+    // console.timeEnd('createDoc');
+
+    if (this.options.additionalStylesheets.length > 0) {
+      this.embedAdditionalStylesheet(document);
+    }
+
+    // `external:false` skips processing of external sheets
+    if (this.options.external !== false) {
+      // console.time('externalSheets');
+      const externalSheets = [].slice.call(
+        document.querySelectorAll('link[rel="stylesheet"]')
+      );
+      // console.timeEnd('externalSheets');
+      // console.time('embedLinkedStylesheet');
+      await Promise.all(
+        externalSheets.map((link) => this.embedLinkedStylesheet(link))
+      );
+      // console.timeEnd('embedLinkedStylesheet');
+    }
+
+    // go through all the style tags in the document and reduce them to only critical CSS
+    // console.time('getAffectedStyleTags');
+    const styles = this.getAffectedStyleTags(document);
+    // console.timeEnd('getAffectedStyleTags');
+
+    // console.time('processStyle');
+    await Promise.all(
+      styles.map((style) => this.processStyle(style, document))
+    );
+    // console.timeEnd('processStyle');
+
+    if (this.options.mergeStylesheets !== false && styles.length !== 0) {
+      // console.time('mergeStylesheets');
+      await this.mergeStylesheets(document);
+      // console.timeEnd('mergeStylesheets');
+    }
+
+    // serialize the document back to HTML and we're done
+    // console.time('serializeDocument');
+    const output = serializeDocument(document);
+    // console.timeEnd('serializeDocument');
+    // const end = process.hrtime.bigint();
+    // console.log(`Time ${(end - start) / 1e6}`);
+    console.timeEnd('critters');
+    return output;
+  }
+
+  /**
+   * Get the style tags that need processing
+   */
+  getAffectedStyleTags(document) {
+    const styles = [].slice.call(document.querySelectorAll('style'));
+
+    // `inline:false` skips processing of inline stylesheets
+    if (this.options.reduceInlineStyles === false) {
+      return styles.filter((style) => style.$$external);
+    }
+    return styles;
+  }
+
+  async mergeStylesheets(document) {
+    const styles = this.getAffectedStyleTags(document);
+    if (styles.length === 0) {
+      this.logger.warn(
+        'Merging inline stylesheets into a single <style> tag skipped, no inline stylesheets to merge'
+      );
+      return;
+    }
+    const first = styles[0];
+    let sheet = first.textContent;
+    // console.log(sheet);
+    for (let i = 1; i < styles.length; i++) {
+      const node = styles[i];
+      // sheet.children.push(...node.children);
+      sheet += node.textContent;
+      // console.log(node);
+      // node.parent.children.splice(node.parent.children.indexOf(node), 1);
+      node.remove();
+    }
+    if (!this.options.ssrMode && this.options.compress !== false) {
+      const before = sheet;
+      const processor = postcss([cssnano()]);
+      const result = await processor.process(before, { from: undefined });
+      // @todo sourcemap support (elsewhere first)
+      sheet = result.css;
+    }
+    // setNodeText(first, sheet);
+    first.textContent = sheet;
+  }
+
+  /**
+   * Given href, find the corresponding CSS asset
+   */
+  async getCssAsset(href) {
+    const outputPath = this.options.outputPath;
+    const publicPath = this.options.publicPath;
+
+    // CHECK - the output path
+    // path on disk (with output.publicPath removed)
+    let normalizedPath = href.replace(/^\//, '');
+    const pathPrefix = (publicPath || '').replace(/(^\/|\/$)/g, '') + '/';
+    if (normalizedPath.indexOf(pathPrefix) === 0) {
+      normalizedPath = normalizedPath
+        .substring(pathPrefix.length)
+        .replace(/^\//, '');
+    }
+    const filename = path.resolve(outputPath, normalizedPath);
+
+    // // try to find a matching asset by filename in webpack's output (not yet written to disk)
+    // const relativePath = path
+    //   .relative(outputPath, filename)
+    //   .replace(/^\.\//, '');
+    // const asset = ''; // compilation.assets[relativePath];
+
+    // // console.log('filename ', filename);
+    // // Attempt to read from assets, falling back to a disk read
+    // let sheet = asset && asset.source();
+
+    let sheet;
+
+    try {
+      sheet = await this.readFile(filename);
+      // this.logger.warn(
+      //   `Stylesheet "${relativePath}" not found in assets, but a file was located on disk.${
+      //     this.options.pruneSource
+      //       ? ' This means pruneSource will not be applied.'
+      //       : ''
+      //   }`
+      // );
+    } catch (e) {
+      this.logger.warn(`Unable to locate stylesheet: ${filename}`);
+    }
+
+    return sheet;
+  }
+
+  checkInlineThreshold(link, style, sheet) {
+    if (
+      this.options.inlineThreshold &&
+      sheet.length < this.options.inlineThreshold
+    ) {
+      const href = style.$$name;
+      style.$$reduce = false;
+      this.logger.info(
+        `\u001b[32mInlined all of ${href} (${sheet.length} was below the threshold of ${this.options.inlineThreshold})\u001b[39m`
+      );
+      // if (asset) {
+      //   delete compilation.assets[relativePath];
+      // } else {
+      //   this.logger.warn(
+      //     `  > ${href} was not found in assets. the resource may still be emitted but will be unreferenced.`
+      //   );
+      // }
+      link.remove();
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Inline the stylesheets from options.additionalStylesheets (assuming it passes `options.filter`)
+   */
+  async embedAdditionalStylesheet(document) {
+    const styleSheetsIncluded = [];
+
+    const sources = await Promise.all(
+      this.options.additionalStylesheets.map((cssFile) => {
+        if (styleSheetsIncluded.includes(cssFile)) {
+          return;
+        }
+        styleSheetsIncluded.push(cssFile);
+        const style = document.createElement('style');
+        style.$$external = true;
+        return this.getCssAsset(cssFile, style).then((sheet) => [sheet, style]);
+      })
+    );
+
+    sources.forEach(([sheet, style]) => {
+      if (!sheet) return;
+      style.textContent = sheet;
+      document.head.appendChild(style);
+    });
+  }
+
+  /**
+   * Inline the target stylesheet referred to by a <link rel="stylesheet"> (assuming it passes `options.filter`)
+   */
+  async embedLinkedStylesheet(link) {
+    const href = link.getAttribute('href');
+    const media = link.getAttribute('media');
+    const document = link.ownerDocument;
+
+    const preloadMode = this.options.preload;
+
+    // skip filtered resources, or network resources if no filter is provided
+    // if (this.urlFilter ? this.urlFilter(href) : href.match(/^(https?:)?\/\//)) {
+    if (this.urlFilter ? this.urlFilter(href) : !(href || '').match(/\.css$/)) {
+      return Promise.resolve();
+    }
+
+    // the reduced critical CSS gets injected into a new <style> tag
+    const style = document.createElement('style');
+    style.$$external = true;
+    const sheet = await this.getCssAsset(href, style);
+
+    if (!sheet) {
+      return;
+    }
+
+    // style.appendChild(document.createTextNode(sheet));
+    style.textContent = sheet;
+    // style.innerHTML = sheet;
+    style.$$name = href;
+    style.$$links = [link];
+    link.parentNode.insertBefore(style, link);
+
+    if (this.checkInlineThreshold(link, style, sheet)) {
+      return;
+    }
+
+    // CSS loader is only injected for the first sheet, then this becomes an empty string
+    let cssLoaderPreamble =
+      "function $loadcss(u,m,l){(l=document.createElement('link')).rel='stylesheet';l.href=u;document.head.appendChild(l)}";
+    const lazy = preloadMode === 'js-lazy';
+    if (lazy) {
+      cssLoaderPreamble = cssLoaderPreamble.replace(
+        'l.href',
+        "l.media='print';l.onload=function(){l.media=m};l.href"
+      );
+    }
+
+    // Allow disabling any mutation of the stylesheet link:
+    if (preloadMode === false) return;
+
+    let noscriptFallback = false;
+
+    if (preloadMode === 'body') {
+      document.body.appendChild(link);
+    } else {
+      link.setAttribute('rel', 'preload');
+      link.setAttribute('as', 'style');
+      if (preloadMode === 'js' || preloadMode === 'js-lazy') {
+        const script = document.createElement('script');
+        const js = `${cssLoaderPreamble}$loadcss(${JSON.stringify(href)}${
+          lazy ? ',' + JSON.stringify(media || 'all') : ''
+        })`;
+        // script.appendChild(document.createTextNode(js));
+        script.textContent = js;
+        link.parentNode.insertBefore(script, link.nextSibling);
+        style.$$links.push(script);
+        cssLoaderPreamble = '';
+        noscriptFallback = true;
+      } else if (preloadMode === 'media') {
+        // @see https://github.com/filamentgroup/loadCSS/blob/af1106cfe0bf70147e22185afa7ead96c01dec48/src/loadCSS.js#L26
+        link.setAttribute('rel', 'stylesheet');
+        link.removeAttribute('as');
+        link.setAttribute('media', 'print');
+        link.setAttribute('onload', `this.media='${media || 'all'}'`);
+        noscriptFallback = true;
+      } else if (preloadMode === 'swap') {
+        link.setAttribute('onload', "this.rel='stylesheet'");
+        noscriptFallback = true;
+      } else {
+        const bodyLink = document.createElement('link');
+        bodyLink.setAttribute('rel', 'stylesheet');
+        if (media) bodyLink.setAttribute('media', media);
+        bodyLink.setAttribute('href', href);
+        document.body.appendChild(bodyLink);
+        style.$$links.push(bodyLink);
+      }
+    }
+
+    if (this.options.noscriptFallback !== false && noscriptFallback) {
+      const noscript = document.createElement('noscript');
+      const noscriptLink = document.createElement('link');
+      noscriptLink.setAttribute('rel', 'stylesheet');
+      noscriptLink.setAttribute('href', href);
+      if (media) noscriptLink.setAttribute('media', media);
+      noscript.appendChild(noscriptLink);
+      link.parentNode.insertBefore(noscript, link.nextSibling);
+      style.$$links.push(noscript);
+    }
+  }
+
+  /**
+   * Prune the source CSS files
+   */
+  pruneSource(style, before, sheetInverse) {
+    // if external stylesheet would be below minimum size, just inline everything
+    const minSize = this.options.minimumExternalSize;
+    const name = style.$$name;
+    if (minSize && sheetInverse.length < minSize) {
+      this.logger.info(
+        `\u001b[32mInlined all of ${name} (non-critical external stylesheet would have been ${sheetInverse.length}b, which was below the threshold of ${minSize})\u001b[39m`
+      );
+      // setNodeText(style, before);
+      style.textContent = before;
+      // remove any associated external resources/loaders:
+      if (style.$$links) {
+        for (const link of style.$$links) {
+          const parent = link.parentNode;
+          if (parent) parent.removeChild(link);
+        }
+      }
+
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Parse the stylesheet within a <style> element, then reduce it to contain only rules used by the document.
+   */
+  async processStyle(style, document) {
+    if (style.$$reduce === false) return;
+
+    const name = style.$$name ? style.$$name.replace(/^\//, '') : 'inline CSS';
+    const options = this.options;
+    // const document = style.ownerDocument;
+    const head = document.querySelector('head');
+    let keyframesMode = options.keyframes || 'critical';
+    // we also accept a boolean value for options.keyframes
+    if (keyframesMode === true) keyframesMode = 'all';
+    if (keyframesMode === false) keyframesMode = 'none';
+
+    let sheet = style.textContent;
+
+    // store a reference to the previous serialized stylesheet for reporting stats
+    const before = sheet;
+
+    // Skip empty stylesheets
+    if (!sheet) return;
+
+    const ast = parseStylesheet(sheet);
+    const astInverse = options.pruneSource ? parseStylesheet(sheet) : null;
+
+    // a string to search for font names (very loose)
+    let criticalFonts = '';
+
+    const failedSelectors = [];
+
+    const criticalKeyframeNames = [];
+
+    // Walk all CSS rules, marking unused rules with `.$$remove=true` for removal in the second pass.
+    // This first pass is also used to collect font and keyframe usage used in the second pass.
+    walkStyleRules(
+      ast,
+      markOnly((rule) => {
+        if (rule.type === 'rule') {
+          // Filter the selector list down to only those match
+          rule.filterSelectors((sel) => {
+            // Strip pseudo-elements and pseudo-classes, since we only care that their associated elements exist.
+            // This means any selector for a pseudo-element or having a pseudo-class will be inlined if the rest of the selector matches.
+            if (sel !== ':root') {
+              sel = sel.replace(/(?:>\s*)?::?[a-z-]+\s*(\{|$)/gi, '$1').trim();
+            }
+            if (!sel) return false;
+
+            try {
+              return document.querySelector(sel) != null;
+            } catch (e) {
+              failedSelectors.push(sel + ' -> ' + e.message);
+              return false;
+            }
+          });
+          // If there are no matched selectors, remove the rule:
+          if (rule.selectors.length === 0) {
+            return false;
+          }
+
+          if (rule.declarations) {
+            for (let i = 0; i < rule.declarations.length; i++) {
+              const decl = rule.declarations[i];
+
+              // detect used fonts
+              if (decl.property && decl.property.match(/\bfont(-family)?\b/i)) {
+                criticalFonts += ' ' + decl.value;
+              }
+
+              // detect used keyframes
+              if (
+                decl.property === 'animation' ||
+                decl.property === 'animation-name'
+              ) {
+                // @todo: parse animation declarations and extract only the name. for now we'll do a lazy match.
+                const names = decl.value.split(/\s+/);
+                for (let j = 0; j < names.length; j++) {
+                  const name = names[j].trim();
+                  if (name) criticalKeyframeNames.push(name);
+                }
+              }
+            }
+          }
+        }
+
+        // keep font rules, they're handled in the second pass:
+        if (rule.type === 'font-face') return;
+
+        // If there are no remaining rules, remove the whole rule:
+        const rules = rule.rules && rule.rules.filter((rule) => !rule.$$remove);
+        return !rules || rules.length !== 0;
+      })
+    );
+
+    if (failedSelectors.length !== 0) {
+      this.logger.warn(
+        `${
+          failedSelectors.length
+        } rules skipped due to selector errors:\n  ${failedSelectors.join(
+          '\n  '
+        )}`
+      );
+    }
+
+    const shouldPreloadFonts =
+      options.fonts === true || options.preloadFonts === true;
+    const shouldInlineFonts =
+      options.fonts !== false && options.inlineFonts === true;
+
+    const preloadedFonts = [];
+    // Second pass, using data picked up from the first
+    walkStyleRulesWithReverseMirror(ast, astInverse, (rule) => {
+      // remove any rules marked in the first pass
+      if (rule.$$remove === true) return false;
+
+      applyMarkedSelectors(rule);
+
+      // prune @keyframes rules
+      if (rule.type === 'keyframes') {
+        if (keyframesMode === 'none') return false;
+        if (keyframesMode === 'all') return true;
+        return criticalKeyframeNames.indexOf(rule.name) !== -1;
+      }
+
+      // prune @font-face rules
+      if (rule.type === 'font-face') {
+        let family, src;
+        for (let i = 0; i < rule.declarations.length; i++) {
+          const decl = rule.declarations[i];
+          if (decl.property === 'src') {
+            // @todo parse this properly and generate multiple preloads with type="font/woff2" etc
+            src = (decl.value.match(/url\s*\(\s*(['"]?)(.+?)\1\s*\)/) || [])[2];
+          } else if (decl.property === 'font-family') {
+            family = decl.value;
+          }
+        }
+
+        if (src && shouldPreloadFonts && preloadedFonts.indexOf(src) === -1) {
+          preloadedFonts.push(src);
+          const preload = document.createElement('link');
+          preload.setAttribute('rel', 'preload');
+          preload.setAttribute('as', 'font');
+          preload.setAttribute('crossorigin', 'anonymous');
+          preload.setAttribute('href', src.trim());
+          head.appendChild(preload);
+        }
+
+        // if we're missing info, if the font is unused, or if critical font inlining is disabled, remove the rule:
+        if (
+          !family ||
+          !src ||
+          criticalFonts.indexOf(family) === -1 ||
+          !shouldInlineFonts
+        ) {
+          return false;
+        }
+      }
+    });
+
+    sheet = serializeStylesheet(ast, {
+      compress: this.options.compress !== false,
+    }).trim();
+
+    // If all rules were removed, get rid of the style element entirely
+    if (sheet.trim().length === 0) {
+      if (style.parentNode) {
+        style.remove();
+      }
+      return;
+    }
+
+    let afterText = '';
+    let styleInlinedCompletely = false;
+    if (options.pruneSource) {
+      const sheetInverse = serializeStylesheet(astInverse, {
+        compress: this.options.compress !== false,
+      });
+
+      styleInlinedCompletely = this.pruneSource(style, before, sheetInverse);
+
+      if (styleInlinedCompletely) {
+        const percent = (sheetInverse.length / before.length) * 100;
+        afterText = `, reducing non-inlined size ${
+          percent | 0
+        }% to ${prettyBytes(sheetInverse.length)}`;
+      }
+    }
+
+    // replace the inline stylesheet with its critical'd counterpart
+    if (!styleInlinedCompletely) {
+      style.textContent = sheet;
+    }
+
+    // output stats
+    const percent = ((sheet.length / before.length) * 100) | 0;
+    this.logger.info(
+      '\u001b[32mInlined ' +
+        prettyBytes(sheet.length) +
+        ' (' +
+        percent +
+        '% of original ' +
+        prettyBytes(before.length) +
+        ') of ' +
+        name +
+        afterText +
+        '.\u001b[39m'
+    );
+  }
+}
