@angular-devkit/build-angular
Version:
Angular Webpack Build Facade
179 lines • 24.8 kB
JavaScript
;
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.InlineCriticalCssProcessor = void 0;
const fs = __importStar(require("fs"));
const Critters = require('critters');
/**
* Pattern used to extract the media query set by Critters in an `onload` handler.
*/
const MEDIA_SET_HANDLER_PATTERN = /^this\.media=["'](.*)["'];?$/;
/**
* Name of the attribute used to save the Critters media query so it can be re-assigned on load.
*/
const CSP_MEDIA_ATTR = 'ngCspMedia';
/**
* Script text used to change the media value of the link tags.
*/
const LINK_LOAD_SCRIPT_CONTENT = [
`(() => {`,
// Save the `children` in a variable since they're a live DOM node collection.
// We iterate over the direct descendants, instead of going through a `querySelectorAll`,
// because we know that the tags will be directly inside the `head`.
` const children = document.head.children;`,
// Declare `onLoad` outside the loop to avoid leaking memory.
// Can't be an arrow function, because we need `this` to refer to the DOM node.
` function onLoad() {this.media = this.getAttribute('${CSP_MEDIA_ATTR}');}`,
// Has to use a plain for loop, because some browsers don't support
// `forEach` on `children` which is a `HTMLCollection`.
` for (let i = 0; i < children.length; i++) {`,
` const child = children[i];`,
` child.hasAttribute('${CSP_MEDIA_ATTR}') && child.addEventListener('load', onLoad);`,
` }`,
`})();`,
].join('\n');
class CrittersExtended extends Critters {
constructor(optionsExtended) {
super({
logger: {
warn: (s) => this.warnings.push(s),
error: (s) => this.errors.push(s),
info: () => { },
},
logLevel: 'warn',
path: optionsExtended.outputPath,
publicPath: optionsExtended.deployUrl,
compress: !!optionsExtended.minify,
pruneSource: false,
reduceInlineStyles: false,
mergeStylesheets: false,
// Note: if `preload` changes to anything other than `media`, the logic in
// `embedLinkedStylesheetOverride` will have to be updated.
preload: 'media',
noscriptFallback: true,
inlineFonts: true,
});
this.optionsExtended = optionsExtended;
this.warnings = [];
this.errors = [];
this.addedCspScriptsDocuments = new WeakSet();
this.documentNonces = new WeakMap();
/**
* Override of the Critters `embedLinkedStylesheet` method
* that makes it work with Angular's CSP APIs.
*/
this.embedLinkedStylesheetOverride = async (link, document) => {
const returnValue = await this.initialEmbedLinkedStylesheet(link, document);
const cspNonce = this.findCspNonce(document);
if (cspNonce) {
const crittersMedia = link.getAttribute('onload')?.match(MEDIA_SET_HANDLER_PATTERN);
if (crittersMedia) {
// If there's a Critters-generated `onload` handler and the file has an Angular CSP nonce,
// we have to remove the handler, because it's incompatible with CSP. We save the value
// in a different attribute and we generate a script tag with the nonce that uses
// `addEventListener` to apply the media query instead.
link.removeAttribute('onload');
link.setAttribute(CSP_MEDIA_ATTR, crittersMedia[1]);
this.conditionallyInsertCspLoadingScript(document, cspNonce);
}
// Ideally we would hook in at the time Critters inserts the `style` tags, but there isn't
// a way of doing that at the moment so we fall back to doing it any time a `link` tag is
// inserted. We mitigate it by only iterating the direct children of the `<head>` which
// should be pretty shallow.
document.head.children.forEach((child) => {
if (child.tagName === 'style' && !child.hasAttribute('nonce')) {
child.setAttribute('nonce', cspNonce);
}
});
}
return returnValue;
};
// We can't use inheritance to override `embedLinkedStylesheet`, because it's not declared in
// the `Critters` .d.ts which means that we can't call the `super` implementation. TS doesn't
// allow for `super` to be cast to a different type.
this.initialEmbedLinkedStylesheet = this.embedLinkedStylesheet;
this.embedLinkedStylesheet = this.embedLinkedStylesheetOverride;
}
readFile(path) {
const readAsset = this.optionsExtended.readAsset;
return readAsset ? readAsset(path) : fs.promises.readFile(path, 'utf-8');
}
/**
* Finds the CSP nonce for a specific document.
*/
findCspNonce(document) {
if (this.documentNonces.has(document)) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
return this.documentNonces.get(document);
}
// HTML attribute are case-insensitive, but the parser used by Critters is case-sensitive.
const nonceElement = document.querySelector('[ngCspNonce], [ngcspnonce]');
const cspNonce = nonceElement?.getAttribute('ngCspNonce') || nonceElement?.getAttribute('ngcspnonce') || null;
this.documentNonces.set(document, cspNonce);
return cspNonce;
}
/**
* Inserts the `script` tag that swaps the critical CSS at runtime,
* if one hasn't been inserted into the document already.
*/
conditionallyInsertCspLoadingScript(document, nonce) {
if (this.addedCspScriptsDocuments.has(document)) {
return;
}
const script = document.createElement('script');
script.setAttribute('nonce', nonce);
script.textContent = LINK_LOAD_SCRIPT_CONTENT;
// Append the script to the head since it needs to
// run as early as possible, after the `link` tags.
document.head.appendChild(script);
this.addedCspScriptsDocuments.add(document);
}
}
class InlineCriticalCssProcessor {
constructor(options) {
this.options = options;
}
async process(html, options) {
const critters = new CrittersExtended({ ...this.options, ...options });
const content = await critters.process(html);
return {
// Clean up value from value less attributes.
// This is caused because parse5 always requires attributes to have a string value.
// nomodule="" defer="" -> nomodule defer.
content: content.replace(/(\s(?:defer|nomodule))=""/g, '$1'),
errors: critters.errors,
warnings: critters.warnings,
};
}
}
exports.InlineCriticalCssProcessor = InlineCriticalCssProcessor;
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as fs from 'fs';\n\nconst Critters: typeof import('critters').default = require('critters');\n\n/**\n * Pattern used to extract the media query set by Critters in an `onload` handler.\n */\nconst MEDIA_SET_HANDLER_PATTERN = /^this\\.media=[\"'](.*)[\"'];?$/;\n\n/**\n * Name of the attribute used to save the Critters media query so it can be re-assigned on load.\n */\nconst CSP_MEDIA_ATTR = 'ngCspMedia';\n\n/**\n * Script text used to change the media value of the link tags.\n */\nconst LINK_LOAD_SCRIPT_CONTENT = [\n  `(() => {`,\n  // Save the `children` in a variable since they're a live DOM node collection.\n  // We iterate over the direct descendants, instead of going through a `querySelectorAll`,\n  // because we know that the tags will be directly inside the `head`.\n  `  const children = document.head.children;`,\n  // Declare `onLoad` outside the loop to avoid leaking memory.\n  // Can't be an arrow function, because we need `this` to refer to the DOM node.\n  `  function onLoad() {this.media = this.getAttribute('${CSP_MEDIA_ATTR}');}`,\n  // Has to use a plain for loop, because some browsers don't support\n  // `forEach` on `children` which is a `HTMLCollection`.\n  `  for (let i = 0; i < children.length; i++) {`,\n  `    const child = children[i];`,\n  `    child.hasAttribute('${CSP_MEDIA_ATTR}') && child.addEventListener('load', onLoad);`,\n  `  }`,\n  `})();`,\n].join('\\n');\n\nexport interface InlineCriticalCssProcessOptions {\n  outputPath: string;\n}\n\nexport interface InlineCriticalCssProcessorOptions {\n  minify?: boolean;\n  deployUrl?: string;\n  readAsset?: (path: string) => Promise<string>;\n}\n\n/** Partial representation of an `HTMLElement`. */\ninterface PartialHTMLElement {\n  getAttribute(name: string): string | null;\n  setAttribute(name: string, value: string): void;\n  hasAttribute(name: string): boolean;\n  removeAttribute(name: string): void;\n  appendChild(child: PartialHTMLElement): void;\n  textContent: string;\n  tagName: string | null;\n  children: PartialHTMLElement[];\n  next: PartialHTMLElement | null;\n  prev: PartialHTMLElement | null;\n}\n\n/** Partial representation of an HTML `Document`. */\ninterface PartialDocument {\n  head: PartialHTMLElement;\n  createElement(tagName: string): PartialHTMLElement;\n  querySelector(selector: string): PartialHTMLElement | null;\n}\n\n/** Signature of the `Critters.embedLinkedStylesheet` method. */\ntype EmbedLinkedStylesheetFn = (\n  link: PartialHTMLElement,\n  document: PartialDocument,\n) => Promise<unknown>;\n\nclass CrittersExtended extends Critters {\n  readonly warnings: string[] = [];\n  readonly errors: string[] = [];\n  private initialEmbedLinkedStylesheet: EmbedLinkedStylesheetFn;\n  private addedCspScriptsDocuments = new WeakSet<PartialDocument>();\n  private documentNonces = new WeakMap<PartialDocument, string | null>();\n\n  // Inherited from `Critters`, but not exposed in the typings.\n  protected embedLinkedStylesheet!: EmbedLinkedStylesheetFn;\n\n  constructor(\n    private readonly optionsExtended: InlineCriticalCssProcessorOptions &\n      InlineCriticalCssProcessOptions,\n  ) {\n    super({\n      logger: {\n        warn: (s: string) => this.warnings.push(s),\n        error: (s: string) => this.errors.push(s),\n        info: () => {},\n      },\n      logLevel: 'warn',\n      path: optionsExtended.outputPath,\n      publicPath: optionsExtended.deployUrl,\n      compress: !!optionsExtended.minify,\n      pruneSource: false,\n      reduceInlineStyles: false,\n      mergeStylesheets: false,\n      // Note: if `preload` changes to anything other than `media`, the logic in\n      // `embedLinkedStylesheetOverride` will have to be updated.\n      preload: 'media',\n      noscriptFallback: true,\n      inlineFonts: true,\n    });\n\n    // We can't use inheritance to override `embedLinkedStylesheet`, because it's not declared in\n    // the `Critters` .d.ts which means that we can't call the `super` implementation. TS doesn't\n    // allow for `super` to be cast to a different type.\n    this.initialEmbedLinkedStylesheet = this.embedLinkedStylesheet;\n    this.embedLinkedStylesheet = this.embedLinkedStylesheetOverride;\n  }\n\n  public override readFile(path: string): Promise<string> {\n    const readAsset = this.optionsExtended.readAsset;\n\n    return readAsset ? readAsset(path) : fs.promises.readFile(path, 'utf-8');\n  }\n\n  /**\n   * Override of the Critters `embedLinkedStylesheet` method\n   * that makes it work with Angular's CSP APIs.\n   */\n  private embedLinkedStylesheetOverride: EmbedLinkedStylesheetFn = async (link, document) => {\n    const returnValue = await this.initialEmbedLinkedStylesheet(link, document);\n    const cspNonce = this.findCspNonce(document);\n\n    if (cspNonce) {\n      const crittersMedia = link.getAttribute('onload')?.match(MEDIA_SET_HANDLER_PATTERN);\n\n      if (crittersMedia) {\n        // If there's a Critters-generated `onload` handler and the file has an Angular CSP nonce,\n        // we have to remove the handler, because it's incompatible with CSP. We save the value\n        // in a different attribute and we generate a script tag with the nonce that uses\n        // `addEventListener` to apply the media query instead.\n        link.removeAttribute('onload');\n        link.setAttribute(CSP_MEDIA_ATTR, crittersMedia[1]);\n        this.conditionallyInsertCspLoadingScript(document, cspNonce);\n      }\n\n      // Ideally we would hook in at the time Critters inserts the `style` tags, but there isn't\n      // a way of doing that at the moment so we fall back to doing it any time a `link` tag is\n      // inserted. We mitigate it by only iterating the direct children of the `<head>` which\n      // should be pretty shallow.\n      document.head.children.forEach((child) => {\n        if (child.tagName === 'style' && !child.hasAttribute('nonce')) {\n          child.setAttribute('nonce', cspNonce);\n        }\n      });\n    }\n\n    return returnValue;\n  };\n\n  /**\n   * Finds the CSP nonce for a specific document.\n   */\n  private findCspNonce(document: PartialDocument): string | null {\n    if (this.documentNonces.has(document)) {\n      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion\n      return this.documentNonces.get(document)!;\n    }\n\n    // HTML attribute are case-insensitive, but the parser used by Critters is case-sensitive.\n    const nonceElement = document.querySelector('[ngCspNonce], [ngcspnonce]');\n    const cspNonce =\n      nonceElement?.getAttribute('ngCspNonce') || nonceElement?.getAttribute('ngcspnonce') || null;\n\n    this.documentNonces.set(document, cspNonce);\n\n    return cspNonce;\n  }\n\n  /**\n   * Inserts the `script` tag that swaps the critical CSS at runtime,\n   * if one hasn't been inserted into the document already.\n   */\n  private conditionallyInsertCspLoadingScript(document: PartialDocument, nonce: string): void {\n    if (this.addedCspScriptsDocuments.has(document)) {\n      return;\n    }\n\n    const script = document.createElement('script');\n    script.setAttribute('nonce', nonce);\n    script.textContent = LINK_LOAD_SCRIPT_CONTENT;\n    // Append the script to the head since it needs to\n    // run as early as possible, after the `link` tags.\n    document.head.appendChild(script);\n    this.addedCspScriptsDocuments.add(document);\n  }\n}\n\nexport class InlineCriticalCssProcessor {\n  constructor(protected readonly options: InlineCriticalCssProcessorOptions) {}\n\n  async process(\n    html: string,\n    options: InlineCriticalCssProcessOptions,\n  ): Promise<{ content: string; warnings: string[]; errors: string[] }> {\n    const critters = new CrittersExtended({ ...this.options, ...options });\n    const content = await critters.process(html);\n\n    return {\n      // Clean up value from value less attributes.\n      // This is caused because parse5 always requires attributes to have a string value.\n      // nomodule=\"\" defer=\"\" -> nomodule defer.\n      content: content.replace(/(\\s(?:defer|nomodule))=\"\"/g, '$1'),\n      errors: critters.errors,\n      warnings: critters.warnings,\n    };\n  }\n}\n"]}