@angular-devkit/build-angular
Version:
Angular Webpack Build Facade
135 lines • 19.4 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 __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const remapping_1 = __importDefault(require("@ampproject/remapping"));
const terser_1 = require("terser");
const esbuild_executor_1 = require("./esbuild-executor");
/**
* The cached esbuild executor.
* This will automatically use the native or WASM version based on platform and availability
* with the native version given priority due to its superior performance.
*/
let esbuild;
/**
* Handles optimization requests sent from the main thread via the `JavaScriptOptimizerPlugin`.
*/
async function default_1({ asset, options }) {
// esbuild is used as a first pass
const esbuildResult = await optimizeWithEsbuild(asset.code, asset.name, options);
if (isEsBuildFailure(esbuildResult)) {
return {
name: asset.name,
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
errors: await esbuild.formatMessages(esbuildResult.errors, { kind: 'error' }),
};
}
// terser is used as a second pass
const terserResult = await optimizeWithTerser(asset.name, esbuildResult.code, options.sourcemap, options.advanced);
// Merge intermediate sourcemaps with input sourcemap if enabled
let fullSourcemap;
if (options.sourcemap) {
const partialSourcemaps = [];
if (esbuildResult.map) {
partialSourcemaps.unshift(JSON.parse(esbuildResult.map));
}
if (terserResult.map) {
partialSourcemaps.unshift(terserResult.map);
}
if (asset.map) {
partialSourcemaps.push(asset.map);
}
fullSourcemap = (0, remapping_1.default)(partialSourcemaps, () => null);
}
return { name: asset.name, code: terserResult.code, map: fullSourcemap };
}
exports.default = default_1;
/**
* Optimizes a JavaScript asset using esbuild.
*
* @param content The JavaScript asset source content to optimize.
* @param name The name of the JavaScript asset. Used to generate source maps.
* @param options The optimization request options to apply to the content.
* @returns A promise that resolves with the optimized code, source map, and any warnings.
*/
async function optimizeWithEsbuild(content, name, options) {
if (!esbuild) {
esbuild = new esbuild_executor_1.EsbuildExecutor(options.alwaysUseWasm);
}
try {
return await esbuild.transform(content, {
minifyIdentifiers: !options.keepIdentifierNames,
minifySyntax: true,
// NOTE: Disabling whitespace ensures unused pure annotations are kept
minifyWhitespace: false,
pure: ['forwardRef'],
legalComments: options.removeLicenses ? 'none' : 'inline',
sourcefile: name,
sourcemap: options.sourcemap && 'external',
define: options.define,
target: options.target,
});
}
catch (error) {
if (isEsBuildFailure(error)) {
return error;
}
throw error;
}
}
/**
* Optimizes a JavaScript asset using terser.
*
* @param name The name of the JavaScript asset. Used to generate source maps.
* @param code The JavaScript asset source content to optimize.
* @param sourcemaps If true, generate an output source map for the optimized code.
* @param advanced Controls advanced optimizations.
* @returns A promise that resolves with the optimized code and source map.
*/
async function optimizeWithTerser(name, code, sourcemaps, advanced) {
const result = await (0, terser_1.minify)({ [name]: code }, {
compress: {
passes: advanced ? 2 : 1,
pure_getters: advanced,
},
// Set to ES2015 to prevent higher level features from being introduced when browserslist
// contains older browsers. The build system requires browsers to support ES2015 at a minimum.
ecma: 2015,
// esbuild in the first pass is used to minify identifiers instead of mangle here
mangle: false,
// esbuild in the first pass is used to minify function names
keep_fnames: true,
format: {
// ASCII output is enabled here as well to prevent terser from converting back to UTF-8
ascii_only: true,
wrap_func_args: false,
},
sourceMap: sourcemaps &&
{
asObject: true,
// typings don't include asObject option
// eslint-disable-next-line @typescript-eslint/no-explicit-any
},
});
if (typeof result.code !== 'string') {
throw new Error('Terser failed for unknown reason.');
}
return { code: result.code, map: result.map };
}
/**
* Determines if an unknown value is an esbuild BuildFailure error object thrown by esbuild.
* @param value A potential esbuild BuildFailure error object.
* @returns `true` if the object is determined to be a BuildFailure object; otherwise, `false`.
*/
function isEsBuildFailure(value) {
return !!value && typeof value === 'object' && 'errors' in value && 'warnings' in value;
}
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Some platforms may not support the native-variant and\n   * this option allows one support test to be conducted prior to all the workers starting.\n   */\n  alwaysUseWasm: boolean;\n}\n\n/**\n * A request to optimize JavaScript using the supplied options.\n */\ninterface OptimizeRequest {\n  /**\n   * The options to use when optimizing.\n   */\n  options: OptimizeRequestOptions;\n\n  /**\n   * The JavaScript asset to optimize.\n   */\n  asset: {\n    /**\n     * The name of the JavaScript asset (typically the filename).\n     */\n    name: string;\n    /**\n     * The source content of the JavaScript asset.\n     */\n    code: string;\n    /**\n     * The source map of the JavaScript asset, if available.\n     * This map is merged with all intermediate source maps during optimization.\n     */\n    map: object;\n  };\n}\n\n/**\n * The cached esbuild executor.\n * This will automatically use the native or WASM version based on platform and availability\n * with the native version given priority due to its superior performance.\n */\nlet esbuild: EsbuildExecutor | undefined;\n\n/**\n * Handles optimization requests sent from the main thread via the `JavaScriptOptimizerPlugin`.\n */\nexport default async function ({ asset, options }: OptimizeRequest) {\n  // esbuild is used as a first pass\n  const esbuildResult = await optimizeWithEsbuild(asset.code, asset.name, options);\n  if (isEsBuildFailure(esbuildResult)) {\n    return {\n      name: asset.name,\n      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion\n      errors: await esbuild!.formatMessages(esbuildResult.errors, { kind: 'error' }),\n    };\n  }\n\n  // terser is used as a second pass\n  const terserResult = await optimizeWithTerser(\n    asset.name,\n    esbuildResult.code,\n    options.sourcemap,\n    options.advanced,\n  );\n\n  // Merge intermediate sourcemaps with input sourcemap if enabled\n  let fullSourcemap;\n  if (options.sourcemap) {\n    const partialSourcemaps = [];\n\n    if (esbuildResult.map) {\n      partialSourcemaps.unshift(JSON.parse(esbuildResult.map));\n    }\n\n    if (terserResult.map) {\n      partialSourcemaps.unshift(terserResult.map);\n    }\n\n    if (asset.map) {\n      partialSourcemaps.push(asset.map);\n    }\n\n    fullSourcemap = remapping(partialSourcemaps, () => null);\n  }\n\n  return { name: asset.name, code: terserResult.code, map: fullSourcemap };\n}\n\n/**\n * Optimizes a JavaScript asset using esbuild.\n *\n * @param content The JavaScript asset source content to optimize.\n * @param name The name of the JavaScript asset. Used to generate source maps.\n * @param options The optimization request options to apply to the content.\n * @returns A promise that resolves with the optimized code, source map, and any warnings.\n */\nasync function optimizeWithEsbuild(\n  content: string,\n  name: string,\n  options: OptimizeRequest['options'],\n): Promise<TransformResult | BuildFailure> {\n  if (!esbuild) {\n    esbuild = new EsbuildExecutor(options.alwaysUseWasm);\n  }\n\n  try {\n    return await esbuild.transform(content, {\n      minifyIdentifiers: !options.keepIdentifierNames,\n      minifySyntax: true,\n      // NOTE: Disabling whitespace ensures unused pure annotations are kept\n      minifyWhitespace: false,\n      pure: ['forwardRef'],\n      legalComments: options.removeLicenses ? 'none' : 'inline',\n      sourcefile: name,\n      sourcemap: options.sourcemap && 'external',\n      define: options.define,\n      target: options.target,\n    });\n  } catch (error) {\n    if (isEsBuildFailure(error)) {\n      return error;\n    }\n\n    throw error;\n  }\n}\n\n/**\n * Optimizes a JavaScript asset using terser.\n *\n * @param name The name of the JavaScript asset. Used to generate source maps.\n * @param code The JavaScript asset source content to optimize.\n * @param sourcemaps If true, generate an output source map for the optimized code.\n * @param advanced Controls advanced optimizations.\n * @returns A promise that resolves with the optimized code and source map.\n */\nasync function optimizeWithTerser(\n  name: string,\n  code: string,\n  sourcemaps: boolean | undefined,\n  advanced: boolean | undefined,\n): Promise<{ code: string; map?: object }> {\n  const result = await minify(\n    { [name]: code },\n    {\n      compress: {\n        passes: advanced ? 2 : 1,\n        pure_getters: advanced,\n      },\n      // Set to ES2015 to prevent higher level features from being introduced when browserslist\n      // contains older browsers. The build system requires browsers to support ES2015 at a minimum.\n      ecma: 2015,\n      // esbuild in the first pass is used to minify identifiers instead of mangle here\n      mangle: false,\n      // esbuild in the first pass is used to minify function names\n      keep_fnames: true,\n      format: {\n        // ASCII output is enabled here as well to prevent terser from converting back to UTF-8\n        ascii_only: true,\n        wrap_func_args: false,\n      },\n      sourceMap:\n        sourcemaps &&\n        ({\n          asObject: true,\n          // typings don't include asObject option\n          // eslint-disable-next-line @typescript-eslint/no-explicit-any\n        } as any),\n    },\n  );\n\n  if (typeof result.code !== 'string') {\n    throw new Error('Terser failed for unknown reason.');\n  }\n\n  return { code: result.code, map: result.map as object };\n}\n\n/**\n * Determines if an unknown value is an esbuild BuildFailure error object thrown by esbuild.\n * @param value A potential esbuild BuildFailure error object.\n * @returns `true` if the object is determined to be a BuildFailure object; otherwise, `false`.\n */\nfunction isEsBuildFailure(value: unknown): value is BuildFailure {\n  return !!value && typeof value === 'object' && 'errors' in value && 'warnings' in value;\n}\n"]}