@angular-devkit/build-angular
Version:
Angular Webpack Build Facade
165 lines • 26.3 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 });
exports.JavaScriptOptimizerPlugin = void 0;
const piscina_1 = __importDefault(require("piscina"));
const environment_options_1 = require("../../../utils/environment-options");
const webpack_diagnostics_1 = require("../../../utils/webpack-diagnostics");
const utils_1 = require("../../esbuild/utils");
const esbuild_executor_1 = require("./esbuild-executor");
/**
* The maximum number of Workers that will be created to execute optimize tasks.
*/
const MAX_OPTIMIZE_WORKERS = environment_options_1.maxWorkers;
/**
* The name of the plugin provided to Webpack when tapping Webpack compiler hooks.
*/
const PLUGIN_NAME = 'angular-javascript-optimizer';
/**
* A Webpack plugin that provides JavaScript optimization capabilities.
*
* The plugin uses both `esbuild` and `terser` to provide both fast and highly-optimized
* code output. `esbuild` is used as an initial pass to remove the majority of unused code
* as well as shorten identifiers. `terser` is then used as a secondary pass to apply
* optimizations not yet implemented by `esbuild`.
*/
class JavaScriptOptimizerPlugin {
constructor(options) {
this.options = options;
if (options.supportedBrowsers) {
this.targets = (0, utils_1.transformSupportedBrowsersToTargets)(options.supportedBrowsers);
}
}
apply(compiler) {
const { OriginalSource, SourceMapSource } = compiler.webpack.sources;
compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
const logger = compilation.getLogger('build-angular.JavaScriptOptimizerPlugin');
compilation.hooks.processAssets.tapPromise({
name: PLUGIN_NAME,
stage: compiler.webpack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_SIZE,
}, async (compilationAssets) => {
logger.time('optimize js assets');
const scriptsToOptimize = [];
const cache = compilation.options.cache && compilation.getCache('JavaScriptOptimizerPlugin');
// Analyze the compilation assets for scripts that require optimization
for (const assetName of Object.keys(compilationAssets)) {
if (!assetName.endsWith('.js')) {
continue;
}
const scriptAsset = compilation.getAsset(assetName);
// Skip assets that have already been optimized or are verbatim copies (project assets)
if (!scriptAsset || scriptAsset.info.minimized || scriptAsset.info.copied) {
continue;
}
const { source: scriptAssetSource, name } = scriptAsset;
let cacheItem;
if (cache) {
const eTag = cache.getLazyHashedEtag(scriptAssetSource);
cacheItem = cache.getItemCache(name, eTag);
const cachedOutput = await cacheItem.getPromise();
if (cachedOutput) {
logger.debug(`${name} restored from cache`);
compilation.updateAsset(name, cachedOutput.source, (assetInfo) => ({
...assetInfo,
minimized: true,
}));
continue;
}
}
const { source, map } = scriptAssetSource.sourceAndMap();
scriptsToOptimize.push({
name: scriptAsset.name,
code: typeof source === 'string' ? source : source.toString(),
map,
cacheItem,
});
}
if (scriptsToOptimize.length === 0) {
return;
}
// Ensure all replacement values are strings which is the expected type for esbuild
let define;
if (this.options.define) {
define = {};
for (const [key, value] of Object.entries(this.options.define)) {
define[key] = String(value);
}
}
// Setup the options used by all worker tasks
const optimizeOptions = {
sourcemap: this.options.sourcemap,
define,
keepIdentifierNames: this.options.keepIdentifierNames,
target: this.targets,
removeLicenses: this.options.removeLicenses,
advanced: this.options.advanced,
// Perform a single native esbuild support check.
// This removes the need for each worker to perform the check which would
// otherwise require spawning a separate process per worker.
alwaysUseWasm: !(await esbuild_executor_1.EsbuildExecutor.hasNativeSupport()),
};
// Sort scripts so larger scripts start first - worker pool uses a FIFO queue
scriptsToOptimize.sort((a, b) => a.code.length - b.code.length);
// Initialize the task worker pool
const workerPath = require.resolve('./javascript-optimizer-worker');
const workerPool = new piscina_1.default({
filename: workerPath,
maxThreads: MAX_OPTIMIZE_WORKERS,
});
// Enqueue script optimization tasks and update compilation assets as the tasks complete
try {
const tasks = [];
for (const { name, code, map, cacheItem } of scriptsToOptimize) {
logger.time(`optimize asset: ${name}`);
tasks.push(workerPool
.run({
asset: {
name,
code,
map,
},
options: optimizeOptions,
})
.then(async ({ code, name, map, errors }) => {
if (errors?.length) {
for (const error of errors) {
(0, webpack_diagnostics_1.addError)(compilation, `Optimization error [${name}]: ${error}`);
}
return;
}
const optimizedAsset = map
? new SourceMapSource(code, name, map)
: new OriginalSource(code, name);
compilation.updateAsset(name, optimizedAsset, (assetInfo) => ({
...assetInfo,
minimized: true,
}));
logger.timeEnd(`optimize asset: ${name}`);
return cacheItem?.storePromise({
source: optimizedAsset,
});
}, (error) => {
(0, webpack_diagnostics_1.addError)(compilation, `Optimization error [${name}]: ${error.stack || error.message}`);
}));
}
await Promise.all(tasks);
}
finally {
void workerPool.destroy();
}
logger.timeEnd('optimize js assets');
});
});
}
}
exports.JavaScriptOptimizerPlugin = JavaScriptOptimizerPlugin;
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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 Piscina from 'piscina';\nimport type { Compiler, sources } from 'webpack';\nimport { maxWorkers } from '../../../utils/environment-options';\nimport { addError } from '../../../utils/webpack-diagnostics';\nimport { transformSupportedBrowsersToTargets } from '../../esbuild/utils';\nimport { EsbuildExecutor } from './esbuild-executor';\nimport type { OptimizeRequestOptions } from './javascript-optimizer-worker';\n\n/**\n * The maximum number of Workers that will be created to execute optimize tasks.\n */\nconst MAX_OPTIMIZE_WORKERS = maxWorkers;\n\n/**\n * The name of the plugin provided to Webpack when tapping Webpack compiler hooks.\n */\nconst PLUGIN_NAME = 'angular-javascript-optimizer';\n\n/**\n * The options used to configure the {@link JavaScriptOptimizerPlugin}.\n */\nexport interface JavaScriptOptimizerOptions {\n  /**\n   * Enables advanced optimizations in the underlying JavaScript optimizers.\n   * This currently increases the `terser` passes to 2 and enables the `pure_getters`\n   * option for `terser`.\n   */\n  advanced?: boolean;\n\n  /**\n   * An object record of string keys that will be replaced with their respective values when found\n   * within the code during optimization.\n   */\n  define: Record<string, string | number | boolean>;\n\n  /**\n   * Enables the generation of a sourcemap during optimization.\n   * The output sourcemap will be a full sourcemap containing the merge of the input sourcemap and\n   * all intermediate sourcemaps.\n   */\n  sourcemap?: boolean;\n\n  /**\n   * A list of supported browsers that is used for output code.\n   */\n  supportedBrowsers?: string[];\n\n  /**\n   * Enables the retention of identifier names and ensures that function and class names are\n   * present in the output code.\n   *\n   * **Note**: in some cases symbols are still renamed to avoid collisions.\n   */\n  keepIdentifierNames: boolean;\n\n  /**\n   * Enables the removal of all license comments from the output code.\n   */\n  removeLicenses?: boolean;\n}\n\n/**\n * A Webpack plugin that provides JavaScript optimization capabilities.\n *\n * The plugin uses both `esbuild` and `terser` to provide both fast and highly-optimized\n * code output. `esbuild` is used as an initial pass to remove the majority of unused code\n * as well as shorten identifiers. `terser` is then used as a secondary pass to apply\n * optimizations not yet implemented by `esbuild`.\n */\nexport class JavaScriptOptimizerPlugin {\n  private targets: string[] | undefined;\n\n  constructor(private options: JavaScriptOptimizerOptions) {\n    if (options.supportedBrowsers) {\n      this.targets = transformSupportedBrowsersToTargets(options.supportedBrowsers);\n    }\n  }\n\n  apply(compiler: Compiler) {\n    const { OriginalSource, SourceMapSource } = compiler.webpack.sources;\n\n    compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {\n      const logger = compilation.getLogger('build-angular.JavaScriptOptimizerPlugin');\n\n      compilation.hooks.processAssets.tapPromise(\n        {\n          name: PLUGIN_NAME,\n          stage: compiler.webpack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_SIZE,\n        },\n        async (compilationAssets) => {\n          logger.time('optimize js assets');\n          const scriptsToOptimize = [];\n          const cache =\n            compilation.options.cache && compilation.getCache('JavaScriptOptimizerPlugin');\n\n          // Analyze the compilation assets for scripts that require optimization\n          for (const assetName of Object.keys(compilationAssets)) {\n            if (!assetName.endsWith('.js')) {\n              continue;\n            }\n\n            const scriptAsset = compilation.getAsset(assetName);\n            // Skip assets that have already been optimized or are verbatim copies (project assets)\n            if (!scriptAsset || scriptAsset.info.minimized || scriptAsset.info.copied) {\n              continue;\n            }\n\n            const { source: scriptAssetSource, name } = scriptAsset;\n            let cacheItem;\n\n            if (cache) {\n              const eTag = cache.getLazyHashedEtag(scriptAssetSource);\n              cacheItem = cache.getItemCache(name, eTag);\n              const cachedOutput = await cacheItem.getPromise<\n                { source: sources.Source } | undefined\n              >();\n\n              if (cachedOutput) {\n                logger.debug(`${name} restored from cache`);\n                compilation.updateAsset(name, cachedOutput.source, (assetInfo) => ({\n                  ...assetInfo,\n                  minimized: true,\n                }));\n                continue;\n              }\n            }\n\n            const { source, map } = scriptAssetSource.sourceAndMap();\n            scriptsToOptimize.push({\n              name: scriptAsset.name,\n              code: typeof source === 'string' ? source : source.toString(),\n              map,\n              cacheItem,\n            });\n          }\n\n          if (scriptsToOptimize.length === 0) {\n            return;\n          }\n\n          // Ensure all replacement values are strings which is the expected type for esbuild\n          let define: Record<string, string> | undefined;\n          if (this.options.define) {\n            define = {};\n            for (const [key, value] of Object.entries(this.options.define)) {\n              define[key] = String(value);\n            }\n          }\n\n          // Setup the options used by all worker tasks\n          const optimizeOptions: OptimizeRequestOptions = {\n            sourcemap: this.options.sourcemap,\n            define,\n            keepIdentifierNames: this.options.keepIdentifierNames,\n            target: this.targets,\n            removeLicenses: this.options.removeLicenses,\n            advanced: this.options.advanced,\n            // Perform a single native esbuild support check.\n            // This removes the need for each worker to perform the check which would\n            // otherwise require spawning a separate process per worker.\n            alwaysUseWasm: !(await EsbuildExecutor.hasNativeSupport()),\n          };\n\n          // Sort scripts so larger scripts start first - worker pool uses a FIFO queue\n          scriptsToOptimize.sort((a, b) => a.code.length - b.code.length);\n\n          // Initialize the task worker pool\n          const workerPath = require.resolve('./javascript-optimizer-worker');\n          const workerPool = new Piscina({\n            filename: workerPath,\n            maxThreads: MAX_OPTIMIZE_WORKERS,\n          });\n\n          // Enqueue script optimization tasks and update compilation assets as the tasks complete\n          try {\n            const tasks = [];\n            for (const { name, code, map, cacheItem } of scriptsToOptimize) {\n              logger.time(`optimize asset: ${name}`);\n\n              tasks.push(\n                workerPool\n                  .run({\n                    asset: {\n                      name,\n                      code,\n                      map,\n                    },\n                    options: optimizeOptions,\n                  })\n                  .then(\n                    async ({ code, name, map, errors }) => {\n                      if (errors?.length) {\n                        for (const error of errors) {\n                          addError(compilation, `Optimization error [${name}]: ${error}`);\n                        }\n\n                        return;\n                      }\n\n                      const optimizedAsset = map\n                        ? new SourceMapSource(code, name, map)\n                        : new OriginalSource(code, name);\n                      compilation.updateAsset(name, optimizedAsset, (assetInfo) => ({\n                        ...assetInfo,\n                        minimized: true,\n                      }));\n\n                      logger.timeEnd(`optimize asset: ${name}`);\n\n                      return cacheItem?.storePromise({\n                        source: optimizedAsset,\n                      });\n                    },\n                    (error) => {\n                      addError(\n                        compilation,\n                        `Optimization error [${name}]: ${error.stack || error.message}`,\n                      );\n                    },\n                  ),\n              );\n            }\n\n            await Promise.all(tasks);\n          } finally {\n            void workerPool.destroy();\n          }\n\n          logger.timeEnd('optimize js assets');\n        },\n      );\n    });\n  }\n}\n"]}