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It should not be used with unpure modules.\n\n```typescript\n// input\nvar Clazz = (function () {\n  function Clazz() {}\n  return Clazz;\n})();\nvar newClazz = new Clazz();\nvar newClazzTwo = Clazz();\n\n// output\nvar Clazz = /*@__PURE__*/ (function () {\n  function Clazz() {}\n  return Clazz;\n})();\nvar newClazz = /*@__PURE__*/ new Clazz();\nvar newClazzTwo = /*@__PURE__*/ Clazz();\n```\n\n### Prefix Classes\n\nAdds `/*@__PURE__*/` to downleveled TypeScript classes.\n\n```typescript\n// input\nvar ReplayEvent = (function () {\n  function ReplayEvent(time, value) {\n    this.time = time;\n    this.value = value;\n  }\n  return ReplayEvent;\n})();\n\n// output\nvar ReplayEvent = /*@__PURE__*/ (function () {\n  function ReplayEvent(time, value) {\n    this.time = time;\n    this.value = value;\n  }\n  return ReplayEvent;\n})();\n```\n\n### Import tslib\n\nTypeScript helpers (`__extends/__decorate/__metadata/__param`) are replaced with `tslib` imports whenever found.\n\n```typescript\n// input\nvar __extends =\n  (this && this.__extends) ||\n  function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() {\n      this.constructor = d;\n    }\n    d.prototype = b === null ? Object.create(b) : ((__.prototype = b.prototype), new __());\n  };\n\n// output\nimport { __extends } from 'tslib';\n```\n\n### Wrap enums\n\nWrap downleveled TypeScript enums in a function, and adds `/*@__PURE__*/` comment.\n\n```typescript\n// input\nvar ChangeDetectionStrategy;\n(function (ChangeDetectionStrategy) {\n  ChangeDetectionStrategy[(ChangeDetectionStrategy['OnPush'] = 0)] = 'OnPush';\n  ChangeDetectionStrategy[(ChangeDetectionStrategy['Default'] = 1)] = 'Default';\n})(ChangeDetectionStrategy || (ChangeDetectionStrategy = {}));\n\n// output\nvar ChangeDetectionStrategy = /*@__PURE__*/ (function () {\n  var ChangeDetectionStrategy = {};\n  ChangeDetectionStrategy[(ChangeDetectionStrategy['OnPush'] = 0)] = 'OnPush';\n  ChangeDetectionStrategy[(ChangeDetectionStrategy['Default'] = 1)] = 'Default';\n  return ChangeDetectionStrategy;\n})();\n```\n\n## Library Usage\n\n```typescript\nimport { buildOptimizer } from '@angular-devkit/build-optimizer';\n\nconst transpiledContent = buildOptimizer({ content: input }).content;\n```\n\nAvailable options:\n\n```typescript\nexport interface BuildOptimizerOptions {\n  content?: string;\n  inputFilePath?: string;\n  outputFilePath?: string;\n  emitSourceMap?: boolean;\n  strict?: boolean;\n  isSideEffectFree?: boolean;\n}\n```\n\n## Webpack loader usage:\n\n```typescript\nimport { BuildOptimizerWebpackPlugin } from '@angular-devkit/build-optimizer';\n\nmodule.exports = {\n  plugins: [\n    new BuildOptimizerWebpackPlugin(),\n  ]\n  module: {\n    rules: [\n      {\n        test: /\\.js$/,\n        loader: '@angular-devkit/build-optimizer/webpack-loader',\n        options: {\n          sourceMap: false\n        }\n      }\n    ]\n  }\n}\n```\n\n## CLI usage\n\n```bash\nbuild-optimizer input.js\nbuild-optimizer input.js output.js\n```\n","engines":{"npm":"^6.11.0 || ^7.5.6 || >=8.0.0","node":"^12.14.1 || >=14.0.0","yarn":">= 1.13.0"},"license":"MIT","typings":"src/index.d.ts","_npmUser":{"name":"google-wombot","email":"node-team-npm+wombot@google.com"},"homepage":"https://github.com/angular/angular-cli","keywords":["angular","Angular CLI","devkit","sdk","Angular DevKit"],"repository":{"url":"git+https://github.com/angular/angular-cli.git","type":"git"},"_npmVersion":"6.14.12","description":"Angular Build Optimizer","directories":{},"maintainers":[{"name":"angular","email":"devops+npm@angular.io"},{"name":"angular-devkit","email":"devops+npm@angular.io"},{"name":"google-wombot","email":"node-team-npm+wombot@google.com"}],"_nodeVersion":"14.16.1","dependencies":{"tslib":"2.3.0","source-map":"0.7.3","typescript":"4.3.5"},"experimental":true,"_hasShrinkwrap":false,"readmeFilename":"README.md","peerDependencies":{"webpack":"^5.30.0"},"peerDependenciesMeta":{"webpack":{"optional":true}},"_npmOperationalInternal":{"tmp":"tmp/build-optimizer_0.1202.16_1643652751363_0.7857554010349095","host":"s3://npm-registry-packages"},"_id":"@angular-devkit/build-optimizer@0.1202.16","version":"0.1202.16"}