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It should not be used with unpure modules.\n\n```typescript\n// input\nvar Clazz = (function () { function Clazz() { } return Clazz; }());\nvar newClazz = new Clazz();\nvar newClazzTwo = Clazz();\n\n// output\nvar Clazz = /*@__PURE__*/ (function () { function Clazz() { } return Clazz; }());\nvar newClazz = /*@__PURE__*/ new Clazz();\nvar newClazzTwo = /*@__PURE__*/ Clazz();\n```\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\n### Import tslib\n\nTypeScript helpers (`__extends/__decorate/__metadata/__param`) are replaced with `tslib` imports whenever found.\n\n```typescript\n// input\nvar __extends = (this && this.__extends) || function (d, b) {\n  for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n  function __() { this.constructor = d; }\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\n### Purify Plugin\n\nPerforms regex based replacements on all bundles that add `/*@__PURE__*/` comments to\nknown pure webpack imports (used with [Prefix functions](#prefix-functions)).\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```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\n## Webpack loader and plugin usage:\n\n```typescript\nconst PurifyPlugin = require('@angular-devkit/build-optimizer').PurifyPlugin;\n\nmodule.exports = {\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  plugins: [\n    new PurifyPlugin()\n  ]\n}\n```\n\n\n## CLI usage\n\n```bash\nbuild-optimizer input.js\nbuild-optimizer input.js output.js\npurify input.js\npurify input.js output.js\n```\n","engines":{"node":">=10.3.0 <11.0.0","yarn":">=1.6.0 <2.0.0"},"license":"MIT","typings":"src/index.d.ts","_npmUser":{"name":"angular","email":"devops+npm@angular.io"},"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":"6.2.0","description":"Angular Build Optimizer","directories":{},"maintainers":[{"name":"angular","email":"angular-core+npm@google.com"},{"name":"angular-devkit","email":"hansl@google.com"}],"_nodeVersion":"10.9.0","dependencies":{"source-map":"^0.5.6","typescript":"~3.0.1","loader-utils":"^1.1.0","webpack-sources":"^1.1.0"},"_hasShrinkwrap":false,"readmeFilename":"README.md","_npmOperationalInternal":{"tmp":"tmp/build-optimizer_0.9.0-beta.2_1536270551236_0.17523395843094036","host":"s3://npm-registry-packages"},"_id":"@angular-devkit/build-optimizer@0.9.0-beta.2","version":"0.9.0-beta.2"}