angular-cli/packages/angular_devkit/build_optimizer/src/build-optimizer/build-optimizer_spec.ts

/**
 * @license
 * Copyright Google Inc. 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
 */
// tslint:disable:no-big-function
// tslint:disable-next-line:no-implicit-dependencies
import { tags } from '@angular-devkit/core';
import { RawSourceMap } from 'source-map';
import { TransformJavascriptOutput } from '../helpers/transform-javascript';
import { buildOptimizer } from './build-optimizer';


describe('build-optimizer', () => {
  const imports = 'import { Injectable, Input, Component } from \'@angular/core\';';
  const clazz = 'var Clazz = (function () { function Clazz() { } return Clazz; }());';
  const decorators = 'Clazz.decorators = [ { type: Injectable } ];';

  describe('basic functionality', () => {
    it('applies scrub-file and prefix-functions to side-effect free modules', () => {
      const input = tags.stripIndent`
        ${imports}
        var __extends = (this && this.__extends) || function (d, b) {
            for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
            function __() { this.constructor = d; }
            d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
        };
        var ChangeDetectionStrategy;
        (function (ChangeDetectionStrategy) {
          ChangeDetectionStrategy[ChangeDetectionStrategy["OnPush"] = 0] = "OnPush";
          ChangeDetectionStrategy[ChangeDetectionStrategy["Default"] = 1] = "Default";
        })(ChangeDetectionStrategy || (ChangeDetectionStrategy = {}));
        ${clazz}
        ${decorators}
        Clazz.propDecorators = { 'ngIf': [{ type: Input }] };
        Clazz.ctorParameters = function () { return [{type: Injectable}]; };
        var ComponentClazz = (function () {
          function ComponentClazz() { }
          __decorate([
            Input(),
            __metadata("design:type", Object)
          ], Clazz.prototype, "selected", void 0);
          ComponentClazz = __decorate([
            Component({
              selector: 'app-root',
              templateUrl: './app.component.html',
              styleUrls: ['./app.component.css']
            }),
            __metadata("design:paramtypes", [Injectable])
          ], ComponentClazz);
          return ComponentClazz;
        }());
        var RenderType_MdOption = ɵcrt({ encapsulation: 2, styles: styles_MdOption});
      `;
      const output = tags.oneLine`
        import { __extends } from "tslib";
        ${imports}
        var ChangeDetectionStrategy = /*@__PURE__*/ (function (ChangeDetectionStrategy) {
          ChangeDetectionStrategy[ChangeDetectionStrategy["OnPush"] = 0] = "OnPush";
          ChangeDetectionStrategy[ChangeDetectionStrategy["Default"] = 1] = "Default";
          return ChangeDetectionStrategy;
        })({});
        var Clazz = /*@__PURE__*/ (function () { function Clazz() { } return Clazz; }());
        var ComponentClazz = /*@__PURE__*/ (function () {
          function ComponentClazz() { }
          return ComponentClazz;
        }());
        var RenderType_MdOption = /*@__PURE__*/ ɵcrt({ encapsulation: 2, styles: styles_MdOption });
      `;

      // Check Angular 4/5 and unix/windows paths.
      const inputPaths = [
        '/node_modules/@angular/core/@angular/core.es5.js',
        '/node_modules/@angular/core/esm5/core.js',
        '\\node_modules\\@angular\\core\\@angular\\core.es5.js',
        '\\node_modules\\@angular\\core\\esm5\\core.js',
        '/project/file.ngfactory.js',
        '/project/file.ngstyle.js',
      ];

      inputPaths.forEach((inputFilePath) => {
        const boOutput = buildOptimizer({ content: input, inputFilePath });
        expect(tags.oneLine`${boOutput.content}`).toEqual(output);
        expect(boOutput.emitSkipped).toEqual(false);
      });
    });

    it('supports flagging module as side-effect free', () => {
      const output = tags.oneLine`
        var RenderType_MdOption = /*@__PURE__*/ ɵcrt({ encapsulation: 2, styles: styles_MdOption });
      `;
      const input = tags.stripIndent`
        var RenderType_MdOption = ɵcrt({ encapsulation: 2, styles: styles_MdOption});
      `;

      const boOutput = buildOptimizer({ content: input, isSideEffectFree: true });
      expect(tags.oneLine`${boOutput.content}`).toEqual(output);
      expect(boOutput.emitSkipped).toEqual(false);
    });

    it('should not wrap classes which had all static properties dropped in IIFE', () => {
      const classDeclaration = tags.oneLine`
        import { Injectable } from '@angular/core';

        class Platform {
          constructor(_doc) {
          }
          init() {
          }
        }
      `;
      const input = tags.oneLine`
        ${classDeclaration}

        Platform.decorators = [
            { type: Injectable }
        ];

        /** @nocollapse */
        Platform.ctorParameters = () => [
            { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT] }] }
        ];
      `;

      const boOutput = buildOptimizer({ content: input, isSideEffectFree: true });
      expect(tags.oneLine`${boOutput.content}`).toEqual(classDeclaration);
      expect(boOutput.emitSkipped).toEqual(false);
    });
  });


  describe('resilience', () => {
    it('doesn\'t process files with invalid syntax by default', () => {
      const input = tags.oneLine`
        ))))invalid syntax
        ${clazz}
        Clazz.decorators = [ { type: Injectable } ];
      `;

      const boOutput = buildOptimizer({ content: input });
      expect(boOutput.content).toBeFalsy();
      expect(boOutput.emitSkipped).toEqual(true);
    });

    it('throws on files with invalid syntax in strict mode', () => {
      const input = tags.oneLine`
        ))))invalid syntax
        ${clazz}
        Clazz.decorators = [ { type: Injectable } ];
      `;

      expect(() => buildOptimizer({ content: input, strict: true })).toThrow();
    });

    // TODO: re-enable this test when updating to TypeScript >2.9.1.
    // The `prefix-classes` tests will also need to be adjusted.
    // See https://github.com/angular/devkit/pull/998#issuecomment-393867606 for more info.
    xit(`doesn't exceed call stack size when type checking very big classes`, () => {
      // BigClass with a thousand methods.
      // Clazz is included with ctorParameters to trigger transforms with type checking.
      const input = `
        var BigClass = /** @class */ (function () {
          function BigClass() {
          }
          ${Array.from(new Array(1000)).map((_v, i) =>
            `BigClass.prototype.method${i} = function () { return this.myVar; };`,
          ).join('\n')}
          return BigClass;
        }());
        ${clazz}
        Clazz.ctorParameters = function () { return []; };
      `;

      let boOutput: TransformJavascriptOutput;
      expect(() => {
        boOutput = buildOptimizer({ content: input });
        expect(boOutput.emitSkipped).toEqual(false);
      }).not.toThrow();
    });
  });

  describe('whitelisted modules', () => {
    // This statement is considered pure by getPrefixFunctionsTransformer on whitelisted modules.
    const input = 'console.log(42);';
    const output = '/*@__PURE__*/ console.log(42);';

    it('should process whitelisted modules', () => {
      const inputFilePath = '/node_modules/@angular/core/@angular/core.es5.js';
      const boOutput = buildOptimizer({ content: input, inputFilePath });
      expect(boOutput.content).toContain(output);
      expect(boOutput.emitSkipped).toEqual(false);
    });

    it('should not process non-whitelisted modules', () => {
      const inputFilePath = '/node_modules/other-package/core.es5.js';
      const boOutput = buildOptimizer({ content: input, inputFilePath });
      expect(boOutput.emitSkipped).toEqual(true);
    });

    it('should not process non-whitelisted umd modules', () => {
      const inputFilePath = '/node_modules/other_lib/index.js';
      const boOutput = buildOptimizer({ content: input, inputFilePath });
      expect(boOutput.emitSkipped).toEqual(true);
    });
  });

  describe('sourcemaps', () => {
    const transformableInput = tags.oneLine`
      ${imports}
      ${clazz}
      ${decorators}
    `;

    it('doesn\'t produce sourcemaps by default', () => {
      expect(buildOptimizer({ content: transformableInput }).sourceMap).toBeFalsy();
    });

    it('produces sourcemaps', () => {
      expect(buildOptimizer(
        { content: transformableInput, emitSourceMap: true },
      ).sourceMap).toBeTruthy();
    });

    // TODO: re-enable this test, it was temporarily disabled as part of
    // https://github.com/angular/devkit/pull/842
    xit('doesn\'t produce sourcemaps when emitting was skipped', () => {
      const ignoredInput = tags.oneLine`
        var Clazz = (function () { function Clazz() { } return Clazz; }());
      `;
      const invalidInput = tags.oneLine`
        ))))invalid syntax
        ${clazz}
        Clazz.decorators = [ { type: Injectable } ];
      `;

      const ignoredOutput = buildOptimizer({ content: ignoredInput, emitSourceMap: true });
      expect(ignoredOutput.emitSkipped).toBeTruthy();
      expect(ignoredOutput.sourceMap).toBeFalsy();

      const invalidOutput = buildOptimizer({ content: invalidInput, emitSourceMap: true });
      expect(invalidOutput.emitSkipped).toBeTruthy();
      expect(invalidOutput.sourceMap).toBeFalsy();
    });

    it('emits sources content', () => {
      const sourceMap = buildOptimizer(
        { content: transformableInput, emitSourceMap: true },
      ).sourceMap as RawSourceMap;
      const sourceContent = sourceMap.sourcesContent as string[];
      expect(sourceContent[0]).toEqual(transformableInput);
    });

    it('uses empty strings if inputFilePath and outputFilePath is not provided', () => {
      const { content, sourceMap } = buildOptimizer(
        { content: transformableInput, emitSourceMap: true });

      if (!sourceMap) {
        throw new Error('sourceMap was not generated.');
      }
      expect(sourceMap.file).toEqual('');
      expect(sourceMap.sources[0]).toEqual('');
      expect(content).not.toContain(`sourceMappingURL`);
    });

    it('uses inputFilePath and outputFilePath if provided', () => {
      const inputFilePath = '/path/to/file.js';
      const outputFilePath = '/path/to/file.bo.js';
      const { content, sourceMap } = buildOptimizer({
        content: transformableInput,
        emitSourceMap: true,
        inputFilePath,
        outputFilePath,
      });

      if (!sourceMap) {
        throw new Error('sourceMap was not generated.');
      }
      expect(sourceMap.file).toEqual(outputFilePath);
      expect(sourceMap.sources[0]).toEqual(inputFilePath);
      expect(content).toContain(`sourceMappingURL=${outputFilePath}.map`);
    });
  });

});