81 lines
3.1 KiB
TypeScript
81 lines
3.1 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as path from 'path';
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import * as ts from 'typescript';
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import {ReflectorHost} from '../src/reflector_host';
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import {TypeScriptServiceHost} from '../src/typescript_host';
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import {MockTypescriptHost} from './test_utils';
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describe('reflector_host_spec', () => {
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// Regression #21811
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it('should be able to find angular under windows', () => {
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const originalJoin = path.join;
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const originalPosixJoin = path.posix.join;
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const mockHost =
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new MockTypescriptHost(['/app/main.ts', '/app/parsing-cases.ts'], 'node_modules', {
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...path,
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join: (...args: string[]) => originalJoin.apply(path, args),
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posix: {...path.posix, join: (...args: string[]) => originalPosixJoin.apply(path, args)}
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});
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const reflectorHost = new ReflectorHost(() => undefined as any, mockHost);
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if (process.platform !== 'win32') {
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// If we call this in Windows it will cause a 'Maximum call stack size exceeded error'
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// Because we are spying on the same function that we are call faking
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spyOn(path, 'join').and.callFake((...args: string[]) => {
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return path.win32.join(...args);
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});
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}
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const result = reflectorHost.moduleNameToFileName('@angular/core');
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expect(result).not.toBeNull('could not find @angular/core using path.win32');
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});
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it('should use module resolution cache', () => {
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const mockHost = new MockTypescriptHost(['/app/main.ts']);
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// TypeScript relies on `ModuleResolutionHost.fileExists()` to perform
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// module resolution, so spy on this method to determine how many times
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// it's called.
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const spy = spyOn(mockHost, 'fileExists').and.callThrough();
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const tsLS = ts.createLanguageService(mockHost);
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// First count is zero due to lazy instantiation of the StaticReflector
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// and MetadataResolver.
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const ngLSHost = new TypeScriptServiceHost(mockHost, tsLS);
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const firstCount = spy.calls.count();
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expect(firstCount).toBe(0);
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spy.calls.reset();
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// Second count is due to resolution of the Tour of Heroes (toh) project.
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// This resolves all Angular directives in the project.
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ngLSHost.getAnalyzedModules();
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const secondCount = spy.calls.count();
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expect(secondCount).toBeGreaterThan(500);
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expect(secondCount).toBeLessThan(600);
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spy.calls.reset();
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// Third count is due to recompution after the program changes.
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mockHost.addCode(''); // this will mark project as dirty
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ngLSHost.getAnalyzedModules();
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const thirdCount = spy.calls.count();
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expect(thirdCount).toBeGreaterThan(0);
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expect(thirdCount).toBeLessThan(10);
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// Summary
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// | | First Count | Second Count | Third Count |
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// |---------------|-------------|--------------|-------------|
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// | Without Cache | 2581 | 6291 | 257 |
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// | With Cache | 26 | 550 | 84 |
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// | Improvement | ~100x | ~10x | ~3x |
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});
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});
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