component_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
 */
import {CycleAnalyzer, ImportGraph} from '../../cycles';
import {ErrorCode, FatalDiagnosticError} from '../../diagnostics';
import {absoluteFrom} from '../../file_system';
import {runInEachFileSystem} from '../../file_system/testing';
import {ModuleResolver, NOOP_DEFAULT_IMPORT_RECORDER, ReferenceEmitter} from '../../imports';
import {CompoundMetadataReader, DtsMetadataReader, LocalMetadataRegistry} from '../../metadata';
import {PartialEvaluator} from '../../partial_evaluator';
import {TypeScriptReflectionHost, isNamedClassDeclaration} from '../../reflection';
import {LocalModuleScopeRegistry, MetadataDtsModuleScopeResolver} from '../../scope';
import {getDeclaration, makeProgram} from '../../testing';
import {ResourceLoader} from '../src/api';
import {ComponentDecoratorHandler} from '../src/component';

export class NoopResourceLoader implements ResourceLoader {
  resolve(): string { throw new Error('Not implemented.'); }
  canPreload = false;
  load(): string { throw new Error('Not implemented'); }
  preload(): Promise<void>|undefined { throw new Error('Not implemented'); }
}
runInEachFileSystem(() => {
  describe('ComponentDecoratorHandler', () => {
    let _: typeof absoluteFrom;
    beforeEach(() => _ = absoluteFrom);

    it('should produce a diagnostic when @Component has non-literal argument', () => {
      const {program, options, host} = makeProgram([
        {
          name: _('/node_modules/@angular/core/index.d.ts'),
          contents: 'export const Component: any;',
        },
        {
          name: _('/entry.ts'),
          contents: `
          import {Component} from '@angular/core';

          const TEST = '';
          @Component(TEST) class TestCmp {}
      `
        },
      ]);
      const checker = program.getTypeChecker();
      const reflectionHost = new TypeScriptReflectionHost(checker);
      const evaluator = new PartialEvaluator(reflectionHost, checker);
      const moduleResolver = new ModuleResolver(program, options, host);
      const importGraph = new ImportGraph(moduleResolver);
      const cycleAnalyzer = new CycleAnalyzer(importGraph);
      const metaRegistry = new LocalMetadataRegistry();
      const dtsReader = new DtsMetadataReader(checker, reflectionHost);
      const scopeRegistry = new LocalModuleScopeRegistry(
          metaRegistry, new MetadataDtsModuleScopeResolver(dtsReader, null),
          new ReferenceEmitter([]), null);
      const metaReader = new CompoundMetadataReader([metaRegistry, dtsReader]);
      const refEmitter = new ReferenceEmitter([]);

      const handler = new ComponentDecoratorHandler(
          reflectionHost, evaluator, metaRegistry, metaReader, scopeRegistry, scopeRegistry, false,
          new NoopResourceLoader(), [''], false, true, moduleResolver, cycleAnalyzer, refEmitter,
          NOOP_DEFAULT_IMPORT_RECORDER);
      const TestCmp = getDeclaration(program, _('/entry.ts'), 'TestCmp', isNamedClassDeclaration);
      const detected = handler.detect(TestCmp, reflectionHost.getDecoratorsOfDeclaration(TestCmp));
      if (detected === undefined) {
        return fail('Failed to recognize @Component');
      }
      try {
        handler.analyze(TestCmp, detected.metadata);
        return fail('Analysis should have failed');
      } catch (err) {
        if (!(err instanceof FatalDiagnosticError)) {
          return fail('Error should be a FatalDiagnosticError');
        }
        const diag = err.toDiagnostic();
        expect(diag.code).toEqual(ivyCode(ErrorCode.DECORATOR_ARG_NOT_LITERAL));
        expect(diag.file.fileName.endsWith('entry.ts')).toBe(true);
        expect(diag.start).toBe(detected.metadata.args ![0].getStart());
      }
    });
  });

  function ivyCode(code: ErrorCode): number { return Number('-99' + code.valueOf()); }
});