angular-docs-cn/packages/compiler/test/output/output_jit_spec.ts

/**
 * @license
 * Copyright Google LLC 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 {EmitterVisitorContext} from '@angular/compiler/src/output/abstract_emitter';
import * as o from '@angular/compiler/src/output/output_ast';
import {JitEmitterVisitor, JitEvaluator} from '@angular/compiler/src/output/output_jit';
import {R3JitReflector} from '@angular/compiler/src/render3/r3_jit';
import {newArray} from '@angular/compiler/src/util';
import {JitReflector} from '@angular/platform-browser-dynamic/src/compiler_reflector';

const anotherModuleUrl = 'somePackage/someOtherPath';

{
  describe('Output JIT', () => {
    describe('regression', () => {
      it('should generate unique argument names', () => {
        const externalIds = newArray(10, 1).map(
            (_, index) =>
                new o.ExternalReference(anotherModuleUrl, `id_${index}_`, {name: `id_${index}_`}));
        const externalIds1 = newArray(10, 1).map(
            (_, index) => new o.ExternalReference(
                anotherModuleUrl, `id_${index}_1`, {name: `id_${index}_1`}));
        const ctx = EmitterVisitorContext.createRoot();
        const converter = new JitEmitterVisitor(new JitReflector());
        converter.visitAllStatements(
            [o.literalArr([...externalIds1, ...externalIds].map(id => o.importExpr(id))).toStmt()],
            ctx);
        const args = converter.getArgs();
        expect(Object.keys(args).length).toBe(20);
      });
    });

    it('should use strict mode', () => {
      const evaluator = new JitEvaluator();
      expect(() => {
        evaluator.evaluateStatements(
            'http://angular.io/something.ts',
            [
              // Set an undeclared variable
              // foo = "bar";
              o.variable('foo').equals(o.literal('bar')).toStmt(),
            ],
            new R3JitReflector({}), false);
      }).toThrowError();
    });

    it('should not add more than one strict mode statement if there is already one present', () => {
      const converter = new JitEmitterVisitor(new JitReflector());
      const ctx = EmitterVisitorContext.createRoot();
      converter.visitAllStatements(
          [
            o.literal('use strict').toStmt(),
          ],
          ctx);
      const matches = ctx.toSource().match(/'use strict';/g)!;
      expect(matches.length).toBe(1);
    });
  });
}