fix(compiler): emit quoted object literal keys if the source is quoted

feat(tsc-wrapped): recored when to quote a object literal key

Collecting quoted literals is off by default as it introduces
a breaking change in the .metadata.json file. A follow-up commit
will address this.

Fixes #13249
Closes #13356

modules/@angular/compiler/test/output/ts_emitter_node_only_spec.ts

@@ -0,0 +1,72 @@
+/**
+ * @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 {StaticReflector, StaticReflectorHost, StaticSymbol} from '@angular/compiler';
+import * as o from '@angular/compiler/src/output/output_ast';
+import {ImportResolver} from '@angular/compiler/src/output/path_util';
+import {TypeScriptEmitter} from '@angular/compiler/src/output/ts_emitter';
+import {convertValueToOutputAst} from '@angular/compiler/src/output/value_util';
+import {MetadataCollector, isClassMetadata, isMetadataSymbolicCallExpression} from '@angular/tsc-wrapped';
+import * as ts from 'typescript';
+
+describe('TypeScriptEmitter (node only)', () => {
+  it('should quote identifiers quoted in the source', () => {
+    const sourceText = `
+      import {Component} from '@angular/core';
+
+      @Component({
+        providers: [{ provide: 'SomeToken', useValue: {a: 1, 'b': 2, c: 3, 'd': 4}}]
+      })
+      export class MyComponent {}
+    `;
+    const source = ts.createSourceFile('test.ts', sourceText, ts.ScriptTarget.Latest);
+    const collector = new MetadataCollector({quotedNames: true});
+    const stubHost = new StubReflectorHost();
+    const reflector = new StaticReflector(stubHost);
+
+    // Get the metadata from the above source
+    const metadata = collector.getMetadata(source);
+    const componentMetadata = metadata.metadata['MyComponent'];
+
+    // Get the first argument of the decorator call which is passed to @Component
+    expect(isClassMetadata(componentMetadata)).toBeTruthy();
+    if (!isClassMetadata(componentMetadata)) return;
+    const decorators = componentMetadata.decorators;
+    const firstDecorator = decorators[0];
+    expect(isMetadataSymbolicCallExpression(firstDecorator)).toBeTruthy();
+    if (!isMetadataSymbolicCallExpression(firstDecorator)) return;
+    const firstArgument = firstDecorator.arguments[0];
+
+    // Simplify this value using the StaticReflector
+    const context = reflector.getStaticSymbol('none', 'none');
+    const argumentValue = reflector.simplify(context, firstArgument);
+
+    // Convert the value to an output AST
+    const outputAst = convertValueToOutputAst(argumentValue);
+    const statement = outputAst.toStmt();
+
+    // Convert the value to text using the typescript emitter
+    const emitter = new TypeScriptEmitter(new StubImportResolver());
+    const text = emitter.emitStatements('module', [statement], []);
+
+    // Expect the keys for 'b' and 'd' to be quoted but 'a' and 'c' not to be.
+    expect(text).toContain('\'b\': 2');
+    expect(text).toContain('\'d\': 4');
+    expect(text).not.toContain('\'a\'');
+    expect(text).not.toContain('\'c\'');
+  });
+});
+
+class StubReflectorHost implements StaticReflectorHost {
+  getMetadataFor(modulePath: string): {[key: string]: any}[] { return []; }
+  moduleNameToFileName(moduleName: string, containingFile: string): string { return ''; }
+}
+
+class StubImportResolver extends ImportResolver {
+  fileNameToModuleName(importedFilePath: string, containingFilePath: string): string { return ''; }
+}