feat(language-service): add services to support editors (#12987)

modules/@angular/language-service/index.ts

@@ -0,0 +1,22 @@
+/**
+ * @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
+ */
+
+/**
+ * @module
+ * @description
+ * Entry point for all public APIs of the language service package.
+ */
+import * as ts from 'typescript';
+
+import {LanguageServicePlugin} from './src/ts_plugin';
+
+export {createLanguageService} from './src/language_service';
+export {Completion, Completions, Declaration, Declarations, Definition, Diagnostic, Diagnostics, Hover, HoverTextSection, LanguageService, LanguageServiceHost, Location, Span, TemplateSource, TemplateSources} from './src/types';
+export {TypeScriptServiceHost, createLanguageServiceFromTypescript} from './src/typescript_host';
+
+export default LanguageServicePlugin;