diff --git a/packages/language-service/bundles/BUILD.bazel b/packages/language-service/bundles/BUILD.bazel
index 7206dcc92b..20501ae5c9 100644
--- a/packages/language-service/bundles/BUILD.bazel
+++ b/packages/language-service/bundles/BUILD.bazel
@@ -7,6 +7,7 @@ ls_rollup_bundle(
         "fs": "fs",
         "path": "path",
         "typescript": "ts",
+        "typescript/lib/tsserverlibrary": "tsserverlibrary",
     },
     license_banner = "banner.js.txt",
     visibility = ["//packages/language-service:__pkg__"],
diff --git a/packages/language-service/src/ts_plugin.ts b/packages/language-service/src/ts_plugin.ts
index 4bd0f83c60..ac39c726ba 100644
--- a/packages/language-service/src/ts_plugin.ts
+++ b/packages/language-service/src/ts_plugin.ts
@@ -6,18 +6,19 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import * as ts from 'typescript';
+import * as ts from 'typescript/lib/tsserverlibrary';
 
 import {createLanguageService} from './language_service';
 import {Completion, Diagnostic, DiagnosticMessageChain} from './types';
 import {TypeScriptServiceHost} from './typescript_host';
 
-const projectHostMap = new WeakMap<any, TypeScriptServiceHost>();
+const projectHostMap = new WeakMap<ts.server.Project, TypeScriptServiceHost>();
 
-export function getExternalFiles(project: any): string[]|undefined {
+export function getExternalFiles(project: ts.server.Project): string[]|undefined {
   const host = projectHostMap.get(project);
   if (host) {
-    return host.getTemplateReferences();
+    const externalFiles = host.getTemplateReferences();
+    return externalFiles;
   }
 }
 
@@ -62,7 +63,7 @@ function diagnosticToDiagnostic(d: Diagnostic, file: ts.SourceFile): ts.Diagnost
   return result;
 }
 
-export function create(info: any /* ts.server.PluginCreateInfo */): ts.LanguageService {
+export function create(info: ts.server.PluginCreateInfo): ts.LanguageService {
   const oldLS: ts.LanguageService = info.languageService;
   const proxy: ts.LanguageService = Object.assign({}, oldLS);
   const logger = info.project.projectService.logger;
@@ -78,7 +79,7 @@ export function create(info: any /* ts.server.PluginCreateInfo */): ts.LanguageS
   }
 
   const serviceHost = new TypeScriptServiceHost(info.languageServiceHost, oldLS);
-  const ls = createLanguageService(serviceHost as any);
+  const ls = createLanguageService(serviceHost);
   serviceHost.setSite(ls);
   projectHostMap.set(info.project, serviceHost);
 
diff --git a/packages/language-service/test/ts_plugin_spec.ts b/packages/language-service/test/ts_plugin_spec.ts
index e792a8d439..5948391008 100644
--- a/packages/language-service/test/ts_plugin_spec.ts
+++ b/packages/language-service/test/ts_plugin_spec.ts
@@ -32,8 +32,13 @@ describe('plugin', () => {
   });
 
 
-  let plugin = create(
-      {ts: ts, languageService: service, project: mockProject, languageServiceHost: mockHost});
+  let plugin = create({
+    languageService: service,
+    project: mockProject as any,
+    languageServiceHost: mockHost,
+    serverHost: {} as any,
+    config: {},
+  });
 
   it('should not report template errors on tour of heroes', () => {
     for (let source of program !.getSourceFiles()) {