diff --git a/modules/benchmarks/e2e_test/largeform_perf.ts b/modules/benchmarks/e2e_test/largeform_perf.ts
index 63aaebd3ed..42165a0358 100644
--- a/modules/benchmarks/e2e_test/largeform_perf.ts
+++ b/modules/benchmarks/e2e_test/largeform_perf.ts
@@ -29,7 +29,7 @@ describe('largeform benchmark perf', () => {
 
   [CreateAndDestroyWorker].forEach((worker) => {
     describe(worker.id, () => {
-      it('should run for ng2', (done: any) => {
+      it('should run for ng2', done => {
         runLargeFormBenchmark({
           id: `largeform.ng2.${worker.id}`,
           url: 'all/benchmarks/src/largeform/ng2/index.html',
diff --git a/modules/benchmarks/e2e_test/largetable_perf.ts b/modules/benchmarks/e2e_test/largetable_perf.ts
index 045c5ef56a..2cfabb9634 100644
--- a/modules/benchmarks/e2e_test/largetable_perf.ts
+++ b/modules/benchmarks/e2e_test/largetable_perf.ts
@@ -40,7 +40,7 @@ describe('largetable benchmark perf', () => {
 
   [CreateOnlyWorker, CreateAndDestroyWorker, UpdateWorker].forEach((worker) => {
     describe(worker.id, () => {
-      it('should run for ng2', (done: any) => {
+      it('should run for ng2', done => {
         runTableBenchmark({
           id: `largeTable.ng2.${worker.id}`,
           url: 'all/benchmarks/src/largetable/ng2/index.html',
@@ -48,7 +48,7 @@ describe('largetable benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should run for ng2 with ngSwitch', (done: any) => {
+      it('should run for ng2 with ngSwitch', done => {
         runTableBenchmark({
           id: `largeTable.ng2_switch.${worker.id}`,
           url: 'all/benchmarks/src/largetable/ng2_switch/index.html',
@@ -56,7 +56,7 @@ describe('largetable benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should run for render3', (done: any) => {
+      it('should run for render3', done => {
         runTableBenchmark({
           id: `largeTable.render3.${worker.id}`,
           url: 'all/benchmarks/src/largetable/render3/index.html',
@@ -65,7 +65,7 @@ describe('largetable benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should run for iv', (done: any) => {
+      it('should run for iv', done => {
         runTableBenchmark({
           id: `largeTable.iv.${worker.id}`,
           url: 'all/benchmarks/src/largetable/iv/index.html',
@@ -74,7 +74,7 @@ describe('largetable benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should run for the baseline', (done: any) => {
+      it('should run for the baseline', done => {
         runTableBenchmark({
           id: `largeTable.baseline.${worker.id}`,
           url: 'all/benchmarks/src/largetable/baseline/index.html',
@@ -83,7 +83,7 @@ describe('largetable benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should run for incremental-dom', (done: any) => {
+      it('should run for incremental-dom', done => {
         runTableBenchmark({
           id: `largeTable.incremental_dom.${worker.id}`,
           url: 'all/benchmarks/src/largetable/incremental_dom/index.html',
diff --git a/modules/benchmarks/e2e_test/tree_perf.ts b/modules/benchmarks/e2e_test/tree_perf.ts
index ceddb69ed1..12034c7e07 100644
--- a/modules/benchmarks/e2e_test/tree_perf.ts
+++ b/modules/benchmarks/e2e_test/tree_perf.ts
@@ -24,7 +24,7 @@ describe('tree benchmark perf', () => {
   Benchmarks.forEach(benchmark => {
     describe(benchmark.id, () => {
       // This is actually a destroyOnly benchmark
-      it('should work for createOnly', (done: any) => {
+      it('should work for createOnly', done => {
         runTreeBenchmark({
           id: 'createOnly',
           benchmark,
@@ -33,7 +33,7 @@ describe('tree benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should work for createOnlyForReal', (done: any) => {
+      it('should work for createOnlyForReal', done => {
         runTreeBenchmark({
           id: 'createOnlyForReal',
           benchmark,
@@ -42,7 +42,7 @@ describe('tree benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should work for createDestroy', (done: any) => {
+      it('should work for createDestroy', done => {
         runTreeBenchmark({
           id: 'createDestroy',
           benchmark,
@@ -53,13 +53,13 @@ describe('tree benchmark perf', () => {
         }).then(done, done.fail);
       });
 
-      it('should work for update', (done: any) => {
+      it('should work for update', done => {
         runTreeBenchmark({id: 'update', benchmark, work: () => $(CreateBtn).click()})
             .then(done, done.fail);
       });
 
       if (benchmark.buttons.indexOf(DetectChangesBtn) !== -1) {
-        it('should work for detectChanges', (done: any) => {
+        it('should work for detectChanges', done => {
           runTreeBenchmark({
             id: 'detectChanges',
             benchmark,
diff --git a/modules/benchmarks/src/largetable/largetable_perf.spec.ts b/modules/benchmarks/src/largetable/largetable_perf.spec.ts
index 90d08cc24f..29408c1ffd 100644
--- a/modules/benchmarks/src/largetable/largetable_perf.spec.ts
+++ b/modules/benchmarks/src/largetable/largetable_perf.spec.ts
@@ -41,7 +41,7 @@ describe('largetable benchmark perf', () => {
 
   [CreateOnlyWorker, CreateAndDestroyWorker, UpdateWorker].forEach((worker) => {
     describe(worker.id, () => {
-      it('should run for render3', (done) => {
+      it('should run for render3', done => {
         runTableBenchmark({
           id: `largeTable.render3.${worker.id}`,
           url: 'index.html',
diff --git a/packages/core/test/bundling/hello_world_r2/treeshaking_spec.ts b/packages/core/test/bundling/hello_world_r2/treeshaking_spec.ts
index 66882ac549..45ea9d78ce 100644
--- a/packages/core/test/bundling/hello_world_r2/treeshaking_spec.ts
+++ b/packages/core/test/bundling/hello_world_r2/treeshaking_spec.ts
@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {withBody} from '@angular/core/testing';
 import * as fs from 'fs';
 import * as path from 'path';
 
diff --git a/packages/core/testing/src/render3.ts b/packages/core/testing/src/render3.ts
index e7cdcd3a64..94f359be17 100644
--- a/packages/core/testing/src/render3.ts
+++ b/packages/core/testing/src/render3.ts
@@ -35,18 +35,14 @@
 * @param blockFn function to wrap. The function can return promise or be `async`.
 * @experimental
 */
-export function withBody<T>(html: string, blockFn: T): T {
-  return function(done: {(): void, fail(): void}) {
+export function withBody<T extends Function>(html: string, blockFn: T): T {
+  return function(done: DoneFn) {
     ensureDocument();
-    let returnValue: any = undefined;
     if (typeof blockFn === 'function') {
       document.body.innerHTML = html;
-      // TODO(i): I'm not sure why a cast is required here but otherwise I get
-      //   TS2349: Cannot invoke an expression whose type lacks a call signature. Type 'never' has
-      //   no compatible call signatures.
-      let blockReturn = (blockFn as any)();
+      const blockReturn = blockFn();
       if (blockReturn instanceof Promise) {
-        blockReturn = blockReturn.then(done, done.fail);
+        blockReturn.then(done, done.fail);
       } else {
         done();
       }
@@ -124,4 +120,4 @@ export function cleanupDocument(): void {
 }
 
 if (typeof beforeEach == 'function') beforeEach(ensureDocument);
-if (typeof afterEach == 'function') beforeEach(cleanupDocument);
\ No newline at end of file
+if (typeof afterEach == 'function') beforeEach(cleanupDocument);
diff --git a/packages/platform-browser-dynamic/test/testing_public_browser_spec.ts b/packages/platform-browser-dynamic/test/testing_public_browser_spec.ts
index f219a92ffe..70d733e1bb 100644
--- a/packages/platform-browser-dynamic/test/testing_public_browser_spec.ts
+++ b/packages/platform-browser-dynamic/test/testing_public_browser_spec.ts
@@ -104,9 +104,9 @@ class BadTemplateUrl {
           reject = rej;
         });
         originalJasmineIt = jasmine.getEnv().it;
-        jasmine.getEnv().it = (description: string, fn: any /** TODO #9100 */): any => {
-          const done = () => { resolve(null); };
-          (<any>done).fail = (err: any /** TODO #9100 */) => { reject(err); };
+        jasmine.getEnv().it = (description: string, fn: (done: DoneFn) => void): any => {
+          const done = (() => resolve(null)) as DoneFn;
+          done.fail = reject;
           fn(done);
           return null;
         };
@@ -115,7 +115,7 @@ class BadTemplateUrl {
 
       const restoreJasmineIt = () => { jasmine.getEnv().it = originalJasmineIt; };
 
-      it('should fail when an ResourceLoader fails', (done: any /** TODO #9100 */) => {
+      it('should fail when an ResourceLoader fails', done => {
         const itPromise = patchJasmineIt();
 
         it('should fail with an error from a promise', async(() => {
diff --git a/tools/public_api_guard/core/testing.d.ts b/tools/public_api_guard/core/testing.d.ts
index f7676a5f27..391d63920f 100644
--- a/tools/public_api_guard/core/testing.d.ts
+++ b/tools/public_api_guard/core/testing.d.ts
@@ -148,7 +148,7 @@ export declare type TestModuleMetadata = {
 export declare function tick(millis?: number): void;
 
 /** @experimental */
-export declare function withBody<T>(html: string, blockFn: T): T;
+export declare function withBody<T extends Function>(html: string, blockFn: T): T;
 
 /** @experimental */
 export declare function withModule(moduleDef: TestModuleMetadata): InjectSetupWrapper;
diff --git a/tools/types-ext/jasminewd2.d.ts b/tools/types-ext/jasminewd2.d.ts
index b02a501695..3f87bc26ae 100644
--- a/tools/types-ext/jasminewd2.d.ts
+++ b/tools/types-ext/jasminewd2.d.ts
@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+/// <reference types="jasminewd2" />
+
 /**
  * Extended typings for `jasminewd2`.
  *