diff --git a/modules/playground/e2e_test/example_test.bzl b/modules/playground/e2e_test/example_test.bzl
index 41fdc97a357..64da4af375c 100644
--- a/modules/playground/e2e_test/example_test.bzl
+++ b/modules/playground/e2e_test/example_test.bzl
@@ -1,6 +1,6 @@
 load("//tools:defaults.bzl", "protractor_web_test_suite", "ts_library")
 
-def example_test(name, srcs, server, data = [], **kwargs):
+def example_test(name, srcs, server, data = [], deps = [], **kwargs):
     ts_library(
         name = "%s_lib" % name,
         testonly = True,
@@ -12,7 +12,7 @@ def example_test(name, srcs, server, data = [], **kwargs):
             "@npm//@types/jasminewd2",
             "@npm//@types/selenium-webdriver",
             "@npm//protractor",
-        ],
+        ] + deps,
     )
 
     protractor_web_test_suite(
diff --git a/modules/playground/e2e_test/sourcemap/BUILD.bazel b/modules/playground/e2e_test/sourcemap/BUILD.bazel
index 943adc8d2ad..94ec1116806 100644
--- a/modules/playground/e2e_test/sourcemap/BUILD.bazel
+++ b/modules/playground/e2e_test/sourcemap/BUILD.bazel
@@ -8,4 +8,7 @@ example_test(
         "//modules/playground/src/sourcemap:index.ts",
     ],
     server = "//modules/playground/src/sourcemap:devserver",
+    deps = [
+        "@npm//source-map",
+    ],
 )
diff --git a/modules/playground/e2e_test/sourcemap/sourcemap_spec.ts b/modules/playground/e2e_test/sourcemap/sourcemap_spec.ts
index 2e51457d554..adcd5710124 100644
--- a/modules/playground/e2e_test/sourcemap/sourcemap_spec.ts
+++ b/modules/playground/e2e_test/sourcemap/sourcemap_spec.ts
@@ -6,11 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {readFileSync} from 'fs';
 import {$, browser} from 'protractor';
 import {logging} from 'selenium-webdriver';
-
-const fs = require('fs');
-const sourceMap = require('source-map');
+import {RawSourceMap, SourceMapConsumer} from 'source-map';
 
 describe('sourcemaps', function() {
   const URL = '/';
@@ -36,19 +35,18 @@ describe('sourcemaps', function() {
 
 
       const content =
-          fs.readFileSync(require.resolve('../../src/sourcemap/index.js')).toString('utf8');
+          readFileSync(require.resolve('../../src/sourcemap/index.js')).toString('utf8');
       const marker = '//# sourceMappingURL=data:application/json;base64,';
       const index = content.indexOf(marker);
       const sourceMapData =
           Buffer.from(content.substring(index + marker.length), 'base64').toString('utf8');
 
-      const decoder = new sourceMap.SourceMapConsumer(JSON.parse(sourceMapData));
+      const decoder = new SourceMapConsumer(JSON.parse(sourceMapData) as RawSourceMap);
 
       const originalPosition = decoder.originalPositionFor({line: errorLine, column: errorColumn});
-
-      const sourceCodeLines = fs.readFileSync(require.resolve('../../src/sourcemap/index.ts'), {
-                                  encoding: 'UTF-8'
-                                }).split('\n');
+      const sourceCodeLines = readFileSync(require.resolve('../../src/sourcemap/index.ts'), {
+                                encoding: 'UTF-8'
+                              }).split('\n');
       expect(sourceCodeLines[originalPosition.line - 1])
           .toMatch(/throw new Error\(\'Sourcemap test\'\)/);
     });
diff --git a/packages/compiler/src/aot/summary_serializer.ts b/packages/compiler/src/aot/summary_serializer.ts
index ccf517b65fc..956910f3116 100644
--- a/packages/compiler/src/aot/summary_serializer.ts
+++ b/packages/compiler/src/aot/summary_serializer.ts
@@ -461,7 +461,7 @@ class FromJsonDeserializer extends ValueTransformer {
     summaries: Summary<StaticSymbol>[],
     importAs: {symbol: StaticSymbol, importAs: StaticSymbol}[]
   } {
-    const data: {moduleName: string|null, summaries: any[], symbols: any[]} = JSON.parse(json);
+    const data = JSON.parse(json) as {moduleName: string | null, summaries: any[], symbols: any[]};
     const allImportAs: {symbol: StaticSymbol, importAs: StaticSymbol}[] = [];
     this.symbols = data.symbols.map(
         (serializedSymbol) => this.symbolCache.get(
diff --git a/packages/compiler/test/aot/test_util.ts b/packages/compiler/test/aot/test_util.ts
index 41d6a3858f1..bb37cf06fed 100644
--- a/packages/compiler/test/aot/test_util.ts
+++ b/packages/compiler/test/aot/test_util.ts
@@ -427,7 +427,7 @@ export class MockAotCompilerHost implements AotCompilerHost {
       if (this.metadataVisible) {
         const metadataPath = modulePath.replace(DTS, '.metadata.json');
         if (this.tsHost.fileExists(metadataPath)) {
-          let result = JSON.parse(this.tsHost.readFile(metadataPath));
+          let result = JSON.parse(this.tsHost.readFile(metadataPath)) as {[key: string]: any}[];
           return Array.isArray(result) ? result : [result];
         }
       }