diff --git a/packages/angular_devkit/build_angular/src/babel/webpack-loader.ts b/packages/angular_devkit/build_angular/src/babel/webpack-loader.ts
index 43ea083c2d66..743f94b748d2 100644
--- a/packages/angular_devkit/build_angular/src/babel/webpack-loader.ts
+++ b/packages/angular_devkit/build_angular/src/babel/webpack-loader.ts
@@ -14,7 +14,7 @@ import { ApplicationPresetOptions, I18nPluginCreators } from './presets/applicat
 interface AngularCustomOptions extends Omit<ApplicationPresetOptions, 'instrumentCode'> {
   instrumentCode?: {
     /** node_modules and test files are always excluded. */
-    excludedPaths: Set<String>;
+    excludedPaths: Set<string>;
     includedBasePath: string;
   };
 }
diff --git a/packages/angular_devkit/build_angular/src/utils/normalize-asset-patterns.ts b/packages/angular_devkit/build_angular/src/utils/normalize-asset-patterns.ts
index 4bc6ee52cbd6..b020b791a715 100644
--- a/packages/angular_devkit/build_angular/src/utils/normalize-asset-patterns.ts
+++ b/packages/angular_devkit/build_angular/src/utils/normalize-asset-patterns.ts
@@ -12,7 +12,7 @@ import * as path from 'path';
 import { AssetPattern, AssetPatternClass } from '../builders/browser/schema';
 
 export class MissingAssetSourceRootException extends BaseException {
-  constructor(path: String) {
+  constructor(path: string) {
     super(`The ${path} asset path must start with the project source root.`);
   }
 }
diff --git a/packages/angular_devkit/build_angular/src/utils/normalize-file-replacements.ts b/packages/angular_devkit/build_angular/src/utils/normalize-file-replacements.ts
index 741079ffded9..377dafdabad4 100644
--- a/packages/angular_devkit/build_angular/src/utils/normalize-file-replacements.ts
+++ b/packages/angular_devkit/build_angular/src/utils/normalize-file-replacements.ts
@@ -12,7 +12,7 @@ import * as path from 'path';
 import { FileReplacement } from '../builders/browser/schema';
 
 export class MissingFileReplacementException extends BaseException {
-  constructor(path: String) {
+  constructor(path: string) {
     super(`The ${path} path in file replacements does not exist.`);
   }
 }