refactor(@ngtools/webpack): remove redundant webpack-sources dependency

The `webpack` package now exports the `Source` based classes directly.

Author: clydin

packages/ngtools/webpack/BUILD.bazel

@@ -37,11 +37,9 @@ ts_library(
     deps = [
         "@npm//@angular/compiler-cli",
         "@npm//@types/node",
-        "@npm//@types/webpack-sources",
         "@npm//enhanced-resolve",
         "@npm//typescript",
         "@npm//webpack",
-        "@npm//webpack-sources",
     ],
 )
 

packages/ngtools/webpack/package.json

@@ -21,8 +21,7 @@
   },
   "homepage": "https://github.com/angular/angular-cli/tree/master/packages/@ngtools/webpack",
   "dependencies": {
-    "enhanced-resolve": "5.7.0",
-    "webpack-sources": "2.2.0"
+    "enhanced-resolve": "5.7.0"
   },
   "peerDependencies": {
     "@angular/compiler-cli": "^12.0.0-next",

packages/ngtools/webpack/src/resource_loader.ts

@@ -6,8 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import * as vm from 'vm';
-import { Compilation, EntryPlugin, NormalModule, library, node } from 'webpack';
-import { RawSource } from 'webpack-sources';
+import { Compilation, EntryPlugin, NormalModule, library, node, sources } from 'webpack';
 import { normalizePath } from './ivy/paths';
 
 interface CompilationOutput {
@@ -136,9 +135,7 @@ export class WebpackResourceLoader {
             const output = this._evaluate(outputFilePath, asset.source().toString());
 
             if (typeof output === 'string') {
-              // `webpack-sources` package has incomplete typings
-              // tslint:disable-next-line: no-any
-              compilation.assets[outputFilePath] = new RawSource(output) as any;
+              compilation.assets[outputFilePath] = new sources.RawSource(output);
             }
           } catch (error) {
             // Use compilation errors, as otherwise webpack will choke