Revert "fix(@angular-devkit/build-angular): control linker template s…

…ourcemapping via builder sourcemap options"

This reverts commit d4c5f85.

Following a debugging and investigation with @petebacondarwin it appears that when the external template handling in the linker generates Babel AST nodes that reference the external template files which breaks Babel when it tried to flatten final source-map, which ends up no emitting any source-maps.

As an interim solution we should revert this.

Closes #21271

packages/angular_devkit/build_angular/src/babel/presets/application.ts

@@ -20,7 +20,6 @@ export interface ApplicationPresetOptions {
   angularLinker?: {
     shouldLink: boolean;
     jitMode: boolean;
-    sourcemap: boolean;
   };
 
   forceES5?: boolean;
@@ -138,7 +137,6 @@ export default function (api: unknown, options: ApplicationPresetOptions) {
     plugins.push(
       createEs2015LinkerPlugin({
         linkerJitMode: options.angularLinker.jitMode,
-        sourceMapping: options.angularLinker.sourcemap,
         logger: createNgtscLogger(options.diagnosticReporter),
         fileSystem: {
           resolve: path.resolve,

packages/angular_devkit/build_angular/src/babel/webpack-loader.ts

@@ -58,7 +58,6 @@ export default custom<AngularCustomOptions>(() => {
         customOptions.angularLinker = {
           shouldLink: true,
           jitMode: aot !== true,
-          sourcemap: false,
         };
         shouldProcess = true;
       }
@@ -141,15 +140,6 @@ export default custom<AngularCustomOptions>(() => {
         );
       }
 
-      // Only enable linker template sourcemapping if linker is enabled and Webpack provides
-      // a sourcemap. This logic allows the linker sourcemap behavior to be controlled by the
-      // Webpack sourcemap configuration. For example, if a vendor file is being processed
-      // and vendor sourcemaps are disabled, the `inputSourceMap` property will be `undefined`
-      // which will effectively disable linker sourcemapping for vendor files.
-      if (customOptions.angularLinker && configuration.options.inputSourceMap) {
-        customOptions.angularLinker.sourcemap = true;
-      }
-
       return {
         ...configuration.options,
         // Workaround for https://github.com/babel/babel-loader/pull/896 is available