fixup! refactor(@angular/build): support library compilation in AngularCompilation

Author: alan-agius4

packages/angular/build/src/tools/angular/compilation/parallel-worker.ts

@@ -125,6 +125,7 @@ export async function initialize(request: InitRequest): Promise<AngularCompilati
       // TODO: Expand? `allowJs`, `isolatedModules`, `sourceMap`, `inlineSourceMap` are the only fields needed currently.
       compilerOptions: {
         allowJs: compilerOptions.allowJs,
+        declarationMap: compilerOptions.declarationMap,
         isolatedModules: compilerOptions.isolatedModules,
         sourceMap: compilerOptions.sourceMap,
         inlineSourceMap: compilerOptions.inlineSourceMap,