feat(angular-rspack): support index transformer

packages/angular-rspack/src/lib/models/angular-rspack-plugin-options.ts

@@ -157,13 +157,11 @@ export type IndexExpandedDefinition = {
   input: string;
   output?: string;
   preloadInitial?: boolean;
+  transformer?: IndexHtmlTransform;
 };
 export type IndexElement = IndexExpandedDefinition | string | false;
 export type IndexHtmlTransform = (content: string) => Promise<string>;
-export type NormalizedIndexElement =
-  | IndexExpandedDefinition & {
-      transformer: IndexHtmlTransform | undefined;
-    };
+export type NormalizedIndexElement = IndexExpandedDefinition;
 
 export type NormalizedEntryPoint = Required<
   Exclude<ScriptOrStyleEntry, string>

packages/angular-rspack/src/lib/models/normalize-options.ts

@@ -201,8 +201,8 @@ export async function normalizeOptions(
       typeof options.index === 'string' ? options.index : options.index.input
     ),
     output: indexOutput,
-    // @TODO: Add support for transformer
-    transformer: undefined,
+    transformer:
+      typeof options.index === 'object' ? options.index.transformer : undefined,
     // Preload initial defaults to true
     preloadInitial:
       typeof options.index !== 'object' ||

packages/angular-rspack/src/lib/plugins/ng-rspack.ts

@@ -132,6 +132,7 @@ export class NgRspackPlugin implements RspackPluginInstance {
         ),
         i18n: this.i18n,
         optimization: this.pluginOptions.optimization,
+        postTransform: this.pluginOptions.index.transformer,
         isSsr: !!(
           this.pluginOptions.ssr ||
           this.pluginOptions.prerender ||