refactor(@angular-devkit/build-angular): remove Webpack-specific index option helper from Vite-based dev-server

The index output option helper from within the Webpack-based build system has been removed
from the Vite-based development server code to support separation of the builder. This
information will eventually be passed via the build system results and the direct option
access can then be removed completely.

Author: clydin

packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts

@@ -23,13 +23,12 @@ import type { json } from '@angular-devkit/core';
 import type { Plugin } from 'esbuild';
 import assert from 'node:assert';
 import { readFile } from 'node:fs/promises';
-import { join } from 'node:path';
+import { basename, join } from 'node:path';
 import type { Connect, DepOptimizationConfig, InlineConfig, ViteDevServer } from 'vite';
 import { createAngularMemoryPlugin } from '../../tools/vite/angular-memory-plugin';
 import { createAngularLocaleDataPlugin } from '../../tools/vite/i18n-locale-plugin';
 import { loadProxyConfiguration, normalizeSourceMaps } from '../../utils';
 import { loadEsmModule } from '../../utils/load-esm';
-import { getIndexOutputFile } from '../../utils/webpack-browser-config';
 import { buildEsbuildBrowser } from '../browser-esbuild';
 import { Schema as BrowserBuilderOptions } from '../browser-esbuild/schema';
 import type { NormalizedDevServerOptions } from './options';
@@ -131,8 +130,13 @@ export async function* serveWithVite(
 
   // Extract output index from options
   // TODO: Provide this info from the build results
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  const htmlIndexPath = getIndexOutputFile(browserOptions.index as any);
+  let htmlIndexPath = 'index.html';
+  if (browserOptions.index && typeof browserOptions.index !== 'boolean') {
+    htmlIndexPath =
+      typeof browserOptions.index === 'string'
+        ? basename(browserOptions.index)
+        : browserOptions.index.output || 'index.html';
+  }
 
   // dynamically import Vite for ESM compatibility
   const { createServer, normalizePath } = await loadEsmModule<typeof import('vite')>('vite');