fix(@angular/build): disable strictPort when port 0 is used in dev-server

When port 0 is specified, an ephemeral port is selected. Previously, strictPort was hardcoded to true, which caused Vite to fail immediately if the ephemeral port was occupied during rebuilds or rapid restarts. strictPort is now set to false when port 0 is requested, allowing Vite to fall back to an available port.

Author: alan-agius4

packages/angular/build/src/builders/dev-server/options.ts

@@ -13,7 +13,12 @@ import { normalizeCacheOptions } from '../../utils/normalize-cache';
 import { ApplicationBuilderOptions } from '../application';
 import { Schema as DevServerOptions } from './schema';
 
-export type NormalizedDevServerOptions = Awaited<ReturnType<typeof normalizeOptions>>;
+export type NormalizedDevServerOptions = Omit<
+  Awaited<ReturnType<typeof normalizeOptions>>,
+  'strictPort'
+> & {
+  strictPort?: boolean;
+};
 
 /**
  * Normalize the user provided options by creating full paths for all path based options
@@ -122,6 +127,7 @@ export async function normalizeOptions(
     buildTarget,
     host: host ?? 'localhost',
     port,
+    strictPort: port !== 0,
     poll,
     open,
     verbose,

packages/angular/build/src/builders/dev-server/vite/server.ts

@@ -56,7 +56,7 @@ async function createServerConfig(
       ssrFiles,
     },
     port: serverOptions.port,
-    strictPort: true,
+    strictPort: serverOptions.strictPort ?? true,
     host: serverOptions.host,
     open: serverOptions.open,
     allowedHosts: serverOptions.allowedHosts,