add a new flag with --open for the dev and the preview

.changeset/hip-avocados-grow.md

@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+add new flag with open for dev and preview

packages/astro/src/@types/astro.ts

@@ -88,6 +88,7 @@ export interface CLIFlags {
 	port?: number;
 	config?: string;
 	drafts?: boolean;
+	open?: boolean;
 	experimentalAssets?: boolean;
 }
 

packages/astro/src/core/config/config.ts

@@ -96,6 +96,7 @@ export function resolveFlags(flags: Partial<Flags>): CLIFlags {
 		site: typeof flags.site === 'string' ? flags.site : undefined,
 		base: typeof flags.base === 'string' ? flags.base : undefined,
 		port: typeof flags.port === 'number' ? flags.port : undefined,
+		open: typeof flags.open === 'boolean' ? flags.open : undefined,
 		config: typeof flags.config === 'string' ? flags.config : undefined,
 		host:
 			typeof flags.host === 'string' || typeof flags.host === 'boolean' ? flags.host : undefined,
@@ -130,6 +131,11 @@ function mergeCLIFlags(astroConfig: AstroUserConfig, flags: CLIFlags) {
 		// TODO: Come back here and refactor to remove this expected error.
 		astroConfig.server.host = flags.host;
 	}
+	if (typeof flags.open === 'boolean') {
+		// @ts-expect-error astroConfig.server may be a function, but TS doesn't like attaching properties to a function.
+		// TODO: Come back here and refactor to remove this expected error.
+		astroConfig.server.open = flags.open;
+	}
 	return astroConfig;
 }
 

packages/astro/src/core/config/schema.ts

@@ -26,6 +26,7 @@ const ASTRO_CONFIG_DEFAULTS: AstroUserConfig & any = {
 		host: false,
 		port: 3000,
 		streaming: true,
+		open: false,
 	},
 	integrations: [],
 	markdown: {
@@ -108,6 +109,7 @@ export const AstroConfigSchema = z.object({
 		// validate
 		z
 			.object({
+				open: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.server.open),
 				host: z
 					.union([z.string(), z.boolean()])
 					.optional()
@@ -246,6 +248,7 @@ export function createRelativeSchema(cmd: string, fileProtocolRoot: URL) {
 						.optional()
 						.default(ASTRO_CONFIG_DEFAULTS.server.host),
 					port: z.number().optional().default(ASTRO_CONFIG_DEFAULTS.server.port),
+					open: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.server.open),
 					headers: z.custom<OutgoingHttpHeaders>().optional(),
 					streaming: z.boolean().optional().default(true),
 				})

packages/astro/src/core/dev/container.ts

@@ -71,7 +71,7 @@ export async function createContainer(params: CreateContainerParams = {}): Promi
 		logging,
 		isRestart,
 	});
-	const { host, headers } = settings.config.server;
+	const { host, headers, open } = settings.config.server;
 
 	// The client entrypoint for renderers. Since these are imported dynamically
 	// we need to tell Vite to preoptimize them.
@@ -82,7 +82,7 @@ export async function createContainer(params: CreateContainerParams = {}): Promi
 	const viteConfig = await createVite(
 		{
 			mode: 'development',
-			server: { host, headers },
+			server: { host, headers, open },
 			optimizeDeps: {
 				include: rendererClientEntries,
 			},

packages/astro/src/core/dev/dev.ts

@@ -45,6 +45,7 @@ export default async function dev(
 					['--host', `Listen on all addresses, including LAN and public addresses.`],
 					['--host <custom-address>', `Expose on a network IP address at <custom-address>`],
 					['--help (-h)', 'See all available flags.'],
+					['--open (-h)', 'automatically open the app in the browser on server start'],
 				],
 			},
 			description: `Check ${cyan(

packages/astro/src/core/preview/index.ts

@@ -26,7 +26,10 @@ export default async function preview(
 			commandName: 'astro preview',
 			usage: '[...flags]',
 			tables: {
-				Flags: [['--help (-h)', 'See all available flags.']],
+				Flags: [
+					['--help (-h)', 'See all available flags.'],
+					['--open (-h)', 'automatically open the app in the browser on server start'],
+				],
 			},
 			description: `Starts a local server to serve your static dist/ directory. Check ${cyan(
 				'https://docs.astro.build/en/reference/cli-reference/#astro-preview'

packages/astro/src/core/preview/static-preview-server.ts

@@ -37,6 +37,7 @@ export default async function createStaticPreviewServer(
 				host: settings.config.server.host,
 				port: settings.config.server.port,
 				headers: settings.config.server.headers,
+				open: settings.config.server.open,
 			},
 			plugins: [vitePluginAstroPreview(settings)],
 		});