Unflag View Transition support (#8218)

* Unflag View Transition support

* Add a changeset

* Update .changeset/grumpy-pens-melt.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

---------

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

.changeset/grumpy-pens-melt.md

@@ -0,0 +1,21 @@
+---
+'astro': minor
+---
+
+View Transitions unflagged
+
+View Transition support in Astro is now unflagged. For those who have used the experimental feature you can remove the flag in your Astro config:
+
+```diff
+import { defineConfig } from 'astro'
+
+export default defineConfig({
+-  experimental: {
+-    viewTransitions: true,
+-  }
+})
+```
+
+After removing this flag, please also consult the specific [upgrade to v3.0 advice](https://docs.astro.build/en/guides/view-transitions/#upgrade-to-v30-from-v2x) as some API features have changed and you may have breaking changes with your existing view transitions.
+
+See the [View Transitions guide](https://docs.astro.build/en/guides/view-transitions/) to learn how to use the API.

packages/astro/e2e/fixtures/view-transitions/astro.config.mjs

@@ -7,9 +7,6 @@ export default defineConfig({
 	output: 'server',
 	adapter: nodejs({ mode: 'standalone' }),
 	integrations: [react()],
-	experimental: {
-		viewTransitions: true,
-	},
 	vite: {
 		build: {
 			assetsInlineLimit: 0,

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

@@ -1282,27 +1282,6 @@ export interface AstroUserConfig {
 	 * These flags are not guaranteed to be stable.
 	 */
 	experimental?: {
-		/**
-		 * @docs
-		 * @name experimental.viewTransitions
-		 * @type {boolean}
-		 * @default `false`
-		 * @version 2.9.0
-		 * @description
-		 * Enable experimental support for the `<ViewTransitions / >` component. With this enabled
-		 * you can opt-in to [view transitions](https://docs.astro.build/en/guides/view-transitions/) on a per-page basis using this component
-		 * and enable animations with the `transition:animate` directive.
-		 *
-		 * ```js
-		 * {
-		 * 	experimental: {
-		 *		viewTransitions: true,
-		 * 	},
-		 * }
-		 * ```
-		 */
-		viewTransitions?: boolean;
-
 		/**
 		 * @docs
 		 * @name experimental.optimizeHoistedScript

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

@@ -44,7 +44,6 @@ const ASTRO_CONFIG_DEFAULTS = {
 	legacy: {},
 	redirects: {},
 	experimental: {
-		viewTransitions: false,
 		optimizeHoistedScript: false,
 	},
 } satisfies AstroUserConfig & { server: { open: boolean } };
@@ -264,10 +263,6 @@ export const AstroConfigSchema = z.object({
 		.default(ASTRO_CONFIG_DEFAULTS.vite),
 	experimental: z
 		.object({
-			viewTransitions: z
-				.boolean()
-				.optional()
-				.default(ASTRO_CONFIG_DEFAULTS.experimental.viewTransitions),
 			optimizeHoistedScript: z
 				.boolean()
 				.optional()

packages/astro/src/core/create-vite.ts

@@ -133,7 +133,7 @@ export async function createVite(
 			astroContentAssetPropagationPlugin({ mode, settings }),
 			vitePluginSSRManifest(),
 			astroAssetsPlugin({ settings, logger, mode }),
-			astroTransitions({ config: settings.config }),
+			astroTransitions(),
 		],
 		publicDir: fileURLToPath(settings.config.publicDir),
 		root: fileURLToPath(settings.config.root),

packages/astro/src/transitions/vite-plugin-transitions.ts

@@ -1,12 +1,10 @@
 import * as vite from 'vite';
-import type { AstroConfig } from '../@types/astro';
-import { AstroError } from '../core/errors/index.js';
 
 const virtualModuleId = 'astro:transitions';
 const resolvedVirtualModuleId = '\0' + virtualModuleId;
 
 // The virtual module for the astro:transitions namespace
-export default function astroTransitions({ config }: { config: AstroConfig }): vite.Plugin {
+export default function astroTransitions(): vite.Plugin {
 	return {
 		name: 'astro:transitions',
 		async resolveId(id) {
@@ -16,20 +14,6 @@ export default function astroTransitions({ config }: { config: AstroConfig }): v
 		},
 		load(id) {
 			if (id === resolvedVirtualModuleId) {
-				if (!config.experimental.viewTransitions) {
-					throw new AstroError({
-						name: 'TransitionError',
-						title: 'Experimental View Transitions not enabled',
-						message: `View Transitions support is experimental. To enable update your config to include: 
-						
-export default defineConfig({
-	experimental: {
-		viewTransitions: true
-	}
-})`,
-					});
-				}
-
 				return `
 				export * from "astro/transitions";
 				export { default as ViewTransitions } from "astro/components/ViewTransitions.astro";