remove ENABLE_VC_BUILD checks, use v3 build output API for all vercel…

… apps (#5514)

.changeset/warm-knives-swim.md

@@ -0,0 +1,6 @@
+---
+'@sveltejs/adapter-static': patch
+'@sveltejs/adapter-vercel': patch
+---
+
+Remove ENABLE_VC_BUILD check, use v3 build output API for all apps deployed to Vercel

packages/adapter-static/platforms.js

@@ -63,10 +63,8 @@ function vercel_routes(builder) {
 /** @type {Platform[]} */
 export const platforms = [
 	{
-		// Build Output API
-		// TODO remove the ENABLE_VC_BUILD check when no longer required
 		name: 'Vercel',
-		test: () => !!process.env.VERCEL && !!process.env.ENABLE_VC_BUILD,
+		test: () => !!process.env.VERCEL,
 		defaults: (config) => ({
 			pages: `.vercel/output/static/${config.kit.appDir}/prerendered`,
 			assets: '.vercel/output/static'
@@ -80,25 +78,5 @@ export const platforms = [
 				})
 			);
 		}
-	},
-	{
-		// Legacy filesystem API
-		// TODO remove once Build Output API leaves beta
-		name: 'Vercel',
-		test: () => !!process.env.VERCEL,
-		defaults: (config) => ({
-			pages: `.vercel_build_output/static/${config.kit.appDir}/prerendered`,
-			assets: '.vercel_build_output/static'
-		}),
-		done: (builder) => {
-			if (!fs.existsSync('.vercel_build_output/config')) {
-				fs.mkdirSync('.vercel_build_output/config');
-			}
-
-			fs.writeFileSync(
-				'.vercel_build_output/config/routes.json',
-				JSON.stringify(vercel_routes(builder))
-			);
-		}
 	}
 ];

packages/adapter-vercel/README.md

@@ -6,8 +6,6 @@ If you're using [adapter-auto](../adapter-auto), you don't need to install this
 
 ## Usage
 
-> The `edge` and `split` options depend on the Vercel Build Output API which is currently in beta. For now, you must opt in by visiting `https://vercel.com/[YOUR_USERNAME]/[YOUR_PROJECT]/settings/environment-variables` and adding `ENABLE_VC_BUILD` with the value `1`.
-
 Add `"@sveltejs/adapter-vercel": "next"` to the `devDependencies` in your `package.json` and run `npm install`.
 
 Then in your `svelte.config.js`: