feat: enable vercel image optimization

.changeset/flat-clocks-listen.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': minor
+---
+
+feat: expose vercel image optimization config in adapter config

packages/adapter-vercel/index.d.ts

@@ -4,6 +4,30 @@ type Options = {
 	edge?: boolean;
 	external?: string[];
 	split?: boolean;
+	platform?: VercelConfig;
+};
+
+type ImageFormat = 'image/avif' | 'image/webp';
+
+type RemotePattern = {
+	protocol?: 'http' | 'https';
+	hostname: string;
+	port?: string;
+	pathname?: string;
+};
+
+type ImagesConfig = {
+	sizes: number[];
+	domains: string[];
+	remotePatterns?: RemotePattern[];
+	minimumCacheTTL?: number; // seconds
+	formats?: ImageFormat[];
+	dangerouslyAllowSVG?: boolean;
+	contentSecurityPolicy?: string;
+};
+
+type VercelConfig = {
+	images: ImagesConfig;
 };
 
 export default function plugin(options?: Options): Adapter;

packages/adapter-vercel/index.js

@@ -5,7 +5,7 @@ import { nodeFileTrace } from '@vercel/nft';
 import esbuild from 'esbuild';
 
 /** @type {import('.').default} **/
-const plugin = function ({ external = [], edge, split } = {}) {
+const plugin = function ({ external = [], edge, split, platform = {} } = {}) {
 	return {
 		name: '@sveltejs/adapter-vercel',
 
@@ -134,6 +134,10 @@ const plugin = function ({ external = [], edge, split } = {}) {
 				await generate_function('render', '/.*', builder.generateManifest);
 			}
 
+			if (platform && platform?.images) {
+				config.images = platform.images;
+			}
+
 			builder.log.minor('Copying assets...');
 
 			builder.writeClient(dirs.static);
@@ -182,6 +186,9 @@ function static_vercel_config(builder) {
 	/** @type {Record<string, { path: string }>} */
 	const overrides = {};
 
+	/** @type {import('./index').ImagesConfig} */
+	const images = undefined;
+
 	for (const [src, redirect] of builder.prerendered.redirects) {
 		prerendered_redirects.push({
 			src,
@@ -219,7 +226,8 @@ function static_vercel_config(builder) {
 				handle: 'filesystem'
 			}
 		],
-		overrides
+		overrides,
+		images
 	};
 }