feat: Vercel adapter

.gitignore

@@ -1,5 +1,6 @@
 node_modules/
 dist/
+.output/
 *.tsbuildinfo
 .DS_Store
 .vercel

packages/integrations/vercel/README.md

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+# @astrojs/netlify
+
+Deploy your server-side rendered (SSR) Astro app to [Netlify](https://www.netlify.com/).
+
+Use this adapter in your Astro configuration file:
+
+```js
+import { defineConfig } from 'astro/config';
+import netlify from '@astrojs/netlify/functions';
+
+export default defineConfig({
+	adapter: netlify()
+});
+```
+
+After you build your site the `netlify/` folder will contain [Netlify Functions](https://docs.netlify.com/functions/overview/) in the `netlify/functions/` folder.
+
+Now you can deploy!
+
+```shell
+netlify deploy
+```
+
+## Configuration
+
+The output folder is configuration with the `dist` property when creating the adapter.
+
+```js
+import { defineConfig } from 'astro/config';
+import netlify from '@astrojs/netlify/functions';
+
+export default defineConfig({
+  adapter: netlify({
+    dist: new URL('./dist/', import.meta.url)
+  })
+});
+```
+
+And then point to the dist in your `netlify.toml`:
+
+```toml
+[functions]
+  directory = "dist/functions"
+```

packages/integrations/vercel/package.json

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+{
+  "name": "@astrojs/vercel",
+  "description": "Deploy your site to Vercel",
+  "version": "0.0.1",
+  "type": "module",
+  "types": "./dist/index.d.ts",
+  "author": "withastro",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/withastro/astro.git",
+    "directory": "packages/integrations/vercel"
+  },
+  "bugs": "https://github.com/withastro/astro/issues",
+  "homepage": "https://astro.build",
+  "exports": {
+    ".": "./dist/index.js",
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "build": "astro-scripts build \"src/**/*.ts\" && tsc",
+    "dev": "astro-scripts dev \"src/**/*.ts\""
+  },
+  "dependencies": {
+    "@astrojs/webapi": "^0.11.0",
+    "@vercel/nft": "^0.18.0",
+    "@vercel/node": "^1.14.0"
+  },
+  "devDependencies": {
+    "astro": "workspace:*",
+    "astro-scripts": "workspace:*"
+  }
+}

packages/integrations/vercel/src/index.ts

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+import type { AstroIntegration, AstroConfig } from 'astro';
+import fs from 'fs/promises';
+import type { PathLike } from 'fs';
+
+export type { VercelApiHandler, VercelRequest, VercelRequestBody, VercelRequestCookies, VercelRequestQuery, VercelResponse } from '@vercel/node';
+
+const writeJson = (path: PathLike, data: any) => fs.writeFile(path, JSON.stringify(data), { encoding: 'utf-8' });
+
+export function vercelFunctions(): AstroIntegration {
+	let _config: AstroConfig;
+	let output: URL;
+	return {
+		name: '@astrojs/vercel',
+		hooks: {
+			'astro:config:setup': ({ config }) => {
+				output = new URL('./.output/', config.projectRoot);
+				config.dist = new URL('./static/', output);
+				config.buildOptions.pageUrlFormat = 'directory';
+			},
+			'astro:config:done': async ({ config, setAdapter }) => {
+				// setAdapter(getAdapter(config.buildOptions.site));
+				_config = config;
+			},
+			'astro:build:start': async () => {
+				await fs.rm(output, { recursive: true });
+			},
+			'astro:build:done': async ({ pages }) => {
+				await Promise.all(
+					pages.map(async ({ pathname }) => {
+						const origin = new URL(`./static/${pathname}index.html`, output);
+						const finalDir = new URL(`./server/pages/${pathname}`, output);
+
+						await fs.mkdir(finalDir, { recursive: true });
+						await fs.copyFile(origin, new URL(`./index.html`, finalDir));
+						await fs.rm(origin);
+					})
+				);
+
+				// Routes Manifest
+				// https://vercel.com/docs/file-system-api#configuration/routes
+				await writeJson(new URL(`./routes-manifest.json`, output), {
+					version: 3,
+					basePath: '/',
+					pages404: false,
+				});
+			},
+		},
+	};
+}
+
+export default vercelFunctions;

packages/integrations/vercel/tsconfig.json

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+{
+  "extends": "../../../tsconfig.base.json",
+  "include": ["src"],
+  "compilerOptions": {
+    "allowJs": true,
+    "module": "ES2020",
+    "outDir": "./dist",
+    "target": "ES2020"
+  }
+}