first crack at adapter-auto

.changeset/popular-schools-guess.md

@@ -0,0 +1,6 @@
+---
+'@sveltejs/adapter-auto': patch
+'create-svelte': patch
+---
+
+Add adapter-auto

packages/adapter-auto/.gitignore

@@ -0,0 +1,2 @@
+.DS_Store
+node_modules

packages/adapter-auto/README.md

@@ -0,0 +1,13 @@
+# adapter-auto
+
+Automatically chooses the adapter for your current environment, if possible.
+
+## Supported environments
+
+- [Cloudflare Pages](https://developers.cloudflare.com/pages/) via [adapter-cloudflare](../adapter-cloudflare)
+- [Netlify](https://netlify.com/) via [adapter-netlify](../adapter-netlify)
+- [Vercel](https://vercel.com/) via [adapter-vercel](../adapter-vercel)
+
+## Changelog
+
+[The Changelog for this package is available on GitHub](https://github.com/sveltejs/kit/blob/master/packages/adapter-auto/CHANGELOG.md).

packages/adapter-auto/index.d.ts

@@ -0,0 +1,4 @@
+import { Adapter } from '@sveltejs/kit';
+
+declare function plugin(): Adapter;
+export = plugin;

packages/adapter-auto/index.js

@@ -0,0 +1,38 @@
+const adapters = [
+	{
+		test: () => !!process.env.VERCEL,
+		module: '@sveltejs/adapter-vercel'
+	},
+	{
+		test: () => !!process.env.NETLIFY,
+		module: '@sveltejs/adapter-netlify'
+	},
+	{
+		test: () => !!process.env.CF_PAGES,
+		module: '@sveltejs/adapter-cloudflare'
+	}
+];
+
+/** @type {import('.')} **/
+export default function () {
+	return {
+		name: '@sveltejs/adapter-auto',
+
+		async adapt(options) {
+			for (const candidate of adapters) {
+				if (candidate.test()) {
+					options.utils.log.info(`Detected support for ${candidate.module}`);
+
+					const module = await import(candidate.module);
+					const adapter = module.default();
+
+					return adapter.adapt(options);
+				}
+			}
+
+			options.utils.log.warn(
+				'Could not detect production environment. You may need to install an adapter. See https://kit.svelte.dev/docs#adapters for more information'
+			);
+		}
+	};
+}

packages/adapter-auto/package.json

@@ -0,0 +1,32 @@
+{
+	"name": "@sveltejs/adapter-auto",
+	"version": "1.0.0-next",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/sveltejs/kit",
+		"directory": "packages/adapter-auto"
+	},
+	"homepage": "https://kit.svelte.dev",
+	"type": "module",
+	"exports": {
+		".": {
+			"import": "./index.js"
+		},
+		"./package.json": "./package.json"
+	},
+	"main": "index.js",
+	"types": "index.d.ts",
+	"files": [
+		"files",
+		"index.d.ts"
+	],
+	"scripts": {
+		"lint": "eslint --ignore-path .gitignore \"**/*.{ts,js,svelte}\" && npm run check-format",
+		"format": "npm run check-format -- --write",
+		"check-format": "prettier --check . --config ../../.prettierrc --ignore-path .gitignore"
+	},
+	"dependencies": {
+		"@sveltejs/adapter-netlify": "workspace:*",
+		"@sveltejs/adapter-vercel": "workspace:*"
+	}
+}

packages/create-svelte/templates/default/.gitignore

@@ -4,3 +4,5 @@ node_modules
 /.svelte-kit
 /package
 .env
+.vercel
+.output

packages/create-svelte/templates/default/package.json

@@ -7,10 +7,8 @@
 		"start": "svelte-kit start"
 	},
 	"devDependencies": {
-		"@sveltejs/adapter-cloudflare-workers": "next",
-		"@sveltejs/adapter-netlify": "next",
-		"@sveltejs/adapter-vercel": "next",
-		"@sveltejs/kit": "next",
+		"@sveltejs/adapter-auto": "workspace:*",
+		"@sveltejs/kit": "workspace:*",
 		"svelte": "^3.44.0",
 		"svelte-preprocess": "^4.9.8",
 		"typescript": "^4.4.3"

packages/create-svelte/templates/default/package.template.json

@@ -7,6 +7,7 @@
 		"preview": "svelte-kit preview"
 	},
 	"devDependencies": {
+		"@sveltejs/adapter-auto": "workspace:*",
 		"@sveltejs/kit": "workspace:*",
 		"svelte": "^3.34.0"
 	},

packages/create-svelte/templates/default/svelte.config.js

@@ -1,22 +1,18 @@
+import adapter from '@sveltejs/adapter-auto';
 import preprocess from 'svelte-preprocess';
 
-const adapter = process.env.ADAPTER;
-const options = JSON.parse(process.env.OPTIONS || '{}');
-
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	// Consult https://github.com/sveltejs/svelte-preprocess
 	// for more information about preprocessors
 	preprocess: preprocess(),
 
 	kit: {
+		adapter: adapter(),
+
 		// hydrate the <div id="svelte"> element in src/app.html
 		target: '#svelte'
 	}
 };
 
-if (adapter) {
-	config.kit.adapter = (await import(adapter)).default(options);
-}
-
 export default config;

packages/create-svelte/templates/skeleton/svelte.config.js

@@ -1,12 +1,9 @@
-import node from '@sveltejs/adapter-node';
+import adapter from '@sveltejs/adapter-auto';
 
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	kit: {
-		// By default, `npm run build` will create a standard Node app.
-		// You can create optimized builds for different platforms by
-		// specifying a different adapter
-		adapter: node(),
+		adapter: adapter(),
 
 		// hydrate the <div id="svelte"> element in src/app.html
 		target: '#svelte'