simplify vercel adapter

Author: Rich-Harris

packages/adapter-vercel/.gitignore

@@ -1,3 +1,2 @@
 .DS_Store
-node_modules
-/files
+node_modules

packages/adapter-vercel/src/entry.js packages/adapter-vercel/files/entry.jspackages/adapter-vercel/src/entry.js renamed to packages/adapter-vercel/files/entry.js

@@ -0,0 +1,9 @@
+[
+	{
+		"handle": "filesystem"
+	},
+	{
+		"src": "/.*",
+		"dest": ".vercel/functions/render"
+	}
+]

packages/adapter-vercel/files/routes.json

@@ -1,55 +1,46 @@
 const { writeFileSync } = require('fs');
-const { resolve, join } = require('path');
+const { join } = require('path');
+const esbuild = require('esbuild');
 
 module.exports = function () {
 	/** @type {import('@sveltejs/kit').Adapter} */
 	const adapter = {
 		name: '@sveltejs/adapter-vercel',
 
 		async adapt(utils) {
-			const vercel_output_directory = resolve('.vercel_build_output');
-			utils.rimraf(vercel_output_directory);
+			const dir = '.vercel_build_output';
+			utils.rimraf(dir);
 
-			const config_directory = join(vercel_output_directory, 'config');
-			const static_directory = join(vercel_output_directory, 'static');
-			const lambda_directory = join(vercel_output_directory, 'functions', 'node', 'render');
+			const files = join(__dirname, 'files');
 
-			utils.copy(join(__dirname, 'src/entry.js'), '.svelte/vercel/entry.js');
+			const dirs = {
+				static: join(dir, 'static'),
+				lambda: join(dir, 'functions/node/render')
+			};
 
-			const esbuild = (await import('esbuild')).default;
+			utils.log.minor('Generating serverless function...');
+			utils.copy(join(files, 'entry.js'), '.svelte/vercel/entry.js');
 
 			await esbuild.build({
 				entryPoints: ['.svelte/vercel/entry.js'],
-				outfile: join(lambda_directory, 'index.js'),
+				outfile: join(dirs.lambda, 'index.js'),
 				bundle: true,
 				platform: 'node'
 			});
 
-			writeFileSync(join(lambda_directory, 'package.json'), JSON.stringify({ type: 'commonjs' }));
-
-			utils.log.minor('Writing client application...');
-			utils.copy_static_files(static_directory);
-			utils.copy_client_files(static_directory);
+			writeFileSync(join(dirs.lambda, 'package.json'), JSON.stringify({ type: 'commonjs' }));
 
 			utils.log.minor('Prerendering static pages...');
 			await utils.prerender({
-				dest: static_directory
+				dest: dirs.static
 			});
 
+			utils.log.minor('Copying assets...');
+			utils.copy_static_files(dirs.static);
+			utils.copy_client_files(dirs.static);
+
 			utils.log.minor('Writing routes...');
-			utils.mkdirp(config_directory);
-			writeFileSync(
-				join(config_directory, 'routes.json'),
-				JSON.stringify([
-					{
-						handle: 'filesystem'
-					},
-					{
-						src: '/.*',
-						dest: '.vercel/functions/render'
-					}
-				])
-			);
+			utils.copy(join(files, 'routes.json'), join(dir, 'config/routes.json'));
 		}
 	};
 

packages/adapter-vercel/index.js

@@ -6,18 +6,13 @@
 		"files"
 	],
 	"scripts": {
-		"dev": "rollup -cw",
-		"build": "rollup -c",
 		"lint": "eslint --ignore-path .gitignore \"**/*.{ts,js,svelte}\" && npm run check-format",
 		"format": "prettier --write . --config ../../.prettierrc --ignore-path .gitignore",
-		"check-format": "prettier --check . --config ../../.prettierrc --ignore-path .gitignore",
-		"prepublishOnly": "npm run build"
+		"check-format": "prettier --check . --config ../../.prettierrc --ignore-path .gitignore"
 	},
 	"devDependencies": {
 		"@sveltejs/kit": "workspace:*",
 		"esbuild": "^0.11.12",
-		"rollup": "^2.41.1",
-		"sirv": "^1.0.11",
 		"typescript": "^4.2.3"
 	}
 }

packages/adapter-vercel/package.json

@@ -3,7 +3,7 @@
 	"version": "0.0.1",
 	"scripts": {
 		"dev": "svelte-kit dev",
-		"build": "svelte-kit build",
+		"build": "svelte-kit build --verbose",
 		"start": "svelte-kit start"
 	},
 	"devDependencies": {