Convert build to Vite plugin and expose as `@sveltejs/kit/experimenta…

…l/vite` (#5094)

* Expose Vite plugin as @sveltejs/kit/vite

* make svelte config optional

* Implement build

* export as experimental/vite for now

* add plugin correct number of times with or without vite.config.js

* add TODO

* don't rename dev file for now

* update API

* cleanup

* Update packages/kit/src/vite/plugin.js

Co-authored-by: Rich Harris <richard.a.harris@gmail.com>

* Revert "Update packages/kit/src/vite/plugin.js"

This reverts commit 4d60028.

* enable validation plugin

* enable validation for real this time

* add validation plugin to all builds

* format

* fix plugin handling

* format

* cleanup API

* remove configFile: false

* fix validation plugin

* fix preview

* Update healthy-carrots-cross.md

* move dev/build/preview inside vite plugin

* move adapt inside build

* move all vite-related code into src/vite

* move some more stuff around

* fix some stuff

* simplify stuff

* remove unused plugins_internal

* we can now simplify stuff a bunch

* simplify

* lint

* update path in .prettierrc

* revert accidental change

* try fixing CI

* try fixing CI

* lint

* lint

* fix

* appease typescript. not sure why this started happening

* whyyy

* simplify

* simplify

* simplify

* respect user config in build

* update turbo cache

* format

* resolveJsonModule

* remove unnecessary configResolved hook

* remove unused option

* minor simplification

* simplify

* move some stuff closer to where its used

* dry some stuff out, move some stuff to buildStart

* do all config checking up-front

* remove unused print_config_conflicts

* remove unused import

* simplify merging

* remove unused import

* remove blank line

* i think these files were committed by mistake

* set env vars earlier

Co-authored-by: Rich Harris <richard.a.harris@gmail.com>
Co-authored-by: Rich Harris <hello@rich-harris.dev>

.changeset/healthy-carrots-cross.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Expose Vite plugin as @sveltejs/kit/experimental/vite

.prettierrc

@@ -24,7 +24,7 @@
 				"packages/kit/src/packaging/test/fixtures/**/expected/**/*",
 				"packages/kit/src/packaging/test/watch/expected/**/*",
 				"packages/kit/src/packaging/test/watch/package/**/*",
-				"packages/kit/src/core/build/prerender/fixtures/**/*"
+				"packages/kit/src/vite/build/prerender/fixtures/**/*"
 			],
 			"options": {
 				"requirePragma": true

packages/kit/.gitignore

@@ -5,7 +5,7 @@
 /docs
 /test/**/.svelte-kit
 /test/**/build
-!/src/core/adapt/fixtures/*/.svelte-kit
+!/src/vite/build/adapt/fixtures/*/.svelte-kit
 !/test/node_modules
 /test/apps/basics/test/errors.json
 .custom-out-dir

packages/kit/package.json

@@ -88,6 +88,9 @@
 		},
 		"./hooks": {
 			"import": "./dist/hooks.js"
+		},
+		"./experimental/vite": {
+			"import": "./dist/vite.js"
 		}
 	},
 	"types": "types/index.d.ts",

packages/kit/rollup.config.js

@@ -63,7 +63,8 @@ export default [
 			cli: 'src/cli.js',
 			node: 'src/node/index.js',
 			'node/polyfills': 'src/node/polyfills.js',
-			hooks: 'src/hooks.js'
+			hooks: 'src/hooks.js',
+			vite: 'src/vite/index.js'
 		},
 		output: {
 			dir: 'dist',

packages/kit/src/cli.js

@@ -1,13 +1,12 @@
 import chokidar from 'chokidar';
 import fs from 'fs';
+import path from 'path';
 import colors from 'kleur';
-import { relative } from 'path';
 import sade from 'sade';
 import * as vite from 'vite';
 import { load_config } from './core/config/index.js';
 import { networkInterfaces, release } from 'os';
 import { coalesce_to_error } from './utils/error.js';
-import { logger } from './core/utils.js';
 
 /** @param {unknown} e */
 function handle_error(e) {
@@ -62,15 +61,8 @@ prog
 		let close;
 
 		async function start() {
-			const { plugins } = await import('./core/dev/plugin.js');
 			const svelte_config = await load_config();
-			const vite_config = await svelte_config.kit.vite();
-
-			/** @type {import('vite').UserConfig} */
-			const config = {
-				...vite_config,
-				plugins: [...(vite_config.plugins || []), plugins(svelte_config)]
-			};
+			const config = await get_vite_config(svelte_config);
 			config.server = config.server || {};
 
 			// optional config from command-line flags
@@ -81,7 +73,7 @@ prog
 
 			// if https is already enabled then do nothing. it could be an object and we
 			// don't want to overwrite with a boolean
-			if (https && !vite_config?.server?.https) {
+			if (https && !config?.server?.https) {
 				config.server.https = https;
 			}
 
@@ -158,31 +150,11 @@ prog
 	.action(async ({ verbose }) => {
 		try {
 			process.env.NODE_ENV = process.env.NODE_ENV || 'production';
-			const config = await load_config();
-
-			const log = logger({ verbose });
-
-			const { build } = await import('./core/build/index.js');
-			const { build_data, prerendered } = await build(config, { log });
-
-			console.log(
-				`\nRun ${colors.bold().cyan('npm run preview')} to preview your production build locally.`
-			);
-
-			if (config.kit.adapter) {
-				const { adapt } = await import('./core/adapt/index.js');
-				await adapt(config, build_data, prerendered, { log });
+			process.env.VERBOSE = verbose;
 
-				// this is necessary to close any open db connections, etc
-				process.exit(0);
-			}
-
-			console.log(colors.bold().yellow('\nNo adapter specified'));
-
-			// prettier-ignore
-			console.log(
-				`See ${colors.bold().cyan('https://kit.svelte.dev/docs/adapters')} to learn how to configure your app to run on the platform of your choosing`
-			);
+			const svelte_config = await load_config();
+			const vite_config = await get_vite_config(svelte_config);
+			await vite.build(vite_config); // TODO when we get rid of config.kit.vite, this can just be vite.build()
 		} catch (error) {
 			handle_error(error);
 		}
@@ -202,30 +174,18 @@ prog
 
 			process.env.NODE_ENV = process.env.NODE_ENV || 'production';
 
-			const { sveltekit_plugin } = await import('./core/preview/index.js');
 			const svelte_config = await load_config();
-			const vite_config = await svelte_config.kit.vite();
+			const vite_config = await get_vite_config(svelte_config);
 
-			/** @type {import('vite').UserConfig} */
-			const config = {
-				...vite_config,
-				plugins: [...(vite_config.plugins || []), sveltekit_plugin]
-			};
-			config.preview = config.preview || {};
+			vite_config.preview = vite_config.preview || {};
 
 			// optional config from command-line flags
 			// these should take precedence, but not print conflict warnings
-			if (host) {
-				config.preview.host = host;
-			}
-			if (https) {
-				config.preview.https = https;
-			}
-			if (port) {
-				config.preview.port = port;
-			}
+			if (host) vite_config.preview.host = host;
+			if (https) vite_config.preview.https = https;
+			if (port) vite_config.preview.port = port;
 
-			const preview_server = await vite.preview(config);
+			const preview_server = await vite.preview(vite_config);
 
 			welcome({ port, host, https, open, base: preview_server.config.base });
 		} catch (error) {
@@ -305,7 +265,7 @@ function welcome({ port, host, https, open, base, loose, allow, cwd }) {
 					if (loose) {
 						console.log(`\n  ${colors.yellow('Serving with vite.server.fs.strict: false. Note that all files on your machine will be accessible to anyone on your network.')}`);
 					} else if (allow?.length && cwd) {
-						console.log(`\n  ${colors.yellow('Note that all files in the following directories will be accessible to anyone on your network: ' + allow.map(a => relative(cwd, a)).join(', '))}`);
+						console.log(`\n  ${colors.yellow('Note that all files in the following directories will be accessible to anyone on your network: ' + allow.map(a => path.relative(cwd, a)).join(', '))}`);
 					}
 				} else {
 					console.log(`  ${colors.gray('network: not exposed')}`);
@@ -320,3 +280,27 @@ function welcome({ port, host, https, open, base, loose, allow, cwd }) {
 
 	console.log('\n');
 }
+
+/**
+ * @param {import('types').ValidatedConfig} svelte_config
+ * @return {Promise<import('vite').UserConfig>}
+ */
+export async function get_vite_config(svelte_config) {
+	for (const file of ['vite.config.js', 'vite.config.mjs', 'vite.config.cjs']) {
+		if (fs.existsSync(file)) {
+			// TODO warn here if config.kit.vite was specified
+			const module = await import(path.resolve(file));
+			return {
+				...module.default,
+				configFile: false
+			};
+		}
+	}
+
+	const { sveltekit } = await import('./vite/index.js');
+
+	// TODO: stop reading Vite config from SvelteKit config or move to CLI
+	const vite_config = await svelte_config.kit.vite();
+	vite_config.plugins = [...(vite_config.plugins || []), ...sveltekit()];
+	return vite_config;
+}