fix: generate list of svelte exports to optimize and dedupe

.changeset/sweet-pianos-sit.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+fix: dynamically generate list of svelte exports to optimize and dedupe

packages/e2e-tests/kit-node/__tests__/kit.spec.ts

@@ -328,7 +328,6 @@ describe('kit-node', () => {
 					'svelte/easing',
 					'svelte/internal',
 					'svelte/motion',
-					'svelte/ssr',
 					'svelte/store',
 					'svelte/transition',
 					'svelte',

packages/vite-plugin-svelte/src/utils/constants.js

@@ -1,31 +1,30 @@
-import { isSvelte5 } from './svelte-version.js';
+import { isSvelte4 } from './svelte-version.js';
+import { createRequire } from 'node:module';
 
 export const VITE_RESOLVE_MAIN_FIELDS = ['browser', 'module', 'jsnext:main', 'jsnext'];
 
 export const SVELTE_RESOLVE_MAIN_FIELDS = ['svelte'];
 
-export const SVELTE_IMPORTS = [
-	'svelte/animate',
-	'svelte/easing',
-	'svelte/internal',
-	'svelte/internal/disclose-version',
-	'svelte/motion',
-	'svelte/ssr',
-	'svelte/store',
-	'svelte/transition',
-	'svelte'
-];
+export const SVELTE_IMPORTS = Object.entries(
+	createRequire(import.meta.url)('svelte/package.json').exports
+)
+	.map(([name, config]) => {
+		// ignore type only
+		if (typeof config === 'object' && Object.keys(config).length === 1 && config.types) {
+			return '';
+		}
+		// ignore names
+		if (name === './package.json' || name === './compiler') {
+			return '';
+		}
+		return name.replace(/^\./, 'svelte');
+	})
+	.filter((s) => s.length > 0);
 
-export const SVELTE_HMR_IMPORTS = [
-	'svelte-hmr/runtime/hot-api-esm.js',
-	'svelte-hmr/runtime/proxy-adapter-dom.js',
-	'svelte-hmr'
-];
-
-if (isSvelte5) {
-	SVELTE_IMPORTS.push('svelte/server', 'svelte/internal/server', 'svelte/legacy');
-	SVELTE_HMR_IMPORTS.length = 0; // truncate, svelte-hmr isn't used with svelte5
-}
+// svelte-hmr isn't used with svelte5
+export const SVELTE_HMR_IMPORTS = isSvelte4
+	? ['svelte-hmr/runtime/hot-api-esm.js', 'svelte-hmr/runtime/proxy-adapter-dom.js', 'svelte-hmr']
+	: [];
 
 export const SVELTE_EXPORT_CONDITIONS = ['svelte'];
 

packages/vite-plugin-svelte/src/utils/options.js

@@ -26,7 +26,7 @@ import {
 import { isCommonDepWithoutSvelteField } from './dependencies.js';
 import { VitePluginSvelteStats } from './vite-plugin-svelte-stats.js';
 import { VitePluginSvelteCache } from './vite-plugin-svelte-cache.js';
-import { isSvelte5 } from './svelte-version.js';
+import { isSvelte4, isSvelte5 } from './svelte-version.js';
 
 const allowedPluginOptions = new Set([
 	'include',
@@ -581,7 +581,9 @@ function buildExtraConfigForSvelte(config) {
 	const include = [];
 	const exclude = ['svelte-hmr'];
 	if (!isDepExcluded('svelte', config.optimizeDeps?.exclude ?? [])) {
-		const svelteImportsToInclude = SVELTE_IMPORTS.filter((x) => x !== 'svelte/ssr'); // not used on clientside
+		const svelteImportsToInclude = SVELTE_IMPORTS.filter(
+			(x) => isSvelte4 || !x.endsWith('/server')
+		); // not used on clientside
 		log.debug(
 			`adding bare svelte packages to optimizeDeps.include: ${svelteImportsToInclude.join(', ')} `,
 			undefined,
@@ -600,7 +602,6 @@ function buildExtraConfigForSvelte(config) {
 	/** @type {string[]} */
 	const external = [];
 	// add svelte to ssr.noExternal unless it is present in ssr.external
-	// so we can resolve it with svelte/ssr
 	if (!isDepExternaled('svelte', config.ssr?.external ?? [])) {
 		noExternal.push('svelte', /^svelte\//);
 	}