fix: update regexes to correctly account for unquoted attribute values, see sveltejs/svelte#9552

Author: dominikg

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

@@ -16,7 +16,7 @@ import { isSvelte5 } from './svelte-version.js';
 // which is closer to the other regexes in at least not falling into commented script
 // but ideally would be shared exactly with svelte and other tools that use it
 const scriptLangRE =
-	/<!--[^]*?-->|<script (?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s])\s+)*)lang=["']?([^"' >]+)["']?[^>]*>/;
+	/<!--[^]*?-->|<script (?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)\s+)*)lang=["']?([^"' >]+)["']?[^>]*>/;
 
 /**
  * @param {Function} [makeHot]

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

@@ -114,9 +114,9 @@ export function enhanceCompileError(err, originalCode, preprocessors) {
 
 	// Handle incorrect TypeScript usage
 	if (err.code === 'parse-error') {
-		// Reference from Svelte: https://github.com/sveltejs/svelte/blob/e0271f0fc7b3191ba3d5fc7982ec09d7cb0d0ac9/packages/svelte/src/compiler/preprocess/index.js#L258
+		// Reference from Svelte: https://github.com/sveltejs/svelte/blob/9926347ad9dbdd0f3324d5538e25dcb7f5e442f8/packages/svelte/src/compiler/preprocess/index.js#L259
 		const scriptRe =
-			/<!--[^]*?-->|<script((?:\s+[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s])|\s+[^=>'"/]+)*\s*)(?:\/>|>([\S\s]*?)<\/script>)/g;
+			/<!--[^]*?-->|<script((?:\s+[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/]+)*\s*)(?:\/>|>([\S\s]*?)<\/script>)/g;
 		const errIndex = err.pos ?? -1;
 
 		let m;
@@ -143,9 +143,9 @@ export function enhanceCompileError(err, originalCode, preprocessors) {
 
 	// Handle incorrect CSS preprocessor usage
 	if (err.code === 'css-syntax-error') {
-		// Reference from Svelte: https://github.com/sveltejs/svelte/blob/e0271f0fc7b3191ba3d5fc7982ec09d7cb0d0ac9/packages/svelte/src/compiler/preprocess/index.js#L256
+		// Reference from Svelte:https://github.com/sveltejs/svelte/blob/9926347ad9dbdd0f3324d5538e25dcb7f5e442f8/packages/svelte/src/compiler/preprocess/index.js#L257
 		const styleRe =
-			/<!--[^]*?-->|<style((?:\s+[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s])|\s+[^=>'"/]+)*\s*)(?:\/>|>([\S\s]*?)<\/style>)/g;
+			/<!--[^]*?-->|<style((?:\s+[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/]+)*\s*)(?:\/>|>([\S\s]*?)<\/style>)/g;
 
 		let m;
 		while ((m = styleRe.exec(originalCode))) {