diff --git a/packages/language-server/src/lib/documents/configLoader.ts b/packages/language-server/src/lib/documents/configLoader.ts
index 49413a6f8..e65098466 100644
--- a/packages/language-server/src/lib/documents/configLoader.ts
+++ b/packages/language-server/src/lib/documents/configLoader.ts
@@ -47,10 +47,10 @@ const _dynamicImport = new Function('modulePath', 'return import(modulePath)') a
     modulePath: URL
 ) => Promise<any>;
 
-const configRegex = /\/svelte\.config\.(js|cjs|mjs)$/;
+const configRegex = /\/svelte\.config\.(js|ts|cjs|mjs|mts)$/;
 
 /**
- * Loads svelte.config.{js,cjs,mjs} files. Provides both a synchronous and asynchronous
+ * Loads svelte.config.{js,ts,cjs,mjs,mts} files. Provides both a synchronous and asynchronous
  * interface to get a config file because snapshots need access to it synchronously.
  * This means that another instance (the ts service host on startup) should make
  * sure that all config files are loaded before snapshots are retrieved.
@@ -143,7 +143,11 @@ export class ConfigLoader {
                 return this.fs.existsSync(path) ? path : undefined;
             };
             const configPath =
-                tryFindConfigPath('js') || tryFindConfigPath('cjs') || tryFindConfigPath('mjs');
+                tryFindConfigPath('js') ||
+                tryFindConfigPath('ts') ||
+                tryFindConfigPath('cjs') ||
+                tryFindConfigPath('mjs') ||
+                tryFindConfigPath('mts');
             if (configPath) {
                 return configPath;
             }
diff --git a/packages/svelte-vscode/src/extension.ts b/packages/svelte-vscode/src/extension.ts
index dae135bf8..8653a4e66 100644
--- a/packages/svelte-vscode/src/extension.ts
+++ b/packages/svelte-vscode/src/extension.ts
@@ -33,7 +33,11 @@ import { addFindComponentReferencesListener } from './typescript/findComponentRe
 import { addFindFileReferencesListener } from './typescript/findFileReferences';
 import { setupSvelteKit } from './sveltekit';
 import { resolveCodeLensMiddleware } from './middlewares';
-
+import { versions } from 'node:process';
+const [node_major, node_minor] = (versions?.node ?? '0.0.0-unknown').split('.', 3).map(Number);
+const add_experimental_strip_types_flag =
+    (node_major === 22 && node_minor > 5) || // added behind flag in 22.6.0
+    (node_major === 23 && node_minor < 6); // unflagged in 23.6
 namespace TagCloseRequest {
     export const type: RequestType<TextDocumentPositionParams, string, any> = new RequestType(
         'html/tag'
@@ -123,7 +127,9 @@ export function activateSvelteLanguageServer(context: ExtensionContext) {
     // Add --experimental-modules flag for people using node 12 < version < 12.17
     // Remove this in mid 2022 and bump vs code minimum required version to 1.55
     const runExecArgv: string[] = ['--experimental-modules'];
-
+    if (add_experimental_strip_types_flag) {
+        runExecArgv.push('--experimental-strip-types');
+    }
     const runtimeArgs = runtimeConfig.get<string[]>('runtime-args');
     if (runtimeArgs !== undefined) {
         runExecArgv.push(...runtimeArgs);