diff --git a/packages/typescript/lib/quickstart/runTsc.ts b/packages/typescript/lib/quickstart/runTsc.ts
index 02f32fd6..6b0b4ad4 100644
--- a/packages/typescript/lib/quickstart/runTsc.ts
+++ b/packages/typescript/lib/quickstart/runTsc.ts
@@ -4,17 +4,13 @@ import type { LanguagePlugin } from '@volar/language-core';
 
 export let getLanguagePlugins: (ts: typeof import('typescript'), options: ts.CreateProgramOptions) => LanguagePlugin[] = () => [];
 
-export let getLanguageId: (fileName: string) => string = () => 'ts';
-
 export function runTsc(
 	tscPath: string,
 	extensions: string[],
 	_getLanguagePlugins: typeof getLanguagePlugins,
-	_getLanguageId: typeof getLanguageId,
 ) {
 
 	getLanguagePlugins = _getLanguagePlugins;
-	getLanguageId = _getLanguageId;
 
 	const proxyApiPath = require.resolve('../node/proxyCreateProgram');
 	const readFileSync = fs.readFileSync;
@@ -36,7 +32,6 @@ export function runTsc(
 					`new Proxy({}, { get(_target, p, _receiver) { return eval(p); } } )`,
 					`_createProgram`,
 					`require(${JSON.stringify(__filename)}).getLanguagePlugins`,
-					`require(${JSON.stringify(__filename)}).getLanguageId`,
 				].join(', ')
 				+ `);\n`
 				+ s.replace('createProgram', '_createProgram')