diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index eaa64e6..0ce3073 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -154,7 +154,7 @@ export const SOURCES = {
   Python2: "",
   JavaScript: "",
   Golang: "",
-}
+} as const
 
 export const LANGUAGE_ID = {
   C: 50,
@@ -164,7 +164,7 @@ export const LANGUAGE_ID = {
   Python2: 0,
   JavaScript: 0,
   Golang: 0,
-}
+} as const
 
 export const LANGUAGE_FORMAT_VALUE = {
   C: "c",
@@ -174,7 +174,7 @@ export const LANGUAGE_FORMAT_VALUE = {
   Python3: "python",
   JavaScript: "javascript",
   Golang: "go",
-}
+} as const
 
 export const LANGUAGE_SHOW_VALUE = {
   C: "C",
@@ -184,7 +184,7 @@ export const LANGUAGE_SHOW_VALUE = {
   Python3: "Python",
   JavaScript: "JS",
   Golang: "Go",
-}
+} as const
 
 const cTemplate = `//TEMPLATE BEGIN
 #include <stdio.h>
@@ -220,7 +220,7 @@ export const CODE_TEMPLATES = {
   Java: blankTemplate,
   JavaScript: blankTemplate,
   Golang: blankTemplate,
-}
+} as const
 
 export enum ScreenMode {
   both = "题目 | 自测",
diff --git a/src/utils/types.ts b/src/utils/types.ts
index b829b9e..7cfb417 100644
--- a/src/utils/types.ts
+++ b/src/utils/types.ts
@@ -1,4 +1,4 @@
-import { ContestStatus, ContestType, USER_TYPE } from "./constants"
+import { ContestStatus, ContestType, LANGUAGE_SHOW_VALUE } from "./constants"
 
 export interface Profile {
   id: number
@@ -60,6 +60,8 @@ export type LANGUAGE =
   | "JavaScript"
   | "Golang"
 
+export type LANGUAGE_SHOW_LABEL = typeof LANGUAGE_SHOW_VALUE[keyof typeof LANGUAGE_SHOW_VALUE]
+
 export type SUBMISSION_RESULT = -2 | -1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
 
 export type ProblemStatus = "passed" | "failed" | "not_test"