diff --git a/src/platforms/GitHub/DOMHelper.ts b/src/platforms/GitHub/DOMHelper.ts
index c9c386b..c5d2b99 100644
--- a/src/platforms/GitHub/DOMHelper.ts
+++ b/src/platforms/GitHub/DOMHelper.ts
@@ -105,8 +105,8 @@ function getCurrentPageType() {
   )
 }
 
-const REPO_TYPE_PRIVATE = 'private'
-const REPO_TYPE_PUBLIC = 'public'
+const REPO_TYPE_PRIVATE = 'private' as const
+const REPO_TYPE_PUBLIC = 'public' as const
 export function getRepoPageType() {
   const headerSelector = `#js-repo-pjax-container .pagehead.repohead h1`
   return $(headerSelector, header => {
diff --git a/src/platforms/Gitee/DOMHelper.ts b/src/platforms/Gitee/DOMHelper.ts
index 2075b56..bd1a50f 100644
--- a/src/platforms/Gitee/DOMHelper.ts
+++ b/src/platforms/Gitee/DOMHelper.ts
@@ -25,8 +25,8 @@ export function getCurrentBranch() {
   raiseError(new Error('cannot get current branch'))
 }
 
-const REPO_TYPE_PRIVATE = 'private'
-const REPO_TYPE_PUBLIC = 'public'
+const REPO_TYPE_PRIVATE = 'private' as const
+const REPO_TYPE_PUBLIC = 'public' as const
 export function getRepoPageType() {
   const headerSelector = `.git-project-title .icon-lock`
   return $(