Fix

src/api/chrome/i18n.ts

@@ -1,10 +1,10 @@
+// Bug of chrome:
+// chrome.i18n.getUILanguage may not work in background
 export function getUILanguage(): string {
-    return chrome.i18n.getUILanguage()
+  return chrome?.i18n?.getUILanguage?.()
 }
 
-// Bug of chrome： 
+// Bug of chrome：
 // chrome.i18n.getMessage may not work in background
 // @see https://stackoverflow.com/questions/6089707/calling-chrome-i18n-getmessage-from-a-content-script
-export function getMessage(messageName: string): string {
-    return chrome.i18n.getMessage(messageName)
-}
+export const getMessage: (key: string) => string = chrome?.i18n?.getMessage

src/i18n/chrome/t.ts

@@ -1,13 +1,21 @@
 /**
  * Copyright (c) 2021 Hengyang Zhang
- * 
+ *
  * This software is released under the MIT License.
  * https://opensource.org/licenses/MIT
  */
 
-import { getMessage } from "@api/chrome/i18n"
-import { router, ChromeMessage } from "./message"
+import { getMessage } from '@api/chrome/i18n'
+import messages, { router, ChromeMessage } from './message'
+import { t } from '..'
+import { IS_CHROME } from '@util/constant/environment'
 
 export const keyPathOf = (key: (root: ChromeMessage) => string) => key(router)
 
-export const t2Chrome = (key: (root: ChromeMessage) => string) => getMessage(keyPathOf(key))
+export const t2Chrome = (key: (root: ChromeMessage) => string) => {
+  if (getMessage) {
+    return getMessage(keyPathOf(key))
+  }
+  console.error(IS_CHROME)
+  return t<ChromeMessage>(messages, { key }, 'en')
+}