diff --git a/packages/backend/src/misc/detect-language.ts b/packages/backend/src/misc/detect-language.ts
index 446f85878b..6147247dee 100644
--- a/packages/backend/src/misc/detect-language.ts
+++ b/packages/backend/src/misc/detect-language.ts
@@ -1,7 +1,7 @@
 import { detect } from "tinyld";
 import * as mfm from "mfm-js";
 
-export default function detectLanguage(text: string) {
+export default function detectLanguage(text: string): string {
 	const nodes = mfm.parse(text);
 	const filtered = mfm.extract(nodes, (node) => {
 		return node.type === "text" || node.type === "quote";
diff --git a/packages/client/src/components/MkNote.vue b/packages/client/src/components/MkNote.vue
index f790889c38..c9228bfda1 100644
--- a/packages/client/src/components/MkNote.vue
+++ b/packages/client/src/components/MkNote.vue
@@ -276,7 +276,6 @@ import { computed, inject, onMounted, ref } from "vue";
 import * as mfm from "mfm-js";
 import type { Ref } from "vue";
 import type * as firefish from "firefish-js";
-import { detect as detectLanguage_ } from "tinyld";
 import MkSubNoteContent from "./MkSubNoteContent.vue";
 import MkNoteSub from "@/components/MkNoteSub.vue";
 import XNoteHeader from "@/components/MkNoteHeader.vue";
@@ -287,6 +286,7 @@ import XStarButtonNoEmoji from "@/components/MkStarButtonNoEmoji.vue";
 import XQuoteButton from "@/components/MkQuoteButton.vue";
 import MkVisibility from "@/components/MkVisibility.vue";
 import copyToClipboard from "@/scripts/copy-to-clipboard";
+import detectLanguage from "@/scripts/detect-language";
 import { url } from "@/config";
 import { pleaseLogin } from "@/scripts/please-login";
 import { focusNext, focusPrev } from "@/scripts/focus";
@@ -372,15 +372,6 @@ const expandOnNoteClick = defaultStore.state.expandOnNoteClick;
 const lang = localStorage.getItem("lang");
 const translateLang = localStorage.getItem("translateLang");
 
-function detectLanguage(text: string) {
-	const nodes = mfm.parse(text);
-	const filtered = mfm.extract(nodes, (node) => {
-		return node.type === "text" || node.type === "quote";
-	});
-	const purified = mfm.toString(filtered);
-	return detectLanguage_(purified);
-}
-
 const isForeignLanguage: boolean =
 	defaultStore.state.detectPostLanguage &&
 	appearNote.value.text != null &&
diff --git a/packages/client/src/components/MkNoteSub.vue b/packages/client/src/components/MkNoteSub.vue
index 5deee1f88b..73f45b2fa6 100644
--- a/packages/client/src/components/MkNoteSub.vue
+++ b/packages/client/src/components/MkNoteSub.vue
@@ -193,7 +193,6 @@ import { computed, inject, ref } from "vue";
 import type { Ref } from "vue";
 import type * as firefish from "firefish-js";
 import * as mfm from "mfm-js";
-import { detect as detectLanguage_ } from "tinyld";
 import XNoteHeader from "@/components/MkNoteHeader.vue";
 import MkSubNoteContent from "@/components/MkSubNoteContent.vue";
 import XReactionsViewer from "@/components/MkReactionsViewer.vue";
@@ -202,6 +201,7 @@ import XStarButtonNoEmoji from "@/components/MkStarButtonNoEmoji.vue";
 import XRenoteButton from "@/components/MkRenoteButton.vue";
 import XQuoteButton from "@/components/MkQuoteButton.vue";
 import copyToClipboard from "@/scripts/copy-to-clipboard";
+import detectLanguage from "@/scripts/detect-language";
 import { url } from "@/config";
 import { pleaseLogin } from "@/scripts/please-login";
 import { getNoteMenu } from "@/scripts/get-note-menu";
@@ -288,15 +288,6 @@ const expandOnNoteClick = defaultStore.state.expandOnNoteClick;
 const lang = localStorage.getItem("lang");
 const translateLang = localStorage.getItem("translateLang");
 
-function detectLanguage(text: string) {
-	const nodes = mfm.parse(text);
-	const filtered = mfm.extract(nodes, (node) => {
-		return node.type === "text" || node.type === "quote";
-	});
-	const purified = mfm.toString(filtered);
-	return detectLanguage_(purified);
-}
-
 const isForeignLanguage: boolean =
 	defaultStore.state.detectPostLanguage &&
 	appearNote.value.text != null &&
diff --git a/packages/client/src/scripts/detect-language.ts b/packages/client/src/scripts/detect-language.ts
new file mode 100644
index 0000000000..6147247dee
--- /dev/null
+++ b/packages/client/src/scripts/detect-language.ts
@@ -0,0 +1,11 @@
+import { detect } from "tinyld";
+import * as mfm from "mfm-js";
+
+export default function detectLanguage(text: string): string {
+	const nodes = mfm.parse(text);
+	const filtered = mfm.extract(nodes, (node) => {
+		return node.type === "text" || node.type === "quote";
+	});
+	const purified = mfm.toString(filtered);
+	return detect(purified);
+}