diff --git a/packages/frontend-embed/src/components/EmImgWithBlurhash.vue b/packages/frontend-embed/src/components/EmImgWithBlurhash.vue
index fd1d291073..d19cd08d0a 100644
--- a/packages/frontend-embed/src/components/EmImgWithBlurhash.vue
+++ b/packages/frontend-embed/src/components/EmImgWithBlurhash.vue
@@ -14,7 +14,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import DrawBlurhash from '@/workers/draw-blurhash?worker';
 import TestWebGL2 from '@/workers/test-webgl2?worker';
 import { WorkerMultiDispatch } from '@/to-be-shared/worker-multi-dispatch.js';
-import { extractAvgColorFromBlurhash } from '@/to-be-shared/extract-avg-color-from-blurhash.js';
+import { extractAvgColorFromBlurhash } from '@@/js/extract-avg-color-from-blurhash.js';
 
 const canvasPromise = new Promise<WorkerMultiDispatch | HTMLCanvasElement>(resolve => {
 	// テスト環境で Web Worker インスタンスは作成できない
diff --git a/packages/frontend-embed/src/to-be-shared/extract-avg-color-from-blurhash.ts b/packages/frontend-shared/js/extract-avg-color-from-blurhash.ts
similarity index 100%
rename from packages/frontend-embed/src/to-be-shared/extract-avg-color-from-blurhash.ts
rename to packages/frontend-shared/js/extract-avg-color-from-blurhash.ts
diff --git a/packages/frontend/src/components/MkImgWithBlurhash.vue b/packages/frontend/src/components/MkImgWithBlurhash.vue
index 8d301f16bd..eeecf052af 100644
--- a/packages/frontend/src/components/MkImgWithBlurhash.vue
+++ b/packages/frontend/src/components/MkImgWithBlurhash.vue
@@ -24,7 +24,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import DrawBlurhash from '@/workers/draw-blurhash?worker';
 import TestWebGL2 from '@/workers/test-webgl2?worker';
 import { WorkerMultiDispatch } from '@/scripts/worker-multi-dispatch.js';
-import { extractAvgColorFromBlurhash } from '@/scripts/extract-avg-color-from-blurhash.js';
+import { extractAvgColorFromBlurhash } from '@@/js/extract-avg-color-from-blurhash.js';
 
 const canvasPromise = new Promise<WorkerMultiDispatch | HTMLCanvasElement>(resolve => {
 	// テスト環境で Web Worker インスタンスは作成できない
diff --git a/packages/frontend/src/components/global/MkAvatar.vue b/packages/frontend/src/components/global/MkAvatar.vue
index ee224dba49..35c07bc80c 100644
--- a/packages/frontend/src/components/global/MkAvatar.vue
+++ b/packages/frontend/src/components/global/MkAvatar.vue
@@ -42,10 +42,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { watch, ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';
+import { extractAvgColorFromBlurhash } from '@@/js/extract-avg-color-from-blurhash.js';
 import MkImgWithBlurhash from '../MkImgWithBlurhash.vue';
 import MkA from './MkA.vue';
 import { getStaticImageUrl } from '@/scripts/media-proxy.js';
-import { extractAvgColorFromBlurhash } from '@/scripts/extract-avg-color-from-blurhash.js';
 import { acct, userPage } from '@/filters/user.js';
 import MkUserOnlineIndicator from '@/components/MkUserOnlineIndicator.vue';
 import { defaultStore } from '@/store.js';
diff --git a/packages/frontend/src/scripts/extract-avg-color-from-blurhash.ts b/packages/frontend/src/scripts/extract-avg-color-from-blurhash.ts
deleted file mode 100644
index 992f6e9a16..0000000000
--- a/packages/frontend/src/scripts/extract-avg-color-from-blurhash.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-export function extractAvgColorFromBlurhash(hash: string) {
-	return typeof hash === 'string'
-		? '#' + [...hash.slice(2, 6)]
-			.map(x => '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~'.indexOf(x))
-			.reduce((a, c) => a * 83 + c, 0)
-			.toString(16)
-			.padStart(6, '0')
-		: undefined;
-}