diff --git a/packages/frontend-embed/src/components/EmAvatar.vue b/packages/frontend-embed/src/components/EmAvatar.vue
index d4aeff10ed..d3601b0ab4 100644
--- a/packages/frontend-embed/src/components/EmAvatar.vue
+++ b/packages/frontend-embed/src/components/EmAvatar.vue
@@ -5,8 +5,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <component :is="link ? EmA : 'span'" v-bind="bound" class="_noSelect" :class="[$style.root, { [$style.cat]: user.isCat }]" @click="onClick">
-	<MkImgWithBlurhash :class="$style.inner" :src="url" :hash="user.avatarBlurhash" :cover="true" :onlyAvgColor="true"/>
-	<MkUserOnlineIndicator v-if="indicator" :class="$style.indicator" :user="user"/>
+	<EmImgWithBlurhash :class="$style.inner" :src="url" :hash="user.avatarBlurhash" :cover="true" :onlyAvgColor="true"/>
+	<EmUserOnlineIndicator v-if="indicator" :class="$style.indicator" :user="user"/>
 	<div v-if="user.isCat" :class="[$style.ears]">
 		<div :class="$style.earLeft">
 			<div v-if="false" :class="$style.layer">
@@ -40,10 +40,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed } from 'vue';
 import * as Misskey from 'misskey-js';
-import MkImgWithBlurhash from '../MkImgWithBlurhash.vue';
+import EmImgWithBlurhash from './EmImgWithBlurhash.vue';
 import EmA from './EmA.vue';
 import { userPage } from '@/utils.js';
-import MkUserOnlineIndicator from '@/components/MkUserOnlineIndicator.vue';
+import EmUserOnlineIndicator from '@/components/EmUserOnlineIndicator.vue';
 
 const props = withDefaults(defineProps<{
 	user: Misskey.entities.User;
diff --git a/packages/frontend-embed/src/components/EmMediaImage.vue b/packages/frontend-embed/src/components/EmMediaImage.vue
index 25b96ab6f9..fe1aa5a877 100644
--- a/packages/frontend-embed/src/components/EmMediaImage.vue
+++ b/packages/frontend-embed/src/components/EmMediaImage.vue
@@ -45,7 +45,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';
-import ImgWithBlurhash from '@/components/MkImgWithBlurhash.vue';
+import ImgWithBlurhash from '@/components/EmImgWithBlurhash.vue';
 import { i18n } from '@/i18n.js';
 
 const props = withDefaults(defineProps<{
diff --git a/packages/frontend-embed/src/components/EmMediaList.vue b/packages/frontend-embed/src/components/EmMediaList.vue
index c5a543ad06..8e8bdee3a7 100644
--- a/packages/frontend-embed/src/components/EmMediaList.vue
+++ b/packages/frontend-embed/src/components/EmMediaList.vue
@@ -30,7 +30,7 @@ import * as Misskey from 'misskey-js';
 import XBanner from './EmMediaBanner.vue';
 import XImage from './EmMediaImage.vue';
 import XVideo from './EmMediaVideo.vue';
-import { FILE_TYPE_BROWSERSAFE } from '@/const.js';
+import { FILE_TYPE_BROWSERSAFE } from '@/to-be-shared/const.js';
 
 const props = defineProps<{
 	mediaList: Misskey.entities.DriveFile[];
diff --git a/packages/frontend-embed/src/to-be-shared/const.ts b/packages/frontend-embed/src/to-be-shared/const.ts
new file mode 100644
index 0000000000..e135bc69a0
--- /dev/null
+++ b/packages/frontend-embed/src/to-be-shared/const.ts
@@ -0,0 +1,137 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// ブラウザで直接表示することを許可するファイルの種類のリスト
+// ここに含まれないものは application/octet-stream としてレスポンスされる
+// SVGはXSSを生むので許可しない
+export const FILE_TYPE_BROWSERSAFE = [
+	// Images
+	'image/png',
+	'image/gif',
+	'image/jpeg',
+	'image/webp',
+	'image/avif',
+	'image/apng',
+	'image/bmp',
+	'image/tiff',
+	'image/x-icon',
+
+	// OggS
+	'audio/opus',
+	'video/ogg',
+	'audio/ogg',
+	'application/ogg',
+
+	// ISO/IEC base media file format
+	'video/quicktime',
+	'video/mp4',
+	'audio/mp4',
+	'video/x-m4v',
+	'audio/x-m4a',
+	'video/3gpp',
+	'video/3gpp2',
+
+	'video/mpeg',
+	'audio/mpeg',
+
+	'video/webm',
+	'audio/webm',
+
+	'audio/aac',
+
+	// see https://github.com/misskey-dev/misskey/pull/10686
+	'audio/flac',
+	'audio/wav',
+	// backward compatibility
+	'audio/x-flac',
+	'audio/vnd.wave',
+];
+/*
+https://github.com/sindresorhus/file-type/blob/main/supported.js
+https://github.com/sindresorhus/file-type/blob/main/core.js
+https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Containers
+*/
+
+export const notificationTypes = [
+	'note',
+	'follow',
+	'mention',
+	'reply',
+	'renote',
+	'quote',
+	'reaction',
+	'pollEnded',
+	'receiveFollowRequest',
+	'followRequestAccepted',
+	'roleAssigned',
+	'achievementEarned',
+	'app',
+] as const;
+export const obsoleteNotificationTypes = ['pollVote', 'groupInvited'] as const;
+
+export const ROLE_POLICIES = [
+	'gtlAvailable',
+	'ltlAvailable',
+	'canPublicNote',
+	'mentionLimit',
+	'canInvite',
+	'inviteLimit',
+	'inviteLimitCycle',
+	'inviteExpirationTime',
+	'canManageCustomEmojis',
+	'canManageAvatarDecorations',
+	'canSearchNotes',
+	'canUseTranslator',
+	'canHideAds',
+	'driveCapacityMb',
+	'alwaysMarkNsfw',
+	'canUpdateBioMedia',
+	'pinLimit',
+	'antennaLimit',
+	'wordMuteLimit',
+	'webhookLimit',
+	'clipLimit',
+	'noteEachClipsLimit',
+	'userListLimit',
+	'userEachUserListsLimit',
+	'rateLimitFactor',
+	'avatarDecorationLimit',
+] as const;
+
+// なんか動かない
+//export const CURRENT_STICKY_TOP = Symbol('CURRENT_STICKY_TOP');
+//export const CURRENT_STICKY_BOTTOM = Symbol('CURRENT_STICKY_BOTTOM');
+export const CURRENT_STICKY_TOP = 'CURRENT_STICKY_TOP';
+export const CURRENT_STICKY_BOTTOM = 'CURRENT_STICKY_BOTTOM';
+
+export const DEFAULT_SERVER_ERROR_IMAGE_URL = 'https://xn--931a.moe/assets/error.jpg';
+export const DEFAULT_NOT_FOUND_IMAGE_URL = 'https://xn--931a.moe/assets/not-found.jpg';
+export const DEFAULT_INFO_IMAGE_URL = 'https://xn--931a.moe/assets/info.jpg';
+
+export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'scale', 'position', 'fg', 'bg', 'border', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'ruby', 'unixtime'];
+export const MFM_PARAMS: Record<typeof MFM_TAGS[number], string[]> = {
+	tada: ['speed=', 'delay='],
+	jelly: ['speed=', 'delay='],
+	twitch: ['speed=', 'delay='],
+	shake: ['speed=', 'delay='],
+	spin: ['speed=', 'delay=', 'left', 'alternate', 'x', 'y'],
+	jump: ['speed=', 'delay='],
+	bounce: ['speed=', 'delay='],
+	flip: ['h', 'v'],
+	x2: [],
+	x3: [],
+	x4: [],
+	scale: ['x=', 'y='],
+	position: ['x=', 'y='],
+	fg: ['color='],
+	bg: ['color='],
+  border: ['width=', 'style=', 'color=', 'radius=', 'noclip'],
+	font: ['serif', 'monospace', 'cursive', 'fantasy', 'emoji', 'math'],
+	blur: [],
+	rainbow: ['speed=', 'delay='],
+	rotate: ['deg='],
+	ruby: [],
+	unixtime: [],
+};