diff --git a/packages/frontend/src/components/MkDrive.vue b/packages/frontend/src/components/MkDrive.vue
index 71bb4ecfef..8dff73d994 100644
--- a/packages/frontend/src/components/MkDrive.vue
+++ b/packages/frontend/src/components/MkDrive.vue
@@ -616,7 +616,7 @@ function getMenu() {
 		type: 'switch',
 		text: i18n.ts.keepOriginalUploading,
 		ref: keepOriginal,
-	}, null, {
+	}, { type: 'divider' }, {
 		text: i18n.ts.addFile,
 		type: 'label',
 	}, {
@@ -627,7 +627,7 @@ function getMenu() {
 		text: i18n.ts.fromUrl,
 		icon: 'ti ti-link',
 		action: () => { urlUpload(); },
-	}, null, {
+	}, { type: 'divider' }, {
 		text: folder.value ? folder.value.name : i18n.ts.drive,
 		type: 'label',
 	}, folder.value ? {
diff --git a/packages/frontend/src/components/MkMenu.vue b/packages/frontend/src/components/MkMenu.vue
index 951a0b2815..af0f1ec91b 100644
--- a/packages/frontend/src/components/MkMenu.vue
+++ b/packages/frontend/src/components/MkMenu.vue
@@ -13,7 +13,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		@contextmenu.self="e => e.preventDefault()"
 	>
 		<template v-for="(item, i) in items2">
-			<div v-if="item === null" role="separator" :class="$style.divider"></div>
+			<div v-if="item.type === 'divider'" role="separator" :class="$style.divider"></div>
 			<span v-else-if="item.type === 'label'" role="menuitem" :class="[$style.label, $style.item]">
 				<span>{{ item.text }}</span>
 			</span>
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 36e3b253a2..e723198a17 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -464,7 +464,7 @@ function showRenoteMenu(viaKeyboard = false): void {
 		pleaseLogin();
 		os.popupMenu([
 			getCopyNoteLinkMenu(note.value, i18n.ts.copyLinkRenote),
-			null,
+			{ type: 'divider' },
 			getUnrenote(),
 		], renoteTime.value, {
 			viaKeyboard: viaKeyboard,
@@ -472,7 +472,7 @@ function showRenoteMenu(viaKeyboard = false): void {
 	} else {
 		os.popupMenu([
 			getCopyNoteLinkMenu(note.value, i18n.ts.copyLinkRenote),
-			null,
+			{ type: 'divider' },
 			getAbuseNoteMenu(note.value, i18n.ts.reportAbuseRenote),
 			$i.isModerator || $i.isAdmin ? getUnrenote() : undefined,
 		], renoteTime.value, {
diff --git a/packages/frontend/src/components/MkPopupMenu.vue b/packages/frontend/src/components/MkPopupMenu.vue
index 67fac003bf..95ef2d9b75 100644
--- a/packages/frontend/src/components/MkPopupMenu.vue
+++ b/packages/frontend/src/components/MkPopupMenu.vue
@@ -13,7 +13,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { ref, shallowRef } from 'vue';
 import MkModal from './MkModal.vue';
 import MkMenu from './MkMenu.vue';
-import { MenuItem } from '@/types/menu';
+import { MenuItem } from '@/types/menu.js';
 
 defineProps<{
 	items: MenuItem[];
diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index 102cb8d139..0678a7c09c 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -103,7 +103,7 @@ function showMenu(ev) {
 		action: () => {
 			os.pageWindow('/about-misskey');
 		},
-	}, null, (instance.impressumUrl) ? {
+	}, { type: 'divider' }, (instance.impressumUrl) ? {
 		text: i18n.ts.impressum,
 		icon: 'ti ti-file-invoice',
 		action: () => {
@@ -121,7 +121,7 @@ function showMenu(ev) {
 		action: () => {
 			window.open(instance.privacyPolicyUrl, '_blank', 'noopener');
 		},
-	} : undefined, (!instance.impressumUrl && !instance.tosUrl && !instance.privacyPolicyUrl) ? undefined : null, {
+	} : undefined, (!instance.impressumUrl && !instance.tosUrl && !instance.privacyPolicyUrl) ? undefined : { type: 'divider' }, {
 		text: i18n.ts.help,
 		icon: 'ti ti-help-circle',
 		action: () => {
diff --git a/packages/frontend/src/os.ts b/packages/frontend/src/os.ts
index 8aed5797e1..57f705a726 100644
--- a/packages/frontend/src/os.ts
+++ b/packages/frontend/src/os.ts
@@ -546,7 +546,7 @@ export async function openEmojiPicker(src?: HTMLElement, opts, initialTextarea:
 	});
 }
 
-export function popupMenu(items: MenuItem[] | Ref<MenuItem[]>, src?: HTMLElement, options?: {
+export function popupMenu(items: MenuItem[] | Ref<MenuItem[]>, src?: HTMLElement | null, options?: {
 	align?: string;
 	width?: number;
 	viaKeyboard?: boolean;
diff --git a/packages/frontend/src/pages/notifications.vue b/packages/frontend/src/pages/notifications.vue
index 71ce7c353b..d57bda41b5 100644
--- a/packages/frontend/src/pages/notifications.vue
+++ b/packages/frontend/src/pages/notifications.vue
@@ -60,7 +60,7 @@ function setFilter(ev) {
 		action: () => {
 			includeTypes.value = null;
 		},
-	}, null, ...typeItems] : typeItems;
+	}, { type: 'divider' }, ...typeItems] : typeItems;
 	os.popupMenu(items, ev.currentTarget ?? ev.target);
 }
 
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index 0362998855..66c549930b 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -406,7 +406,7 @@ function menu(ev: MouseEvent, profileId: string) {
 		icon: 'ti ti-download',
 		href: URL.createObjectURL(new Blob([JSON.stringify(profiles.value[profileId], null, 2)], { type: 'application/json' })),
 		download: `${profiles.value[profileId].name}.json`,
-	}, null, {
+	}, { type: 'divider' }, {
 		text: ts.rename,
 		icon: 'ti ti-forms',
 		action: () => rename(profileId),
@@ -414,7 +414,7 @@ function menu(ev: MouseEvent, profileId: string) {
 		text: ts._preferencesBackups.save,
 		icon: 'ti ti-device-floppy',
 		action: () => save(profileId),
-	}, null, {
+	}, { type: 'divider' }, {
 		text: ts.delete,
 		icon: 'ti ti-trash',
 		action: () => deleteProfile(profileId),
diff --git a/packages/frontend/src/pages/user/home.vue b/packages/frontend/src/pages/user/home.vue
index e2b205a401..ecc3bb36c1 100644
--- a/packages/frontend/src/pages/user/home.vue
+++ b/packages/frontend/src/pages/user/home.vue
@@ -232,7 +232,7 @@ const age = computed(() => {
 	return calcAge(props.user.birthday);
 });
 
-function menu(ev) {
+function menu(ev: MouseEvent) {
 	const { menu, cleanup } = getUserMenu(user.value, router);
 	os.popupMenu(menu, ev.currentTarget ?? ev.target).finally(cleanup);
 }
diff --git a/packages/frontend/src/scripts/get-drive-file-menu.ts b/packages/frontend/src/scripts/get-drive-file-menu.ts
index 23a1a77bfb..f8496f0711 100644
--- a/packages/frontend/src/scripts/get-drive-file-menu.ts
+++ b/packages/frontend/src/scripts/get-drive-file-menu.ts
@@ -82,7 +82,7 @@ export function getDriveFileMenu(file: Misskey.entities.DriveFile, folder?: Miss
 		to: `/my/drive/file/${file.id}`,
 		text: i18n.ts._fileViewer.title,
 		icon: 'ti ti-info-circle',
-	}, null, {
+	}, { type: 'divider' }, {
 		text: i18n.ts.rename,
 		icon: 'ti ti-forms',
 		action: () => rename(file),
@@ -101,7 +101,7 @@ export function getDriveFileMenu(file: Misskey.entities.DriveFile, folder?: Miss
 			aspectRatio: NaN,
 			uploadFolder: folder ? folder.id : folder,
 		}),
-	}] : [], null, {
+	}] : [], { type: 'divider' }, {
 		text: i18n.ts.createNoteFromTheFile,
 		icon: 'ti ti-pencil',
 		action: () => os.post({
@@ -118,7 +118,7 @@ export function getDriveFileMenu(file: Misskey.entities.DriveFile, folder?: Miss
 		text: i18n.ts.download,
 		icon: 'ti ti-download',
 		download: file.name,
-	}, null, {
+	}, { type: 'divider' }, {
 		text: i18n.ts.delete,
 		icon: 'ti ti-trash',
 		danger: true,
@@ -126,7 +126,7 @@ export function getDriveFileMenu(file: Misskey.entities.DriveFile, folder?: Miss
 	}];
 
 	if (defaultStore.state.devMode) {
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: 'ti ti-id',
 			text: i18n.ts.copyFileId,
 			action: () => {
diff --git a/packages/frontend/src/scripts/get-note-menu.ts b/packages/frontend/src/scripts/get-note-menu.ts
index 14ada9b7f0..1f6cfffce1 100644
--- a/packages/frontend/src/scripts/get-note-menu.ts
+++ b/packages/frontend/src/scripts/get-note-menu.ts
@@ -61,7 +61,7 @@ export async function getNoteClipMenu(props: {
 				},
 			);
 		},
-	})), null, {
+	})), { type: 'divider' }, {
 		icon: 'ti ti-plus',
 		text: i18n.ts.createNew,
 		action: async () => {
@@ -94,7 +94,7 @@ export async function getNoteClipMenu(props: {
 	}];
 }
 
-export function getAbuseNoteMenu(note: misskey.entities.Note, text: string): MenuItem {
+export function getAbuseNoteMenu(note: Misskey.entities.Note, text: string): MenuItem {
 	return {
 		icon: 'ti ti-exclamation-circle',
 		text,
@@ -108,7 +108,7 @@ export function getAbuseNoteMenu(note: misskey.entities.Note, text: string): Men
 	};
 }
 
-export function getCopyNoteLinkMenu(note: misskey.entities.Note, text: string): MenuItem {
+export function getCopyNoteLinkMenu(note: Misskey.entities.Note, text: string): MenuItem {
 	return {
 		icon: 'ti ti-link',
 		text,
@@ -264,7 +264,7 @@ export function getNoteMenu(props: {
 					text: i18n.ts.unclip,
 					danger: true,
 					action: unclip,
-				}, null] : []
+				}, { type: 'divider' }] : []
 			), {
 				icon: 'ti ti-info-circle',
 				text: i18n.ts.details,
@@ -291,7 +291,7 @@ export function getNoteMenu(props: {
 				text: i18n.ts.translate,
 				action: translate,
 			} : undefined,
-			null,
+			{ type: 'divider' },
 			statePromise.then(state => state.isFavorited ? {
 				icon: 'ti ti-star-off',
 				text: i18n.ts.unfavorite,
@@ -338,7 +338,7 @@ export function getNoteMenu(props: {
 			},
 			/*
 		...($i.isModerator || $i.isAdmin ? [
-			null,
+			{ type: 'divider' },
 			{
 				icon: 'ti ti-speakerphone',
 				text: i18n.ts.promote,
@@ -347,13 +347,13 @@ export function getNoteMenu(props: {
 			: []
 		),*/
 			...(appearNote.userId !== $i.id ? [
-				null,
+				{ type: 'divider' },
 				appearNote.userId !== $i.id ? getAbuseNoteMenu(appearNote, i18n.ts.reportAbuse) : undefined,
 			]
 			: []
 			),
 			...(appearNote.userId === $i.id || $i.isModerator || $i.isAdmin ? [
-				null,
+				{ type: 'divider' },
 				appearNote.userId === $i.id ? {
 					icon: 'ti ti-edit',
 					text: i18n.ts.deleteAndEdit,
@@ -528,10 +528,9 @@ export function getRenoteMenu(props: {
 		}]);
 	}
 
-	// nullを挟むことで区切り線を出せる
 	const renoteItems = [
 		...normalRenoteItems,
-		...(channelRenoteItems.length > 0 && normalRenoteItems.length > 0) ? [null] : [],
+		...(channelRenoteItems.length > 0 && normalRenoteItems.length > 0) ? [{ type: 'divider' }] : [],
 		...channelRenoteItems,
 	];
 
diff --git a/packages/frontend/src/scripts/get-user-menu.ts b/packages/frontend/src/scripts/get-user-menu.ts
index f62f737568..6e5c689d97 100644
--- a/packages/frontend/src/scripts/get-user-menu.ts
+++ b/packages/frontend/src/scripts/get-user-menu.ts
@@ -119,7 +119,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 			userId: user.id,
 		});
 	}
-	
+
 	async function invalidateFollow() {
 		if (!await getConfirmed(i18n.ts.breakFollowConfirm)) return;
 
@@ -183,7 +183,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 			const canonical = user.host === null ? `@${user.username}` : `@${user.username}@${user.host}`;
 			os.post({ specified: user, initialText: `${canonical} ` });
 		},
-	}, null, {
+	}, { type: 'divider' }, {
 		icon: 'ti ti-pencil',
 		text: i18n.ts.editMemo,
 		action: () => {
@@ -307,7 +307,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 		}]);
 		//}
 
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: user.isMuted ? 'ti ti-eye' : 'ti ti-eye-off',
 			text: user.isMuted ? i18n.ts.unmute : i18n.ts.mute,
 			action: toggleMute,
@@ -329,7 +329,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 			}]);
 		}
 
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: 'ti ti-exclamation-circle',
 			text: i18n.ts.reportAbuse,
 			action: reportAbuse,
@@ -337,15 +337,15 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 	}
 
 	if (user.host !== null) {
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: 'ti ti-refresh',
 			text: i18n.ts.updateRemoteUser,
 			action: userInfoUpdate,
 		}]);
 	}
-	
+
 	if (defaultStore.state.devMode) {
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: 'ti ti-id',
 			text: i18n.ts.copyUserId,
 			action: () => {
@@ -355,7 +355,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 	}
 
 	if ($i && meId === user.id) {
-		menu = menu.concat([null, {
+		menu = menu.concat([{ type: 'divider' }, {
 			icon: 'ti ti-pencil',
 			text: i18n.ts.editProfile,
 			action: () => {
@@ -365,7 +365,7 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 	}
 
 	if (userActions.length > 0) {
-		menu = menu.concat([null, ...userActions.map(action => ({
+		menu = menu.concat([{ type: 'divider' }, ...userActions.map(action => ({
 			icon: 'ti ti-plug',
 			text: action.title,
 			action: () => {
diff --git a/packages/frontend/src/types/menu.ts b/packages/frontend/src/types/menu.ts
index fbe627176b..f4516bbe5b 100644
--- a/packages/frontend/src/types/menu.ts
+++ b/packages/frontend/src/types/menu.ts
@@ -8,7 +8,7 @@ import { Ref } from 'vue';
 
 export type MenuAction = (ev: MouseEvent) => void;
 
-export type MenuDivider = null;
+export type MenuDivider = { type: 'divider' };
 export type MenuNull = undefined;
 export type MenuLabel = { type: 'label', text: string };
 export type MenuLink = { type: 'link', to: string, text: string, icon?: string, indicate?: boolean, avatar?: Misskey.entities.User };
diff --git a/packages/frontend/src/ui/_common_/common.ts b/packages/frontend/src/ui/_common_/common.ts
index 48a1144df7..bfafe3dd96 100644
--- a/packages/frontend/src/ui/_common_/common.ts
+++ b/packages/frontend/src/ui/_common_/common.ts
@@ -64,7 +64,7 @@ export function openInstanceMenu(ev: MouseEvent) {
 		text: i18n.ts.charts,
 		icon: 'ti ti-chart-line',
 		to: '/about#charts',
-	}, null, {
+	}, { type: 'divider' }, {
 		type: 'link',
 		text: i18n.ts.ads,
 		icon: 'ti ti-ad',
@@ -79,7 +79,7 @@ export function openInstanceMenu(ev: MouseEvent) {
 		text: i18n.ts.tools,
 		icon: 'ti ti-tool',
 		children: toolsMenuItems(),
-	}, null, (instance.impressumUrl) ? {
+	}, { type: 'divider' }, (instance.impressumUrl) ? {
 		text: i18n.ts.impressum,
 		icon: 'ti ti-file-invoice',
 		action: () => {
@@ -97,7 +97,7 @@ export function openInstanceMenu(ev: MouseEvent) {
 		action: () => {
 			window.open(instance.privacyPolicyUrl, '_blank', 'noopener');
 		},
-	} : undefined, (!instance.impressumUrl && !instance.tosUrl && !instance.privacyPolicyUrl) ? undefined : null, {
+	} : undefined, (!instance.impressumUrl && !instance.tosUrl && !instance.privacyPolicyUrl) ? undefined : { type: 'divider' }, {
 		text: i18n.ts.help,
 		icon: 'ti ti-help-circle',
 		action: () => {
diff --git a/packages/frontend/src/ui/deck.vue b/packages/frontend/src/ui/deck.vue
index 3e3e2b949c..1c459cbf3a 100644
--- a/packages/frontend/src/ui/deck.vue
+++ b/packages/frontend/src/ui/deck.vue
@@ -236,7 +236,7 @@ function changeProfile(ev: MouseEvent) {
 				deckStore.set('profile', k);
 				unisonReload();
 			},
-		}))), null, {
+		}))), { type: 'divider' }, {
 			text: i18n.ts._deck.newProfile,
 			icon: 'ti ti-plus',
 			action: async () => {
diff --git a/packages/frontend/src/ui/deck/column.vue b/packages/frontend/src/ui/deck/column.vue
index 39a0279dea..f5463d6921 100644
--- a/packages/frontend/src/ui/deck/column.vue
+++ b/packages/frontend/src/ui/deck/column.vue
@@ -104,7 +104,7 @@ function toggleActive() {
 }
 
 function getMenu() {
-	let items = [{
+	let items: MenuItem[] = [{
 		icon: 'ti ti-settings',
 		text: i18n.ts._deck.configureColumn,
 		action: async () => {
@@ -170,7 +170,7 @@ function getMenu() {
 		action: () => {
 			popRightColumn(props.column.id);
 		},
-	} : undefined, null, {
+	} : undefined, { type: 'divider' }, {
 		icon: 'ti ti-trash',
 		text: i18n.ts.remove,
 		danger: true,
@@ -180,7 +180,7 @@ function getMenu() {
 	}];
 
 	if (props.menu) {
-		items.unshift(null);
+		items.unshift({ type: 'divider' });
 		items = props.menu.concat(items);
 	}
 
diff --git a/packages/frontend/src/widgets/WidgetTimeline.vue b/packages/frontend/src/widgets/WidgetTimeline.vue
index b8842d7b52..a2d49f62af 100644
--- a/packages/frontend/src/widgets/WidgetTimeline.vue
+++ b/packages/frontend/src/widgets/WidgetTimeline.vue
@@ -130,7 +130,7 @@ const choose = async (ev) => {
 		text: i18n.ts._timelines.global,
 		icon: 'ti ti-whirl',
 		action: () => { setSrc('global'); },
-	}, antennaItems.length > 0 ? null : undefined, ...antennaItems, listItems.length > 0 ? null : undefined, ...listItems], ev.currentTarget ?? ev.target).then(() => {
+	}, antennaItems.length > 0 ? { type: 'divider' } : undefined, ...antennaItems, listItems.length > 0 ? { type: 'divider' } : undefined, ...listItems], ev.currentTarget ?? ev.target).then(() => {
 		menuOpened.value = false;
 	});
 };