diff --git a/packages/frontend/src/components/MkCwButton.vue b/packages/frontend/src/components/MkCwButton.vue
index 4a6d2dfba2..8d5c0ee559 100644
--- a/packages/frontend/src/components/MkCwButton.vue
+++ b/packages/frontend/src/components/MkCwButton.vue
@@ -17,22 +17,14 @@ import MkButton from '@/components/MkButton.vue';
 const props = defineProps<{
 	modelValue: boolean;
 	text: string | null;
-	renote: Misskey.entities.Note | null;
-	files: Misskey.entities.DriveFile[];
-	poll?: {
-		expiresAt: string | null;
-		multiple: boolean;
-		choices: {
-			isVoted: boolean;
-			text: string;
-			votes: number;
-		}[];
-	} | {
+	renote?: Misskey.entities.Note | null;
+	files?: Misskey.entities.DriveFile[];
+	poll?: Misskey.entities.Note['poll'] | {
 		choices: string[];
 		multiple: boolean;
 		expiresAt: string | null;
 		expiredAfter: string | null;
-	};
+	} | null;
 }>();
 
 const emit = defineEmits<{
@@ -43,7 +35,7 @@ const label = computed(() => {
 	return concat([
 		props.text ? [i18n.t('_cw.chars', { count: props.text.length })] : [],
 		props.renote ? [i18n.ts.quote] : [],
-		props.files.length !== 0 ? [i18n.t('_cw.files', { count: props.files.length })] : [],
+		props.files && props.files.length !== 0 ? [i18n.t('_cw.files', { count: props.files.length })] : [],
 		props.poll != null ? [i18n.ts.poll] : [],
 	] as string[][]).join(' / ');
 });
diff --git a/packages/frontend/src/components/MkInstanceTicker.vue b/packages/frontend/src/components/MkInstanceTicker.vue
index b16838dcd5..27cd693481 100644
--- a/packages/frontend/src/components/MkInstanceTicker.vue
+++ b/packages/frontend/src/components/MkInstanceTicker.vue
@@ -18,9 +18,9 @@ import { getProxiedImageUrlNullable } from '@/scripts/media-proxy.js';
 
 const props = defineProps<{
 	instance?: {
-		faviconUrl?: string
-		name: string
-		themeColor?: string
+		faviconUrl?: string | null
+		name?: string | null
+		themeColor?: string | null
 	}
 }>();
 
diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index 09c5ad9222..4938754bcd 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -52,7 +52,7 @@ const count = computed(() => props.mediaList.filter(media => previewable(media))
 let lightbox: PhotoSwipeLightbox | null;
 
 const popstateHandler = (): void => {
-	if (lightbox.pswp && lightbox.pswp.isOpen === true) {
+	if (lightbox?.pswp && lightbox.pswp.isOpen === true) {
 		lightbox.pswp.close();
 	}
 };
@@ -67,7 +67,10 @@ async function calcAspectRatio() {
 		return;
 	}
 
-	const ratioMax = (ratio: number) => `${Math.max(ratio, img.properties.width / img.properties.height).toString()} / 1`;
+	const ratioMax = (ratio: number) => {
+		if (!img.properties.width || !img.properties.height) return '';
+		return `${Math.max(ratio, img.properties.width / img.properties.height).toString()} / 1`;
+	};
 
 	switch (defaultStore.state.mediaListWithOneImageAppearance) {
 		case '16_9':
@@ -137,7 +140,7 @@ onMounted(() => {
 		// element is children
 		const { element } = itemData;
 
-		const id = element.dataset.id;
+		const id = element?.dataset.id;
 		const file = props.mediaList.find(media => media.id === id);
 		if (!file) return;
 
@@ -147,14 +150,14 @@ onMounted(() => {
 		if (file.properties.orientation != null && file.properties.orientation >= 5) {
 			[itemData.w, itemData.h] = [itemData.h, itemData.w];
 		}
-		itemData.msrc = file.thumbnailUrl;
+		itemData.msrc = file.thumbnailUrl ?? undefined;
 		itemData.alt = file.comment ?? file.name;
 		itemData.comment = file.comment ?? file.name;
 		itemData.thumbCropped = true;
 	});
 
 	lightbox.on('uiRegister', () => {
-		lightbox.pswp.ui.registerElement({
+		lightbox?.pswp?.ui?.registerElement({
 			name: 'altText',
 			className: 'pwsp__alt-text-container',
 			appendTo: 'wrapper',
@@ -163,8 +166,8 @@ onMounted(() => {
 				textBox.className = 'pwsp__alt-text _acrylic';
 				el.appendChild(textBox);
 
-				pwsp.on('change', (a) => {
-					textBox.textContent = pwsp.currSlide.data.comment;
+				pwsp.on('change', () => {
+					textBox.textContent = pwsp.currSlide?.data.comment;
 				});
 			},
 		});
diff --git a/packages/frontend/src/components/MkMediaVideo.vue b/packages/frontend/src/components/MkMediaVideo.vue
index f9dba0b15a..53d4393b10 100644
--- a/packages/frontend/src/components/MkMediaVideo.vue
+++ b/packages/frontend/src/components/MkMediaVideo.vue
@@ -16,8 +16,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<video
 		ref="videoEl"
 		:class="$style.video"
-		:poster="video.thumbnailUrl"
-		:title="video.comment"
+		:poster="video.thumbnailUrl ?? undefined"
+		:title="video.comment ?? undefined"
 		:alt="video.comment"
 		preload="none"
 		controls
@@ -51,7 +51,7 @@ watch(videoEl, () => {
 	if (videoEl.value) {
 		videoEl.value.volume = 0.3;
 		hasAudio(videoEl.value).then(had => {
-			if (!had) {
+			if (!had && videoEl.value) {
 				videoEl.value.loop = videoEl.value.muted = true;
 				videoEl.value.play();
 			}
diff --git a/packages/frontend/src/components/MkMenu.child.vue b/packages/frontend/src/components/MkMenu.child.vue
index 962dcd91eb..46be75e849 100644
--- a/packages/frontend/src/components/MkMenu.child.vue
+++ b/packages/frontend/src/components/MkMenu.child.vue
@@ -33,6 +33,7 @@ const align = 'left';
 const SCROLLBAR_THICKNESS = 16;
 
 function setPosition() {
+	if (!el.value) return;
 	const rootRect = props.rootElement.getBoundingClientRect();
 	const parentRect = props.targetElement.getBoundingClientRect();
 	const myRect = el.value.getBoundingClientRect();
@@ -66,7 +67,7 @@ const ro = new ResizeObserver((entries, observer) => {
 });
 
 onMounted(() => {
-	ro.observe(el.value);
+	if (el.value) ro.observe(el.value);
 	setPosition();
 	nextTick(() => {
 		setPosition();
@@ -79,7 +80,7 @@ onUnmounted(() => {
 
 defineExpose({
 	checkHit: (ev: MouseEvent) => {
-		return (ev.target === el.value || el.value.contains(ev.target));
+		return (ev.target === el.value || el.value?.contains(ev.target as Node));
 	},
 });
 </script>
diff --git a/packages/frontend/src/components/MkMenu.vue b/packages/frontend/src/components/MkMenu.vue
index 3026d4f015..a70a76ca58 100644
--- a/packages/frontend/src/components/MkMenu.vue
+++ b/packages/frontend/src/components/MkMenu.vue
@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		:style="{ width: (width && !asDrawer) ? width + 'px' : '', maxHeight: maxHeight ? maxHeight + 'px' : '' }"
 		@contextmenu.self="e => e.preventDefault()"
 	>
-		<template v-for="(item, i) in items2">
+		<template v-for="(item, i) in (items2 ?? [])">
 			<div v-if="item.type === 'divider'" role="separator" :class="$style.divider"></div>
 			<span v-else-if="item.type === 'label'" role="menuitem" :class="[$style.label, $style.item]">
 				<span style="opacity: 0.7;">{{ item.text }}</span>
@@ -63,12 +63,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</div>
 			</button>
 		</template>
-		<span v-if="items2.length === 0" :class="[$style.none, $style.item]">
+		<span v-if="!items2 || items2.length === 0" :class="[$style.none, $style.item]">
 			<span>{{ i18n.ts.none }}</span>
 		</span>
 	</div>
 	<div v-if="childMenu">
-		<XChild ref="child" :items="childMenu" :targetElement="childTarget" :rootElement="itemsEl" showing @actioned="childActioned" @close="close(false)"/>
+		<XChild ref="child" :items="childMenu" :targetElement="childTarget!" :rootElement="itemsEl!" showing @actioned="childActioned" @close="close(false)"/>
 	</div>
 </div>
 </template>
@@ -104,7 +104,7 @@ const emit = defineEmits<{
 
 const itemsEl = shallowRef<HTMLDivElement>();
 
-const items2 = ref<InnerMenuItem[]>([]);
+const items2 = ref<InnerMenuItem[]>();
 
 const child = shallowRef<InstanceType<typeof XChild>>();
 
@@ -119,15 +119,15 @@ const childShowingItem = ref<MenuItem | null>();
 let preferClick = isTouchUsing || props.asDrawer;
 
 watch(() => props.items, () => {
-	const items: (MenuItem | MenuPending)[] = [...props.items].filter(item => item !== undefined);
+	const items = [...props.items].filter(item => item !== undefined) as (NonNullable<MenuItem> | MenuPending)[];
 
 	for (let i = 0; i < items.length; i++) {
 		const item = items[i];
 
-		if (item && 'then' in item) { // if item is Promise
+		if ('then' in item) { // if item is Promise
 			items[i] = { type: 'pending' };
 			item.then(actualItem => {
-				items2.value[i] = actualItem;
+				if (items2.value?.[i]) items2.value[i] = actualItem;
 			});
 		}
 	}
@@ -151,7 +151,7 @@ function childActioned() {
 }
 
 const onGlobalMousedown = (event: MouseEvent) => {
-	if (childTarget.value && (event.target === childTarget.value || childTarget.value.contains(event.target))) return;
+	if (childTarget.value && (event.target === childTarget.value || childTarget.value.contains(event.target as Node))) return;
 	if (child.value && child.value.checkHit(event)) return;
 	closeChild();
 };
@@ -169,7 +169,7 @@ function onItemMouseLeave(item) {
 }
 
 async function showChildren(item: MenuParent, ev: MouseEvent) {
-	const children = await (async () => {
+	const children: MenuItem[] = await (async () => {
 		if (childrenCache.has(item)) {
 			return childrenCache.get(item)!;
 		} else {
@@ -189,7 +189,7 @@ async function showChildren(item: MenuParent, ev: MouseEvent) {
 		});
 		emit('hide');
 	} else {
-		childTarget.value = ev.currentTarget ?? ev.target;
+		childTarget.value = (ev.currentTarget ?? ev.target) as HTMLElement;
 		// これでもリアクティビティは保たれる
 		childMenu.value = children;
 		childShowingItem.value = item;
diff --git a/packages/frontend/src/components/MkMiniChart.vue b/packages/frontend/src/components/MkMiniChart.vue
index f0a2c232bd..bf36c230c9 100644
--- a/packages/frontend/src/components/MkMiniChart.vue
+++ b/packages/frontend/src/components/MkMiniChart.vue
@@ -22,8 +22,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		stroke-width="2"
 	/>
 	<circle
-		:cx="headX"
-		:cy="headY"
+		:cx="headX ?? undefined"
+		:cy="headY ?? undefined"
 		r="3"
 		:fill="color"
 	/>
diff --git a/packages/frontend/src/components/MkModalWindow.vue b/packages/frontend/src/components/MkModalWindow.vue
index 7e185e8453..c1aa6014ea 100644
--- a/packages/frontend/src/components/MkModalWindow.vue
+++ b/packages/frontend/src/components/MkModalWindow.vue
@@ -51,7 +51,7 @@ const bodyWidth = ref(0);
 const bodyHeight = ref(0);
 
 const close = () => {
-	modal.value.close();
+	modal.value?.close();
 };
 
 const onBgClick = () => {
@@ -67,11 +67,13 @@ const onKeydown = (evt) => {
 };
 
 const ro = new ResizeObserver((entries, observer) => {
+	if (!rootEl.value || !headerEl.value) return;
 	bodyWidth.value = rootEl.value.offsetWidth;
 	bodyHeight.value = rootEl.value.offsetHeight - headerEl.value.offsetHeight;
 });
 
 onMounted(() => {
+	if (!rootEl.value || !headerEl.value) return;
 	bodyWidth.value = rootEl.value.offsetWidth;
 	bodyHeight.value = rootEl.value.offsetHeight - headerEl.value.offsetHeight;
 	ro.observe(rootEl.value);
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 3ec9c3c46a..ab281dbe59 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -7,7 +7,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div
 	v-if="!hardMuted && !muted"
 	v-show="!isDeleted"
-	ref="el"
+	ref="rootEl"
 	v-hotkey="keymap"
 	:class="[$style.root, { [$style.showActionsOnlyHover]: defaultStore.state.showNoteActionsOnlyHover }]"
 	:tabindex="!isDeleted ? '-1' : undefined"
@@ -72,16 +72,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 						/>
 						<div v-if="translating || translation" :class="$style.translation">
 							<MkLoading v-if="translating" mini/>
-							<div v-else>
+							<div v-else-if="translation">
 								<b>{{ i18n.t('translatedFrom', { x: translation.sourceLang }) }}: </b>
 								<Mfm :text="translation.text" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 							</div>
 						</div>
 					</div>
-					<div v-if="appearNote.files.length > 0">
+					<div v-if="appearNote.files && appearNote.files.length > 0">
 						<MkMediaList :mediaList="appearNote.files"/>
 					</div>
-					<MkPoll v-if="appearNote.poll" :note="appearNote" :class="$style.poll"/>
+					<MkPoll v-if="appearNote.poll" :noteId="appearNote.id" :poll="appearNote.poll" :class="$style.poll"/>
 					<MkUrlPreview v-for="url in urls" :key="url" :url="url" :compact="true" :detail="false" :class="$style.urlPreview"/>
 					<div v-if="appearNote.renote" :class="$style.quote"><MkNoteSimple :note="appearNote.renote" :class="$style.quoteNote"/></div>
 					<button v-if="isLong && collapsed" :class="$style.collapsed" class="_button" @click="collapsed = false">
@@ -126,7 +126,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<button v-if="defaultStore.state.showClipButtonInNoteFooter" ref="clipButton" :class="$style.footerButton" class="_button" @mousedown="clip()">
 					<i class="ti ti-paperclip"></i>
 				</button>
-				<button ref="menuButton" :class="$style.footerButton" class="_button" @mousedown="menu()">
+				<button ref="menuButton" :class="$style.footerButton" class="_button" @mousedown="showMenu()">
 					<i class="ti ti-dots"></i>
 				</button>
 			</footer>
@@ -214,7 +214,7 @@ if (noteViewInterruptors.length > 0) {
 		let result: Misskey.entities.Note | null = deepClone(note.value);
 		for (const interruptor of noteViewInterruptors) {
 			try {
-				result = await interruptor.handler(result);
+				result = await interruptor.handler(result!) as Misskey.entities.Note | null;
 				if (result === null) {
 					isDeleted.value = true;
 					return;
@@ -223,7 +223,7 @@ if (noteViewInterruptors.length > 0) {
 				console.error(err);
 			}
 		}
-		note.value = result;
+		note.value = result as Misskey.entities.Note;
 	});
 }
 
@@ -231,11 +231,11 @@ const isRenote = (
 	note.value.renote != null &&
 	note.value.text == null &&
 	note.value.cw == null &&
-	note.value.fileIds.length === 0 &&
+	note.value.fileIds && note.value.fileIds.length === 0 &&
 	note.value.poll == null
 );
 
-const el = shallowRef<HTMLElement>();
+const rootEl = shallowRef<HTMLElement>();
 const menuButton = shallowRef<HTMLElement>();
 const renoteButton = shallowRef<HTMLElement>();
 const renoteTime = shallowRef<HTMLElement>();
@@ -254,8 +254,8 @@ const hardMuted = ref(props.withHardMute && checkMute(appearNote.value, $i?.hard
 const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
 const translating = ref(false);
 const showTicker = (defaultStore.state.instanceTicker === 'always') || (defaultStore.state.instanceTicker === 'remote' && appearNote.value.user.instance);
-const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i.id));
-const renoteCollapsed = ref(defaultStore.state.collapseRenotes && isRenote && (($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) || (appearNote.value.myReaction != null)));
+const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
+const renoteCollapsed = ref(defaultStore.state.collapseRenotes && isRenote && (($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) ?? (appearNote.value.myReaction != null)));
 
 function checkMute(note: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null): boolean {
 	if (mutedWords == null) return false;
@@ -269,11 +269,11 @@ function checkMute(note: Misskey.entities.Note, mutedWords: Array<string | strin
 const keymap = {
 	'r': () => reply(true),
 	'e|a|plus': () => react(true),
-	'q': () => renoteButton.value.renote(true),
+	'q': () => renote(true),
 	'up|k|shift+tab': focusBefore,
 	'down|j|tab': focusAfter,
 	'esc': blur,
-	'm|o': () => menu(true),
+	'm|o': () => showMenu(true),
 	's': () => showContent.value !== showContent.value,
 };
 
@@ -290,7 +290,7 @@ if (props.mock) {
 	}, { deep: true });
 } else {
 	useNoteCapture({
-		rootEl: el,
+		rootEl: rootEl,
 		note: appearNote,
 		pureNote: note,
 		isDeletedRef: isDeleted,
@@ -336,7 +336,7 @@ function reply(viaKeyboard = false): void {
 		reply: appearNote.value,
 		channel: appearNote.value.channel,
 		animation: !viaKeyboard,
-	}, () => {
+	}).then(() => {
 		focus();
 	});
 }
@@ -355,7 +355,7 @@ function react(viaKeyboard = false): void {
 			noteId: appearNote.value.id,
 			reaction: '❤️',
 		});
-		const el = reactButton.value as HTMLElement | null | undefined;
+		const el = reactButton.value;
 		if (el) {
 			const rect = el.getBoundingClientRect();
 			const x = rect.left + (el.offsetWidth / 2);
@@ -364,7 +364,7 @@ function react(viaKeyboard = false): void {
 		}
 	} else {
 		blur();
-		reactionPicker.show(reactButton.value, reaction => {
+		reactionPicker.show(reactButton.value ?? null, reaction => {
 			sound.play('reaction');
 
 			if (props.mock) {
@@ -385,8 +385,8 @@ function react(viaKeyboard = false): void {
 	}
 }
 
-function undoReact(note): void {
-	const oldReaction = note.myReaction;
+function undoReact(targetNote: Misskey.entities.Note): void {
+	const oldReaction = targetNote.myReaction;
 	if (!oldReaction) return;
 
 	if (props.mock) {
@@ -395,7 +395,7 @@ function undoReact(note): void {
 	}
 
 	misskeyApi('notes/reactions/delete', {
-		noteId: note.id,
+		noteId: targetNote.id,
 	});
 }
 
@@ -404,32 +404,34 @@ function onContextmenu(ev: MouseEvent): void {
 		return;
 	}
 
-	const isLink = (el: HTMLElement) => {
+	const isLink = (el: HTMLElement): boolean => {
 		if (el.tagName === 'A') return true;
 		// 再生速度の選択などのために、Audio要素のコンテキストメニューはブラウザデフォルトとする。
 		if (el.tagName === 'AUDIO') return true;
 		if (el.parentElement) {
 			return isLink(el.parentElement);
 		}
+		return false;
 	};
-	if (isLink(ev.target)) return;
-	if (window.getSelection().toString() !== '') return;
+
+	if (ev.target && isLink(ev.target as HTMLElement)) return;
+	if (window.getSelection()?.toString() !== '') return;
 
 	if (defaultStore.state.useReactionPickerForContextMenu) {
 		ev.preventDefault();
 		react();
 	} else {
-		const { menu, cleanup } = getNoteMenu({ note: note.value, translating, translation, menuButton, isDeleted, currentClip: currentClip?.value });
+		const { menu, cleanup } = getNoteMenu({ note: note.value, translating, translation, isDeleted, currentClip: currentClip?.value });
 		os.contextMenu(menu, ev).then(focus).finally(cleanup);
 	}
 }
 
-function menu(viaKeyboard = false): void {
+function showMenu(viaKeyboard = false): void {
 	if (props.mock) {
 		return;
 	}
 
-	const { menu, cleanup } = getNoteMenu({ note: note.value, translating, translation, menuButton, isDeleted, currentClip: currentClip?.value });
+	const { menu, cleanup } = getNoteMenu({ note: note.value, translating, translation, isDeleted, currentClip: currentClip?.value });
 	os.popupMenu(menu, menuButton.value, {
 		viaKeyboard,
 	}).then(focus).finally(cleanup);
@@ -476,7 +478,7 @@ function showRenoteMenu(viaKeyboard = false): void {
 			getCopyNoteLinkMenu(note.value, i18n.ts.copyLinkRenote),
 			{ type: 'divider' },
 			getAbuseNoteMenu(note.value, i18n.ts.reportAbuseRenote),
-			$i.isModerator || $i.isAdmin ? getUnrenote() : undefined,
+			($i?.isModerator || $i?.isAdmin) ? getUnrenote() : undefined,
 		], renoteTime.value, {
 			viaKeyboard: viaKeyboard,
 		});
@@ -484,19 +486,19 @@ function showRenoteMenu(viaKeyboard = false): void {
 }
 
 function focus() {
-	el.value.focus();
+	rootEl.value?.focus();
 }
 
 function blur() {
-	el.value.blur();
+	rootEl.value?.blur();
 }
 
 function focusBefore() {
-	focusPrev(el.value);
+	focusPrev(rootEl.value ?? null);
 }
 
 function focusAfter() {
-	focusNext(el.value);
+	focusNext(rootEl.value ?? null);
 }
 
 function readPromo() {
diff --git a/packages/frontend/src/components/MkSwitch.button.vue b/packages/frontend/src/components/MkSwitch.button.vue
index a7e91acc39..14338fe4e8 100644
--- a/packages/frontend/src/components/MkSwitch.button.vue
+++ b/packages/frontend/src/components/MkSwitch.button.vue
@@ -24,7 +24,7 @@ import { i18n } from '@/i18n.js';
 
 const props = withDefaults(defineProps<{
 	checked: boolean | Ref<boolean>;
-	disabled?: boolean;
+	disabled?: boolean | Ref<boolean>;
 }>(), {
 	disabled: false,
 });
diff --git a/packages/frontend/src/scripts/get-note-menu.ts b/packages/frontend/src/scripts/get-note-menu.ts
index 110be244cb..4c0931b0ad 100644
--- a/packages/frontend/src/scripts/get-note-menu.ts
+++ b/packages/frontend/src/scripts/get-note-menu.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { defineAsyncComponent, Ref } from 'vue';
+import { defineAsyncComponent, Ref, ShallowRef } from 'vue';
 import * as Misskey from 'misskey-js';
 import { claimAchievement } from './achievements.js';
 import { $i } from '@/account.js';
@@ -36,7 +36,7 @@ export async function getNoteClipMenu(props: {
 	const appearNote = isRenote ? props.note.renote as Misskey.entities.Note : props.note;
 
 	const clips = await clipsCache.fetch();
-	return [...clips.map(clip => ({
+	const menu: MenuItem[] = [...clips.map(clip => ({
 		text: clip.name,
 		action: () => {
 			claimAchievement('noteClipped1');
@@ -93,6 +93,8 @@ export async function getNoteClipMenu(props: {
 			os.apiWithDialog('clips/add-note', { clipId: clip.id, noteId: appearNote.id });
 		},
 	}];
+
+	return menu;
 }
 
 export function getAbuseNoteMenu(note: Misskey.entities.Note, text: string): MenuItem {
@@ -122,7 +124,6 @@ export function getCopyNoteLinkMenu(note: Misskey.entities.Note, text: string):
 
 export function getNoteMenu(props: {
 	note: Misskey.entities.Note;
-	menuButton: Ref<HTMLElement>;
 	translation: Ref<Misskey.entities.NotesTranslateResponse | null>;
 	translating: Ref<boolean>;
 	isDeleted: Ref<boolean>;
@@ -471,7 +472,7 @@ function smallerVisibility(a: Visibility | string, b: Visibility | string): Visi
 
 export function getRenoteMenu(props: {
 	note: Misskey.entities.Note;
-	renoteButton: Ref<HTMLElement>;
+	renoteButton: ShallowRef<HTMLElement | undefined>;
 	mock?: boolean;
 }) {
 	const isRenote = (
@@ -491,7 +492,7 @@ export function getRenoteMenu(props: {
 			text: i18n.ts.inChannelRenote,
 			icon: 'ti ti-repeat',
 			action: () => {
-				const el = props.renoteButton.value as HTMLElement | null | undefined;
+				const el = props.renoteButton.value;
 				if (el) {
 					const rect = el.getBoundingClientRect();
 					const x = rect.left + (el.offsetWidth / 2);
@@ -527,7 +528,7 @@ export function getRenoteMenu(props: {
 			text: i18n.ts.renote,
 			icon: 'ti ti-repeat',
 			action: () => {
-				const el = props.renoteButton.value as HTMLElement | null | undefined;
+				const el = props.renoteButton.value;
 				if (el) {
 					const rect = el.getBoundingClientRect();
 					const x = rect.left + (el.offsetWidth / 2);
@@ -567,7 +568,7 @@ export function getRenoteMenu(props: {
 
 	const renoteItems = [
 		...normalRenoteItems,
-		...(channelRenoteItems.length > 0 && normalRenoteItems.length > 0) ? [{ type: 'divider' }] : [],
+		...(channelRenoteItems.length > 0 && normalRenoteItems.length > 0) ? [{ type: 'divider' }] as MenuItem[] : [],
 		...channelRenoteItems,
 	];
 
diff --git a/packages/frontend/src/scripts/reaction-picker.ts b/packages/frontend/src/scripts/reaction-picker.ts
index 9b13e794f5..a13351b536 100644
--- a/packages/frontend/src/scripts/reaction-picker.ts
+++ b/packages/frontend/src/scripts/reaction-picker.ts
@@ -38,7 +38,7 @@ class ReactionPicker {
 		});
 	}
 
-	public show(src: HTMLElement, onChosen?: ReactionPicker['onChosen'], onClosed?: ReactionPicker['onClosed']) {
+	public show(src: HTMLElement | null, onChosen?: ReactionPicker['onChosen'], onClosed?: ReactionPicker['onClosed']) {
 		this.src.value = src;
 		this.manualShowing.value = true;
 		this.onChosen = onChosen;
diff --git a/packages/frontend/src/scripts/use-note-capture.ts b/packages/frontend/src/scripts/use-note-capture.ts
index bda9c04ea4..d4e7e8104f 100644
--- a/packages/frontend/src/scripts/use-note-capture.ts
+++ b/packages/frontend/src/scripts/use-note-capture.ts
@@ -3,13 +3,13 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { onUnmounted, Ref } from 'vue';
+import { onUnmounted, Ref, ShallowRef } from 'vue';
 import * as Misskey from 'misskey-js';
 import { useStream } from '@/stream.js';
 import { $i } from '@/account.js';
 
 export function useNoteCapture(props: {
-	rootEl: Ref<HTMLElement>;
+	rootEl: ShallowRef<HTMLElement | undefined>;
 	note: Ref<Misskey.entities.Note>;
 	pureNote: Ref<Misskey.entities.Note>;
 	isDeletedRef: Ref<boolean>;
@@ -83,7 +83,7 @@ export function useNoteCapture(props: {
 	function capture(withHandler = false): void {
 		if (connection) {
 			// TODO: このノートがストリーミング経由で流れてきた場合のみ sr する
-			connection.send(document.body.contains(props.rootEl.value) ? 'sr' : 's', { id: note.value.id });
+			connection.send(document.body.contains(props.rootEl.value ?? null as Node | null) ? 'sr' : 's', { id: note.value.id });
 			if (pureNote.value.id !== note.value.id) connection.send('s', { id: pureNote.value.id });
 			if (withHandler) connection.on('noteUpdated', onStreamNoteUpdated);
 		}