diff --git a/packages/client/src/components/autocomplete.vue b/packages/client/src/components/autocomplete.vue
index 91a50ffa5..d5bca25c5 100644
--- a/packages/client/src/components/autocomplete.vue
+++ b/packages/client/src/components/autocomplete.vue
@@ -57,7 +57,7 @@ const lib = emojilist.filter(x => x.category !== 'flags');
 
 const char2file = (char: string) => {
 	let codes = Array.from(char).map(x => x.codePointAt(0)?.toString(16));
-	if (!codes.includes('200d')) codes = codes.filter(x => x != 'fe0f');
+	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
 	return codes.filter(x => x && x.length).join('-');
 };
 
@@ -208,7 +208,7 @@ function exec() {
 			});
 		}
 	} else if (props.type === 'hashtag') {
-		if (!props.q || props.q == '') {
+		if (!props.q || props.q === '') {
 			hashtags.value = JSON.parse(localStorage.getItem('hashtags') || '[]');
 			fetching.value = false;
 		} else {
@@ -231,7 +231,7 @@ function exec() {
 			}
 		}
 	} else if (props.type === 'emoji') {
-		if (!props.q || props.q == '') {
+		if (!props.q || props.q === '') {
 			// 最近使った絵文字をサジェスト
 			emojis.value = defaultStore.state.recentlyUsedEmojis.map(emoji => emojiDb.find(e => e.emoji == emoji)).filter(x => x) as EmojiDef[];
 			return;
@@ -241,37 +241,37 @@ function exec() {
 		const max = 30;
 
 		emojiDb.some(x => {
-			if (x.name.startsWith(props.q || '') && !x.aliasOf && !matched.some(y => y.emoji == x.emoji)) matched.push(x);
-			return matched.length == max;
+			if (x.name.startsWith(props.q ?? '') && !x.aliasOf && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
+			return matched.length === max;
 		});
 
 		if (matched.length < max) {
 			emojiDb.some(x => {
-				if (x.name.startsWith(props.q || '') && !matched.some(y => y.emoji == x.emoji)) matched.push(x);
-				return matched.length == max;
+				if (x.name.startsWith(props.q ?? '') && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
+				return matched.length === max;
 			});
 		}
 
 		if (matched.length < max) {
 			emojiDb.some(x => {
-				if (x.name.includes(props.q || '') && !matched.some(y => y.emoji == x.emoji)) matched.push(x);
-				return matched.length == max;
+				if (x.name.includes(props.q ?? '') && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
+				return matched.length === max;
 			});
 		}
 
 		emojis.value = matched;
 	} else if (props.type === 'mfmTag') {
-		if (!props.q || props.q == '') {
+		if (!props.q || props.q === '') {
 			mfmTags.value = MFM_TAGS;
 			return;
 		}
 
-		mfmTags.value = MFM_TAGS.filter(tag => tag.startsWith(props.q || ''));
+		mfmTags.value = MFM_TAGS.filter(tag => tag.startsWith(props.q ?? ''));
 	}
 }
 
 function onMousedown(e: Event) {
-	if (!contains(rootEl.value, e.target) && (rootEl.value != e.target)) props.close();
+	if (!contains(rootEl.value, e.target) && (rootEl.value !== e.target)) props.close();
 }
 
 function onKeydown(e: KeyboardEvent) {
@@ -348,7 +348,7 @@ function chooseUser() {
 
 onUpdated(() => {
 	setPosition();
-	items.value = suggests.value?.children || [];
+	items.value = suggests.value?.children ?? [];
 });
 
 onMounted(() => {
diff --git a/packages/client/src/components/captcha.vue b/packages/client/src/components/captcha.vue
index 963ae25f8..ccd8880df 100644
--- a/packages/client/src/components/captcha.vue
+++ b/packages/client/src/components/captcha.vue
@@ -93,7 +93,7 @@ function requestRender() {
 }
 
 function callback(response?: string) {
-	emit('update:modelValue', typeof response == 'string' ? response : null);
+	emit('update:modelValue', typeof response === 'string' ? response : null);
 }
 
 onMounted(() => {
diff --git a/packages/client/src/components/date-separated-list.vue b/packages/client/src/components/date-separated-list.vue
index c85a0a6ff..085ef871e 100644
--- a/packages/client/src/components/date-separated-list.vue
+++ b/packages/client/src/components/date-separated-list.vue
@@ -53,8 +53,8 @@ export default defineComponent({
 			if (el.key == null && item.id) el.key = item.id;
 
 			if (
-				i != props.items.length - 1 &&
-				new Date(item.createdAt).getDate() != new Date(props.items[i + 1].createdAt).getDate()
+				i !== props.items.length - 1 &&
+				new Date(item.createdAt).getDate() !== new Date(props.items[i + 1].createdAt).getDate()
 			) {
 				const separator = h('div', {
 					class: 'separator',
diff --git a/packages/client/src/components/mfm.ts b/packages/client/src/components/mfm.ts
index 2e6d26476..37076652f 100644
--- a/packages/client/src/components/mfm.ts
+++ b/packages/client/src/components/mfm.ts
@@ -45,7 +45,7 @@ export default defineComponent({
 	},
 
 	render() {
-		if (this.text == null || this.text == '') return;
+		if (this.text == null || this.text === '') return;
 
 		const ast = (this.plain ? mfm.parsePlain : mfm.parse)(this.text, { fnNameList: MFM_TAGS });
 
diff --git a/packages/client/src/components/notification-toast.vue b/packages/client/src/components/notification-toast.vue
index b2ab1029a..4c5783e52 100644
--- a/packages/client/src/components/notification-toast.vue
+++ b/packages/client/src/components/notification-toast.vue
@@ -6,33 +6,26 @@
 </div>
 </template>
 
-<script lang="ts">
-import { defineComponent } from 'vue';
+<script lang="ts" setup>
+import { onMounted } from 'vue';
 import XNotification from './notification.vue';
 import * as os from '@/os';
 
-export default defineComponent({
-	components: {
-		XNotification
-	},
-	props: {
-		notification: {
-			type: Object,
-			required: true
-		}
-	},
-	emits: ['closed'],
-	data() {
-		return {
-			showing: true,
-			zIndex: os.claimZIndex('high'),
-		};
-	},
-	mounted() {
-		window.setTimeout(() => {
-			this.showing = false;
-		}, 6000);
-	}
+defineProps<{
+	notification: any; // TODO
+}>();
+
+const emit = defineEmits<{
+	(ev: 'closed'): void;
+}>();
+
+const zIndex = os.claimZIndex('high');
+let showing = $ref(true);
+
+onMounted(() => {
+	window.setTimeout(() => {
+		showing = false;
+	}, 6000);
 });
 </script>
 
diff --git a/packages/client/src/components/toast.vue b/packages/client/src/components/toast.vue
index c11437971..99933f384 100644
--- a/packages/client/src/components/toast.vue
+++ b/packages/client/src/components/toast.vue
@@ -22,12 +22,12 @@ const emit = defineEmits<{
 	(e: 'closed'): void;
 }>();
 
-const showing = ref(true);
 const zIndex = os.claimZIndex('high');
+let showing = $ref(true);
 
 onMounted(() => {
 	window.setTimeout(() => {
-		showing.value = false;
+		showing = false;
 	}, 4000);
 });
 </script>
diff --git a/packages/client/src/components/url-preview.vue b/packages/client/src/components/url-preview.vue
index 6c5795761..c7bbd1fbd 100644
--- a/packages/client/src/components/url-preview.vue
+++ b/packages/client/src/components/url-preview.vue
@@ -67,7 +67,7 @@ let tweetHeight = $ref(150);
 
 const requestUrl = new URL(props.url);
 
-if (requestUrl.hostname == 'twitter.com') {
+if (requestUrl.hostname === 'twitter.com') {
 	const m = requestUrl.pathname.match(/^\/.+\/status(?:es)?\/(\d+)/);
 	if (m) tweetId = m[1];
 }
diff --git a/packages/client/src/os.ts b/packages/client/src/os.ts
index 95b4e87a1..5f1fb1ef9 100644
--- a/packages/client/src/os.ts
+++ b/packages/client/src/os.ts
@@ -544,7 +544,7 @@ export const uploads = ref<{
 }[]>([]);
 
 export function upload(file: File, folder?: any, name?: string, keepOriginal: boolean = defaultStore.state.keepOriginalUploading): Promise<Misskey.entities.DriveFile> {
-	if (folder && typeof folder == 'object') folder = folder.id;
+	if (folder && typeof folder === 'object') folder = folder.id;
 
 	return new Promise((resolve, reject) => {
 		const id = Math.random().toString();
diff --git a/packages/client/src/pages/settings/theme.vue b/packages/client/src/pages/settings/theme.vue
index 3e4ec1b2a..72b7e6917 100644
--- a/packages/client/src/pages/settings/theme.vue
+++ b/packages/client/src/pages/settings/theme.vue
@@ -123,8 +123,8 @@ export default defineComponent({
 
 		const installedThemes = ref(getThemes());
 		const themes = computed(() => builtinThemes.concat(installedThemes.value));
-		const darkThemes = computed(() => themes.value.filter(t => t.base == 'dark' || t.kind == 'dark'));
-		const lightThemes = computed(() => themes.value.filter(t => t.base == 'light' || t.kind == 'light'));
+		const darkThemes = computed(() => themes.value.filter(t => t.base === 'dark' || t.kind === 'dark'));
+		const lightThemes = computed(() => themes.value.filter(t => t.base === 'light' || t.kind === 'light'));
 		const darkTheme = ColdDeviceStorage.ref('darkTheme');
 		const darkThemeId = computed({
 			get() {