diff --git a/packages/frontend/src/components/MkChartTooltip.vue b/packages/frontend/src/components/MkChartTooltip.vue
index 51081ede23..b9d2c8219a 100644
--- a/packages/frontend/src/components/MkChartTooltip.vue
+++ b/packages/frontend/src/components/MkChartTooltip.vue
@@ -25,12 +25,12 @@ defineProps<{
 	showing: boolean;
 	x: number;
 	y: number;
-	title?: string;
+	title?: string | null;
 	series?: {
 		backgroundColor: string;
 		borderColor: string;
 		text: string;
-	}[];
+	}[] | null;
 }>();
 
 const emit = defineEmits<{
diff --git a/packages/frontend/src/components/page/page.image.vue b/packages/frontend/src/components/page/page.image.vue
index 69443ce7dd..7e8d8f7bfb 100644
--- a/packages/frontend/src/components/page/page.image.vue
+++ b/packages/frontend/src/components/page/page.image.vue
@@ -15,7 +15,7 @@ import * as Misskey from 'misskey-js';
 import MkMediaList from '@/components/MkMediaList.vue';
 
 const props = defineProps<{
-	block: Misskey.entities.PageBlock,
+	block: Extract<Misskey.entities.PageBlock, { type: 'image' }>,
 	page: Misskey.entities.Page,
 }>();
 
diff --git a/packages/frontend/src/components/page/page.note.vue b/packages/frontend/src/components/page/page.note.vue
index df26874c17..bae05b9765 100644
--- a/packages/frontend/src/components/page/page.note.vue
+++ b/packages/frontend/src/components/page/page.note.vue
@@ -18,7 +18,7 @@ import MkNoteDetailed from '@/components/MkNoteDetailed.vue';
 import { misskeyApi } from '@/utility/misskey-api.js';
 
 const props = defineProps<{
-	block: Misskey.entities.PageBlock,
+	block: Extract<Misskey.entities.PageBlock, { type: 'note' }>,
 	page: Misskey.entities.Page,
 }>();
 
diff --git a/packages/frontend/src/components/page/page.section.vue b/packages/frontend/src/components/page/page.section.vue
index e3d26d924f..05c12b3b83 100644
--- a/packages/frontend/src/components/page/page.section.vue
+++ b/packages/frontend/src/components/page/page.section.vue
@@ -29,7 +29,7 @@ import * as Misskey from 'misskey-js';
 const XBlock = defineAsyncComponent(() => import('./page.block.vue'));
 
 defineProps<{
-	block: Misskey.entities.PageBlock,
+	block: Extract<Misskey.entities.PageBlock, { type: 'section' }>,
 	h: number,
 	page: Misskey.entities.Page,
 }>();
diff --git a/packages/frontend/src/components/page/page.text.vue b/packages/frontend/src/components/page/page.text.vue
index a00eb0b5ca..792f6529d8 100644
--- a/packages/frontend/src/components/page/page.text.vue
+++ b/packages/frontend/src/components/page/page.text.vue
@@ -22,7 +22,7 @@ import { isEnabledUrlPreview } from '@/utility/url-preview.js';
 const MkUrlPreview = defineAsyncComponent(() => import('@/components/MkUrlPreview.vue'));
 
 const props = defineProps<{
-	block: Misskey.entities.PageBlock,
+	block: Extract<Misskey.entities.PageBlock, { type: 'text' }>,
 	page: Misskey.entities.Page,
 }>();
 
diff --git a/packages/frontend/src/instance.ts b/packages/frontend/src/instance.ts
index a5397f0c0d..c9d83a4dbe 100644
--- a/packages/frontend/src/instance.ts
+++ b/packages/frontend/src/instance.ts
@@ -51,3 +51,9 @@ export async function fetchInstance(force = false): Promise<Misskey.entities.Met
 
 	return instance;
 }
+
+export type ClientOptions = {
+	entrancePageStyle: 'classic' | 'simple';
+	showTimelineForVisitor: boolean;
+	showActivitiesForVisitor: boolean;
+};
diff --git a/packages/frontend/src/pages/admin/branding.vue b/packages/frontend/src/pages/admin/branding.vue
index f78a4f27bd..e5e0f087e1 100644
--- a/packages/frontend/src/pages/admin/branding.vue
+++ b/packages/frontend/src/pages/admin/branding.vue
@@ -152,6 +152,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { ref, computed } from 'vue';
 import JSON5 from 'json5';
 import { host } from '@@/js/config.js';
+import type { ClientOptions } from '@/instance.js';
 import MkInput from '@/components/MkInput.vue';
 import MkTextarea from '@/components/MkTextarea.vue';
 import * as os from '@/os.js';
@@ -166,9 +167,13 @@ import MkSwitch from '@/components/MkSwitch.vue';
 
 const meta = await misskeyApi('admin/meta');
 
-const entrancePageStyle = ref(meta.clientOptions.entrancePageStyle ?? 'classic');
-const showTimelineForVisitor = ref(meta.clientOptions.showTimelineForVisitor ?? true);
-const showActivitiesForVisitor = ref(meta.clientOptions.showActivitiesForVisitor ?? true);
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+const entrancePageStyle = ref<ClientOptions['entrancePageStyle']>(meta.clientOptions.entrancePageStyle ?? 'classic');
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+const showTimelineForVisitor = ref<ClientOptions['showTimelineForVisitor']>(meta.clientOptions.showTimelineForVisitor ?? true);
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+const showActivitiesForVisitor = ref<ClientOptions['showActivitiesForVisitor']>(meta.clientOptions.showActivitiesForVisitor ?? true);
+
 const iconUrl = ref(meta.iconUrl);
 const app192IconUrl = ref(meta.app192IconUrl);
 const app512IconUrl = ref(meta.app512IconUrl);
@@ -186,11 +191,11 @@ const manifestJsonOverride = ref(meta.manifestJsonOverride === '' ? '{}' : JSON.
 
 function save() {
 	os.apiWithDialog('admin/update-meta', {
-		clientOptions: {
+		clientOptions: ({
 			entrancePageStyle: entrancePageStyle.value,
 			showTimelineForVisitor: showTimelineForVisitor.value,
 			showActivitiesForVisitor: showActivitiesForVisitor.value,
-		},
+		} as ClientOptions) as any,
 		iconUrl: iconUrl.value,
 		app192IconUrl: app192IconUrl.value,
 		app512IconUrl: app512IconUrl.value,
diff --git a/packages/frontend/src/pages/admin/email-settings.vue b/packages/frontend/src/pages/admin/email-settings.vue
index 8eb403f94c..340391a12f 100644
--- a/packages/frontend/src/pages/admin/email-settings.vue
+++ b/packages/frontend/src/pages/admin/email-settings.vue
@@ -107,7 +107,7 @@ const smtpPass = ref(meta.smtpPass);
 
 async function testEmail() {
 	const { canceled, result: destination } = await os.inputText({
-		title: i18n.ts.destination,
+		title: 'To',
 		type: 'email',
 		default: instance.maintainerEmail ?? '',
 		placeholder: 'test@example.com',
diff --git a/packages/frontend/src/pages/admin/federation-job-queue.chart.vue b/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
index b17eceadde..d449801985 100644
--- a/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
+++ b/packages/frontend/src/pages/admin/federation-job-queue.chart.vue
@@ -81,10 +81,10 @@ function onStats(stats: Misskey.entities.QueueStats) {
 	delayed.value = stats[props.domain].delayed;
 	waiting.value = stats[props.domain].waiting;
 
-	chartProcess.value.pushData(stats[props.domain].activeSincePrevTick);
-	chartActive.value.pushData(stats[props.domain].active);
-	chartDelayed.value.pushData(stats[props.domain].delayed);
-	chartWaiting.value.pushData(stats[props.domain].waiting);
+	if (chartProcess.value != null) chartProcess.value.pushData(stats[props.domain].activeSincePrevTick);
+	if (chartActive.value != null) chartActive.value.pushData(stats[props.domain].active);
+	if (chartDelayed.value != null) chartDelayed.value.pushData(stats[props.domain].delayed);
+	if (chartWaiting.value != null) chartWaiting.value.pushData(stats[props.domain].waiting);
 }
 
 function onStatsLog(statsLog: Misskey.entities.QueueStatsLog) {
@@ -100,10 +100,10 @@ function onStatsLog(statsLog: Misskey.entities.QueueStatsLog) {
 		dataWaiting.push(stats[props.domain].waiting);
 	}
 
-	chartProcess.value.setData(dataProcess);
-	chartActive.value.setData(dataActive);
-	chartDelayed.value.setData(dataDelayed);
-	chartWaiting.value.setData(dataWaiting);
+	if (chartProcess.value != null) chartProcess.value.setData(dataProcess);
+	if (chartActive.value != null) chartActive.value.setData(dataActive);
+	if (chartDelayed.value != null) chartDelayed.value.setData(dataDelayed);
+	if (chartWaiting.value != null) chartWaiting.value.setData(dataWaiting);
 }
 
 onMounted(() => {
diff --git a/packages/frontend/src/pages/emoji-edit-dialog.vue b/packages/frontend/src/pages/emoji-edit-dialog.vue
index 201ce003f0..033e3376a5 100644
--- a/packages/frontend/src/pages/emoji-edit-dialog.vue
+++ b/packages/frontend/src/pages/emoji-edit-dialog.vue
@@ -36,7 +36,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkInput v-model="name" pattern="[a-z0-9_]" autocapitalize="off">
 					<template #label>{{ i18n.ts.name }}</template>
 				</MkInput>
-				<MkInput v-model="category" :datalist="customEmojiCategories">
+				<MkInput v-model="category" :datalist="customEmojiCategories.filter(x => x != null)">
 					<template #label>{{ i18n.ts.category }}</template>
 				</MkInput>
 				<MkInput v-model="aliases" autocapitalize="off">
diff --git a/packages/frontend/src/pages/settings/2fa.qrdialog.vue b/packages/frontend/src/pages/settings/2fa.qrdialog.vue
index 5bb125e67c..780040f699 100644
--- a/packages/frontend/src/pages/settings/2fa.qrdialog.vue
+++ b/packages/frontend/src/pages/settings/2fa.qrdialog.vue
@@ -135,7 +135,7 @@ const emit = defineEmits<{
 
 const dialog = useTemplateRef('dialog');
 const page = ref(0);
-const token = ref<string | number | null>(null);
+const token = ref<string | null>(null);
 const backupCodes = ref<string[]>();
 
 function cancel() {
@@ -145,7 +145,7 @@ function cancel() {
 async function tokenDone() {
 	if (token.value == null) return;
 	const res = await os.apiWithDialog('i/2fa/done', {
-		token: typeof token.value === 'string' ? token.value : token.value.toString(),
+		token: token.value.toString(), // 実装ミスなどでnumberが入る可能性を払拭できないため念のためtoString
 	});
 
 	backupCodes.value = res.backupCodes;
diff --git a/packages/frontend/src/pages/settings/statusbar.vue b/packages/frontend/src/pages/settings/statusbar.vue
index 2db9f7e6f9..1d0fadabd7 100644
--- a/packages/frontend/src/pages/settings/statusbar.vue
+++ b/packages/frontend/src/pages/settings/statusbar.vue
@@ -17,8 +17,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { onMounted, ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';
-import { genId } from '@/utility/id.js';
 import XStatusbar from './statusbar.statusbar.vue';
+import { genId } from '@/utility/id.js';
 import MkFolder from '@/components/MkFolder.vue';
 import MkButton from '@/components/MkButton.vue';
 import { misskeyApi } from '@/utility/misskey-api.js';
@@ -39,6 +39,7 @@ onMounted(() => {
 async function add() {
 	prefer.commit('statusbars', [...statusbars.value, {
 		id: genId(),
+		name: null,
 		type: null,
 		black: false,
 		size: 'medium',
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index 702d9a4acf..414aa34753 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -32,6 +32,15 @@ export type SoundStore = {
 	volume: number;
 };
 
+export type StatusbarStore = {
+	name: string | null;
+	id: string;
+	type: string | null;
+	size: 'verySmall' | 'small' | 'medium' | 'large' | 'veryLarge';
+	black: boolean;
+	props: Record<string, any>;
+};
+
 type OmitStrict<T, K extends keyof T> = T extends any ? Pick<T, Exclude<keyof T, K>> : never;
 
 // NOTE: デフォルト値は他の設定の状態に依存してはならない(依存していた場合、ユーザーがその設定項目単体で「初期値にリセット」した場合不具合の原因になる)
@@ -182,14 +191,7 @@ export const PREF_DEF = definePreferences({
 		],
 	},
 	statusbars: {
-		default: [] as {
-			name: string;
-			id: string;
-			type: string;
-			size: 'verySmall' | 'small' | 'medium' | 'large' | 'veryLarge';
-			black: boolean;
-			props: Record<string, any>;
-		}[],
+		default: [] as StatusbarStore[],
 	},
 	serverDisconnectedBehavior: {
 		default: 'quiet' as 'quiet' | 'reload' | 'dialog',