diff --git a/packages/client/@types/global.d.ts b/packages/client/@types/global.d.ts
index c757482900..3ac4f09b0c 100644
--- a/packages/client/@types/global.d.ts
+++ b/packages/client/@types/global.d.ts
@@ -1,3 +1,4 @@
+// biome-ignore lint/suspicious/noExplicitAny:
 type FIXME = any;
 
 declare const _LANGS_: string[][];
diff --git a/packages/client/src/components/MkNoteSub.vue b/packages/client/src/components/MkNoteSub.vue
index 08c0bf6c38..c7cf06d2e5 100644
--- a/packages/client/src/components/MkNoteSub.vue
+++ b/packages/client/src/components/MkNoteSub.vue
@@ -1,7 +1,7 @@
 <template>
 	<article
 		v-if="!muted.muted || muted.what === 'reply'"
-		:id="detailedView ? appearNote.id : null"
+		:id="detailedView ? appearNote.id : undefined"
 		ref="el"
 		v-size="{ max: [450, 500] }"
 		class="wrpstxzv"
@@ -35,10 +35,10 @@
 						:parent-id="parentId"
 						:conversation="conversation"
 						:detailed-view="detailedView"
-						@focusfooter="footerEl.focus()"
+						@focusfooter="footerEl!.focus()"
 					/>
 					<div v-if="translating || translation" class="translation">
-						<MkLoading v-if="translating" mini />
+						<MkLoading v-if="translating || translation == null" mini />
 						<div v-else class="translated">
 							<b
 								>{{
@@ -217,6 +217,7 @@ import { useNoteCapture } from "@/scripts/use-note-capture";
 import { defaultStore } from "@/store";
 import { deepClone } from "@/scripts/clone";
 import icon from "@/scripts/icon";
+import type { NoteTranslation } from "@/types/note";
 
 const router = useRouter();
 
@@ -256,12 +257,12 @@ const isRenote =
 	note.value.fileIds.length === 0 &&
 	note.value.poll == null;
 
-const el = ref<HTMLElement>();
-const footerEl = ref<HTMLElement>();
+const el = ref<HTMLElement | null>(null);
+const footerEl = ref<HTMLElement | null>(null);
 const menuButton = ref<HTMLElement>();
-const starButton = ref<InstanceType<typeof XStarButton>>();
-const renoteButton = ref<InstanceType<typeof XRenoteButton>>();
-const reactButton = ref<HTMLElement>();
+const starButton = ref<InstanceType<typeof XStarButton> | null>(null);
+const renoteButton = ref<InstanceType<typeof XRenoteButton> | null>(null);
+const reactButton = ref<HTMLElement | null>(null);
 const appearNote = computed(() =>
 	isRenote ? (note.value.renote as entities.Note) : note.value,
 );
@@ -274,7 +275,7 @@ const muted = ref(
 		defaultStore.state.mutedLangs,
 	),
 );
-const translation = ref(null);
+const translation = ref<NoteTranslation | null>(null);
 const translating = ref(false);
 const replies: entities.Note[] =
 	props.conversation
@@ -330,21 +331,21 @@ useNoteCapture({
 	isDeletedRef: isDeleted,
 });
 
-function reply(viaKeyboard = false): void {
+function reply(_viaKeyboard = false): void {
 	pleaseLogin();
 	os.post({
 		reply: appearNote.value,
-		animation: !viaKeyboard,
+		// animation: !viaKeyboard,
 	}).then(() => {
 		focus();
 	});
 }
 
-function react(viaKeyboard = false): void {
+function react(_viaKeyboard = false): void {
 	pleaseLogin();
 	blur();
 	reactionPicker.show(
-		reactButton.value,
+		reactButton.value!,
 		(reaction) => {
 			os.api("notes/reactions/create", {
 				noteId: appearNote.value.id,
@@ -388,14 +389,15 @@ function menu(viaKeyboard = false): void {
 }
 
 function onContextmenu(ev: MouseEvent): void {
-	const isLink = (el: HTMLElement) => {
+	const isLink = (el: HTMLElement | null) => {
+		if (el == null) return;
 		if (el.tagName === "A") return true;
 		if (el.parentElement) {
 			return isLink(el.parentElement);
 		}
 	};
-	if (isLink(ev.target)) return;
-	if (window.getSelection().toString() !== "") return;
+	if (isLink(ev.target as HTMLElement | null)) return;
+	if (window.getSelection()?.toString() !== "") return;
 
 	if (defaultStore.state.useReactionPickerForContextMenu) {
 		ev.preventDefault();
@@ -454,15 +456,15 @@ function onContextmenu(ev: MouseEvent): void {
 }
 
 function focus() {
-	el.value.focus();
+	el.value!.focus();
 }
 
 function blur() {
-	el.value.blur();
+	el.value!.blur();
 }
 
-function noteClick(e) {
-	if (document.getSelection().type === "Range" || !expandOnNoteClick) {
+function noteClick(e: MouseEvent) {
+	if (document.getSelection()?.type === "Range" || !expandOnNoteClick) {
 		e.stopPropagation();
 	} else {
 		router.push(notePage(props.note));
diff --git a/packages/client/src/components/MkPollEditor.vue b/packages/client/src/components/MkPollEditor.vue
index b05f80fafa..f9dfcf80a8 100644
--- a/packages/client/src/components/MkPollEditor.vue
+++ b/packages/client/src/components/MkPollEditor.vue
@@ -84,14 +84,10 @@ import { formatDateTimeString } from "@/scripts/format-time-string";
 import { addTime } from "@/scripts/time";
 import { i18n } from "@/i18n";
 import icon from "@/scripts/icon";
+import type { PollType } from "@/types/post-form";
 
 const props = defineProps<{
-	modelValue: {
-		expiresAt: string;
-		expiredAfter: number;
-		choices: string[];
-		multiple: boolean;
-	};
+	modelValue: PollType;
 }>();
 const emit = defineEmits<{
 	"update:modelValue": [
diff --git a/packages/client/src/components/MkPostForm.vue b/packages/client/src/components/MkPostForm.vue
index 2735eb55a3..0a03dbb30e 100644
--- a/packages/client/src/components/MkPostForm.vue
+++ b/packages/client/src/components/MkPostForm.vue
@@ -20,7 +20,7 @@
 				class="account _button"
 				@click="openAccountMenu"
 			>
-				<MkAvatar :user="postAccount ?? me" class="avatar" />
+				<MkAvatar :user="postAccount ?? me!" class="avatar" />
 			</button>
 			<div class="right">
 				<span
@@ -297,14 +297,22 @@
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, nextTick, onMounted, ref, watch } from "vue";
+import {
+	type Ref,
+	computed,
+	inject,
+	nextTick,
+	onMounted,
+	ref,
+	watch,
+} from "vue";
 import * as mfm from "mfm-js";
 import autosize from "autosize";
 import insertTextAtCursor from "insert-text-at-cursor";
 import { length } from "stringz";
 import { toASCII } from "punycode/";
 import { acct } from "firefish-js";
-import type { entities, languages } from "firefish-js";
+import type { ApiTypes, entities, languages } from "firefish-js";
 import { throttle } from "throttle-debounce";
 import XNoteSimple from "@/components/MkNoteSimple.vue";
 import XNotePreview from "@/components/MkNotePreview.vue";
@@ -341,6 +349,7 @@ import type { MenuItem } from "@/types/menu";
 import icon from "@/scripts/icon";
 import MkVisibilityPicker from "@/components/MkVisibilityPicker.vue";
 import type { NoteVisibility } from "@/types/note";
+import type { NoteDraft, PollType } from "@/types/post-form";
 
 const modal = inject("modal");
 
@@ -353,11 +362,11 @@ const props = withDefaults(
 		specified?: entities.User;
 		initialText?: string;
 		initialVisibility?: NoteVisibility;
-		initialLanguage?: typeof languages;
+		initialLanguage?: (typeof languages)[number];
 		initialFiles?: entities.DriveFile[];
 		initialLocalOnly?: boolean;
 		initialVisibleUsers?: entities.User[];
-		initialNote?: entities.Note;
+		initialNote?: NoteDraft;
 		instant?: boolean;
 		fixed?: boolean;
 		autofocus?: boolean;
@@ -390,12 +399,7 @@ const showBigPostButton = defaultStore.state.showBigPostButton;
 const posting = ref(false);
 const text = ref(props.initialText ?? "");
 const files = ref(props.initialFiles ?? ([] as entities.DriveFile[]));
-const poll = ref<{
-	choices: string[];
-	multiple: boolean;
-	expiresAt: string | null;
-	expiredAfter: string | null;
-} | null>(null);
+const poll = ref<PollType | null>(null);
 const useCw = ref(false);
 const showPreview = ref(defaultStore.state.showPreviewByDefault);
 const cw = ref<string | null>(null);
@@ -411,12 +415,12 @@ const visibility = ref(
 			: defaultStore.state.defaultNoteVisibility),
 );
 
-const visibleUsers = ref([]);
+const visibleUsers = ref<entities.User[]>([]);
 if (props.initialVisibleUsers) {
 	props.initialVisibleUsers.forEach(pushVisibleUser);
 }
 const draghover = ref(false);
-const quoteId = ref(null);
+const quoteId = ref<string | null>(null);
 const hasNotSpecifiedMentions = ref(false);
 const recentHashtags = ref(
 	JSON.parse(localStorage.getItem("hashtags") || "[]"),
@@ -500,7 +504,9 @@ const canPost = computed((): boolean => {
 const withHashtags = computed(
 	defaultStore.makeGetterSetter("postFormWithHashtags"),
 );
-const hashtags = computed(defaultStore.makeGetterSetter("postFormHashtags"));
+const hashtags = computed(
+	defaultStore.makeGetterSetter("postFormHashtags"),
+) as Ref<string | null>;
 
 watch(text, () => {
 	checkMissingMention();
@@ -525,7 +531,7 @@ if (props.mention) {
 
 if (
 	props.reply &&
-	(props.reply.user.username !== me.username ||
+	(props.reply.user.username !== me!.username ||
 		(props.reply.user.host != null && props.reply.user.host !== host))
 ) {
 	text.value = `@${props.reply.user.username}${
@@ -545,7 +551,7 @@ if (props.reply && props.reply.text != null) {
 				: `@${x.username}@${toASCII(otherHost)}`;
 
 		// exclude me
-		if (me.username === x.username && (x.host == null || x.host === host))
+		if (me!.username === x.username && (x.host == null || x.host === host))
 			continue;
 
 		// remove duplicates
@@ -579,7 +585,7 @@ if (
 		if (props.reply.visibleUserIds) {
 			os.api("users/show", {
 				userIds: props.reply.visibleUserIds.filter(
-					(uid) => uid !== me.id && uid !== props.reply.userId,
+					(uid) => uid !== me!.id && uid !== props.reply!.userId,
 				),
 			}).then((users) => {
 				users.forEach(pushVisibleUser);
@@ -588,7 +594,7 @@ if (
 			visibility.value = "private";
 		}
 
-		if (props.reply.userId !== me.id) {
+		if (props.reply.userId !== me!.id) {
 			os.api("users/show", { userId: props.reply.userId }).then((user) => {
 				pushVisibleUser(user);
 			});
@@ -615,7 +621,7 @@ const addRe = (s: string) => {
 if (defaultStore.state.keepCw && props.reply && props.reply.cw) {
 	useCw.value = true;
 	cw.value =
-		props.reply.user.username === me.username
+		props.reply.user.username === me!.username
 			? props.reply.cw
 			: addRe(props.reply.cw);
 }
@@ -894,11 +900,14 @@ function onCompositionEnd(ev: CompositionEvent) {
 }
 
 async function onPaste(ev: ClipboardEvent) {
+	if (ev.clipboardData == null) return;
+
 	for (const { item, i } of Array.from(ev.clipboardData.items).map(
 		(item, i) => ({ item, i }),
 	)) {
 		if (item.kind === "file") {
 			const file = item.getAsFile();
+			if (file == null) continue;
 			const lio = file.name.lastIndexOf(".");
 			const ext = lio >= 0 ? file.name.slice(lio) : "";
 			const formatted = `${formatTimeString(
@@ -911,7 +920,7 @@ async function onPaste(ev: ClipboardEvent) {
 
 	const paste = ev.clipboardData?.getData("text") ?? "";
 
-	if (!props.renote && !quoteId.value && paste.startsWith(url + "/notes/")) {
+	if (!props.renote && !quoteId.value && paste.startsWith(`${url}/notes/`)) {
 		ev.preventDefault();
 
 		os.yesno({
@@ -919,13 +928,13 @@ async function onPaste(ev: ClipboardEvent) {
 			text: i18n.ts.quoteQuestion,
 		}).then(({ canceled }) => {
 			if (canceled) {
-				insertTextAtCursor(textareaEl.value, paste);
+				insertTextAtCursor(textareaEl.value!, paste);
 				return;
 			}
 
 			quoteId.value = paste
 				.substring(url.length)
-				.match(/^\/notes\/(.+?)\/?$/)[1];
+				.match(/^\/notes\/(.+?)\/?$/)![1];
 		});
 	}
 }
@@ -956,16 +965,17 @@ function onDragover(ev) {
 	}
 }
 
-function onDragenter(ev) {
+function onDragenter(_ev) {
 	draghover.value = true;
 }
 
-function onDragleave(ev) {
+function onDragleave(_ev) {
 	draghover.value = false;
 }
 
-function onDrop(ev): void {
+function onDrop(ev: DragEvent): void {
 	draghover.value = false;
+	if (ev.dataTransfer == null) return;
 
 	// ファイルだったら
 	if (ev.dataTransfer.files.length > 0) {
@@ -1064,7 +1074,7 @@ async function post() {
 
 	const processedText = preprocess(text.value);
 
-	let postData = {
+	let postData: ApiTypes.NoteSubmitReq = {
 		editId: props.editId ? props.editId : undefined,
 		text: processedText === "" ? undefined : processedText,
 		fileIds: files.value.length > 0 ? files.value.map((f) => f.id) : undefined,
@@ -1092,7 +1102,7 @@ async function post() {
 		const hashtags_ = hashtags.value
 			.trim()
 			.split(" ")
-			.map((x) => (x.startsWith("#") ? x : "#" + x))
+			.map((x) => (x.startsWith("#") ? x : `#${x}`))
 			.join(" ");
 		postData.text = postData.text ? `${postData.text} ${hashtags_}` : hashtags_;
 	}
@@ -1104,11 +1114,11 @@ async function post() {
 		}
 	}
 
-	let token;
+	let token: string | undefined;
 
 	if (postAccount.value) {
 		const storedAccounts = await getAccounts();
-		token = storedAccounts.find((x) => x.id === postAccount.value.id)?.token;
+		token = storedAccounts.find((x) => x.id === postAccount.value!.id)?.token;
 	}
 
 	posting.value = true;
@@ -1119,10 +1129,11 @@ async function post() {
 				deleteDraft();
 				emit("posted");
 				if (postData.text && postData.text !== "") {
-					const hashtags_ = mfm
-						.parse(postData.text)
-						.filter((x) => x.type === "hashtag")
-						.map((x) => x.props.hashtag);
+					const hashtags_ = (
+						mfm
+							.parse(postData.text)
+							.filter((x) => x.type === "hashtag") as mfm.MfmHashtag[]
+					).map((x) => x.props.hashtag);
 					const history = JSON.parse(
 						localStorage.getItem("hashtags") || "[]",
 					) as string[];
@@ -1133,7 +1144,7 @@ async function post() {
 				}
 				posting.value = false;
 				postAccount.value = null;
-				nextTick(() => autosize.update(textareaEl.value));
+				nextTick(() => autosize.update(textareaEl.value!));
 			});
 		})
 		.catch((err: { message: string; id: string }) => {
@@ -1169,19 +1180,23 @@ function cancel() {
 
 function insertMention() {
 	os.selectUser().then((user) => {
-		insertTextAtCursor(textareaEl.value, "@" + acct.toString(user) + " ");
+		insertTextAtCursor(textareaEl.value!, `@${acct.toString(user)} `);
 	});
 }
 
 async function insertEmoji(ev: MouseEvent) {
-	os.openEmojiPicker(ev.currentTarget ?? ev.target, {}, textareaEl.value);
+	os.openEmojiPicker(
+		(ev.currentTarget ?? ev.target) as HTMLElement,
+		{},
+		textareaEl.value,
+	);
 }
 
 async function openCheatSheet(ev: MouseEvent) {
 	os.popup(XCheatSheet, {}, {}, "closed");
 }
 
-function showActions(ev) {
+function showActions(ev: MouseEvent) {
 	os.popupMenu(
 		postFormActions.map((action) => ({
 			text: action.title,
@@ -1198,7 +1213,7 @@ function showActions(ev) {
 				);
 			},
 		})),
-		ev.currentTarget ?? ev.target,
+		(ev.currentTarget ?? ev.target) as HTMLElement,
 	);
 }
 
@@ -1209,9 +1224,9 @@ function openAccountMenu(ev: MouseEvent) {
 		{
 			withExtraOperation: false,
 			includeCurrentAccount: true,
-			active: postAccount.value != null ? postAccount.value.id : me.id,
+			active: postAccount.value != null ? postAccount.value.id : me!.id,
 			onChoose: (account) => {
-				if (account.id === me.id) {
+				if (account.id === me!.id) {
 					postAccount.value = null;
 				} else {
 					postAccount.value = account;
@@ -1232,14 +1247,14 @@ onMounted(() => {
 	}
 
 	// TODO: detach when unmount
-	new Autocomplete(textareaEl.value, text);
-	new Autocomplete(cwInputEl.value, cw);
-	new Autocomplete(hashtagsInputEl.value, hashtags);
+	new Autocomplete(textareaEl.value!, text);
+	new Autocomplete(cwInputEl.value!, cw as Ref<string>);
+	new Autocomplete(hashtagsInputEl.value!, hashtags as Ref<string>);
 
-	autosize(textareaEl.value);
+	autosize(textareaEl.value!);
 
 	nextTick(() => {
-		autosize(textareaEl.value);
+		autosize(textareaEl.value!);
 		// 書きかけの投稿を復元
 		if (!props.instant && !props.mention && !props.specified) {
 			const draft = JSON.parse(localStorage.getItem("drafts") || "{}")[
@@ -1275,8 +1290,8 @@ onMounted(() => {
 				};
 			}
 			visibility.value = init.visibility;
-			localOnly.value = init.localOnly;
-			language.value = init.lang;
+			localOnly.value = init.localOnly ?? false;
+			language.value = init.lang ?? null;
 			quoteId.value = init.renote ? init.renote.id : null;
 		}
 
@@ -1289,7 +1304,7 @@ onMounted(() => {
 		}
 
 		nextTick(() => watchForDraft());
-		nextTick(() => autosize.update(textareaEl.value));
+		nextTick(() => autosize.update(textareaEl.value!));
 	});
 });
 </script>
diff --git a/packages/client/src/components/MkPostFormDialog.vue b/packages/client/src/components/MkPostFormDialog.vue
index cf6f45e5ed..fafb4afdd4 100644
--- a/packages/client/src/components/MkPostFormDialog.vue
+++ b/packages/client/src/components/MkPostFormDialog.vue
@@ -25,6 +25,7 @@ import type { entities, languages } from "firefish-js";
 import MkModal from "@/components/MkModal.vue";
 import MkPostForm from "@/components/MkPostForm.vue";
 import type { NoteVisibility } from "@/types/note";
+import type { NoteDraft } from "@/types/post-form";
 
 const props = defineProps<{
 	reply?: entities.Note;
@@ -34,11 +35,11 @@ const props = defineProps<{
 	specified?: entities.User;
 	initialText?: string;
 	initialVisibility?: NoteVisibility;
-	initialLanguage?: typeof languages;
+	initialLanguage?: (typeof languages)[number];
 	initialFiles?: entities.DriveFile[];
 	initialLocalOnly?: boolean;
 	initialVisibleUsers?: entities.User[];
-	initialNote?: entities.Note;
+	initialNote?: NoteDraft;
 	instant?: boolean;
 	fixed?: boolean;
 	autofocus?: boolean;
@@ -53,7 +54,7 @@ const modal = shallowRef<InstanceType<typeof MkModal>>();
 const form = shallowRef<InstanceType<typeof MkPostForm>>();
 
 function onPosted() {
-	modal.value.close({
+	modal.value!.close({
 		useSendAnimation: true,
 	});
 }
diff --git a/packages/client/src/components/MkSignup.vue b/packages/client/src/components/MkSignup.vue
index 9870263b7a..0807935be3 100644
--- a/packages/client/src/components/MkSignup.vue
+++ b/packages/client/src/components/MkSignup.vue
@@ -319,7 +319,7 @@ const usernameState = ref<
 	| "invalid-format"
 	| "min-range"
 	| "max-range"
-	>(null);
+>(null);
 const invitationState = ref<null | "entered">(null);
 const emailState = ref<
 	| null
@@ -331,9 +331,10 @@ const emailState = ref<
 	| "unavailable:mx"
 	| "unavailable:smtp"
 	| "unavailable"
-	| "error">(null);
+	| "error"
+>(null);
 const passwordStrength = ref<"" | "low" | "medium" | "high">("");
-const passwordRetypeState = ref<null | "match" | "not-match" >(null);
+const passwordRetypeState = ref<null | "match" | "not-match">(null);
 const submitting = ref(false);
 const ToSAgreement = ref(false);
 const hCaptchaResponse = ref(null);
diff --git a/packages/client/src/components/MkTagCloud.vue b/packages/client/src/components/MkTagCloud.vue
index 40dee3c576..d932cbdc8c 100644
--- a/packages/client/src/components/MkTagCloud.vue
+++ b/packages/client/src/components/MkTagCloud.vue
@@ -76,6 +76,7 @@ onMounted(() => {
 					src: "/client-assets/tagcanvas.min.js",
 				}),
 			)
+			// biome-ignore lint/suspicious/noAssignInExpressions: assign it intentially
 			.addEventListener("load", () => (available.value = true));
 	}
 });
diff --git a/packages/client/src/components/MkVisibilityPicker.vue b/packages/client/src/components/MkVisibilityPicker.vue
index 088da07eb0..bfa8102615 100644
--- a/packages/client/src/components/MkVisibilityPicker.vue
+++ b/packages/client/src/components/MkVisibilityPicker.vue
@@ -153,7 +153,7 @@ const props = withDefaults(
 	defineProps<{
 		currentVisibility: NoteVisibility;
 		currentLocalOnly: boolean;
-		src?: HTMLElement;
+		src?: HTMLElement | null;
 	}>(),
 	{},
 );
diff --git a/packages/client/src/components/form/range.vue b/packages/client/src/components/form/range.vue
index d12596a86c..1377abf034 100644
--- a/packages/client/src/components/form/range.vue
+++ b/packages/client/src/components/form/range.vue
@@ -48,7 +48,7 @@ const id = os.getUniqueId();
 
 const props = withDefaults(
 	defineProps<{
-		modelValue: number;
+		modelValue: number | null;
 		disabled?: boolean;
 		min: number;
 		max: number;
diff --git a/packages/client/src/pages/clip.vue b/packages/client/src/pages/clip.vue
index ffe00beeec..8507721519 100644
--- a/packages/client/src/pages/clip.vue
+++ b/packages/client/src/pages/clip.vue
@@ -75,29 +75,29 @@ const headerActions = computed(() =>
 					icon: `${icon("ph-pencil")}`,
 					text: i18n.ts.toEdit,
 					handler: async (): Promise<void> => {
-						const { canceled, result } = await os.form(clip.value.name, {
+						const { canceled, result } = await os.form(clip.value!.name, {
 							name: {
 								type: "string",
 								label: i18n.ts.name,
-								default: clip.value.name,
+								default: clip.value!.name,
 							},
 							description: {
 								type: "string",
 								required: false,
 								multiline: true,
 								label: i18n.ts.description,
-								default: clip.value.description,
+								default: clip.value!.description,
 							},
 							isPublic: {
 								type: "boolean",
 								label: i18n.ts.public,
-								default: clip.value.isPublic,
+								default: clip.value!.isPublic,
 							},
 						});
 						if (canceled) return;
 
 						os.apiWithDialog("clips/update", {
-							clipId: clip.value.id,
+							clipId: clip.value!.id,
 							...result,
 						});
 					},
diff --git a/packages/client/src/store.ts b/packages/client/src/store.ts
index 85224f0d86..680dba286f 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -2,14 +2,15 @@ import { markRaw, ref } from "vue";
 import { isSignedIn } from "./me";
 import { Storage } from "./pizzax";
 import type { NoteVisibility } from "@/types/note";
+import type { entities, ApiTypes } from "firefish-js";
 
 export const postFormActions: {
 	title: string;
-	handler: (note: entities.Note) => void | Promise<void>;
+	handler: (from, update) => void | Promise<void>;
 }[] = [];
 export const userActions: {
 	title: string;
-	handler: (note: entities.Note) => void | Promise<void>;
+	handler: (user: entities.User) => void | Promise<void>;
 }[] = [];
 export const noteActions: {
 	title: string;
@@ -19,7 +20,7 @@ export const noteViewInterruptors: {
 	handler: (note: entities.Note) => Promise<entities.Note>;
 }[] = [];
 export const notePostInterruptors: {
-	handler: (note: entities.Note) => Promise<entities.Note>;
+	handler: (note: ApiTypes.NoteSubmitReq) => Promise<ApiTypes.NoteSubmitReq>;
 }[] = [];
 
 const menuOptions = [
@@ -466,7 +467,6 @@ import darkTheme from "@/themes/d-rosepine.json5";
  * Storage for configuration information that does not need to be constantly loaded into memory (non-reactive)
  */
 import lightTheme from "@/themes/l-rosepinedawn.json5";
-import { entities } from "firefish-js";
 
 export class ColdDeviceStorage {
 	public static default = {
diff --git a/packages/client/src/types/post-form.ts b/packages/client/src/types/post-form.ts
new file mode 100644
index 0000000000..a535ef812f
--- /dev/null
+++ b/packages/client/src/types/post-form.ts
@@ -0,0 +1,12 @@
+import type { entities } from "firefish-js";
+
+export type PollType = {
+	choices: string[];
+	multiple: boolean;
+	expiresAt: string | null;
+	expiredAfter: number | null;
+};
+
+export type NoteDraft = entities.Note & {
+	poll?: PollType;
+};
diff --git a/packages/client/tsconfig.json b/packages/client/tsconfig.json
index 4d62c784dd..51f6e8dd1e 100644
--- a/packages/client/tsconfig.json
+++ b/packages/client/tsconfig.json
@@ -30,5 +30,5 @@
 		"jsx": "preserve"
 	},
 	"compileOnSave": false,
-	"include": ["./src/**/*.ts", "./src/**/*.vue"]
+	"include": ["./src/**/*.ts", "./src/**/*.vue", "./@types"]
 }
diff --git a/packages/firefish-js/src/api.types.ts b/packages/firefish-js/src/api.types.ts
index ffb22c191b..30ae1f9cdf 100644
--- a/packages/firefish-js/src/api.types.ts
+++ b/packages/firefish-js/src/api.types.ts
@@ -36,7 +36,6 @@ import type {
 	UserDetailed,
 	UserGroup,
 	UserList,
-	UserLite,
 	UserSorting,
 } from "./entities";
 
@@ -46,11 +45,13 @@ type TODO = Record<string, any> | null;
 
 type NoParams = Record<string, never>;
 
-type ShowUserReq = { username: string; host?: string } | { userId: User["id"] };
+type ShowUserReq =
+	| { username: string; host?: string | null }
+	| { userId: User["id"] };
 
-type NoteSubmitReq = {
+export type NoteSubmitReq = {
 	editId?: null | Note["id"];
-	visibility?: "public" | "home" | "followers" | "specified";
+	visibility?: (typeof consts.noteVisibilities)[number];
 	visibleUserIds?: User["id"][];
 	text?: null | string;
 	cw?: null | string;
@@ -62,10 +63,11 @@ type NoteSubmitReq = {
 	channelId?: null | Channel["id"];
 	poll?: null | {
 		choices: string[];
-		multiple?: boolean;
-		expiresAt?: null | number;
-		expiredAfter?: null | number;
+		multiple: boolean;
+		expiresAt: string | null;
+		expiredAfter: number | null;
 	};
+	lang?: string;
 };
 
 export type Endpoints = {
diff --git a/packages/firefish-js/src/entities.ts b/packages/firefish-js/src/entities.ts
index 5858dacb43..457d7ac935 100644
--- a/packages/firefish-js/src/entities.ts
+++ b/packages/firefish-js/src/entities.ts
@@ -29,7 +29,7 @@ export type UserLite = {
 	isIndexable: boolean;
 	isCat?: boolean;
 	speakAsCat?: boolean;
-	driveCapacityOverrideMb: number | null,
+	driveCapacityOverrideMb: number | null;
 };
 
 export type UserDetailed = UserLite & {
@@ -238,8 +238,8 @@ export interface RenoteNotification extends BaseNotification {
 	user: User;
 	userId: User["id"];
 	note: Note & {
-		renote: Note,
-		renoteId: string,
+		renote: Note;
+		renoteId: string;
 	};
 }
 export interface QuoteNotification extends BaseNotification {
diff --git a/packages/firefish-js/src/index.ts b/packages/firefish-js/src/index.ts
index 6639985481..3398ed8a2e 100644
--- a/packages/firefish-js/src/index.ts
+++ b/packages/firefish-js/src/index.ts
@@ -1,6 +1,7 @@
 import * as acct from "./acct";
 import type { Acct } from "./acct";
 import { Endpoints } from "./api.types";
+import type * as ApiTypes from "./api.types";
 import * as consts from "./consts";
 import Stream, { Connection } from "./streaming";
 import * as StreamTypes from "./streaming.types";
@@ -8,6 +9,7 @@ import type * as TypeUtils from "./type-utils";
 
 export {
 	Endpoints,
+	type ApiTypes,
 	Stream,
 	Connection as ChannelConnection,
 	StreamTypes,