diff --git a/packages/frontend/src/os.ts b/packages/frontend/src/os.ts
index 6e36f18374..15d725defb 100644
--- a/packages/frontend/src/os.ts
+++ b/packages/frontend/src/os.ts
@@ -4,89 +4,11 @@ import { Component, markRaw, Ref, ref, defineAsyncComponent } from 'vue';
 import { EventEmitter } from 'eventemitter3';
 import insertTextAtCursor from 'insert-text-at-cursor';
 import * as Misskey from 'misskey-js';
-import { apiUrl, url } from '@/config';
 import MkPostFormDialog from '@/components/MkPostFormDialog.vue';
 import MkWaitingDialog from '@/components/MkWaitingDialog.vue';
 import { MenuItem } from '@/types/menu';
-import { $i } from '@/account';
-
-export const pendingApiRequestsCount = ref(0);
-
-const apiClient = new Misskey.api.APIClient({
-	origin: url,
-});
-
-export const api = ((endpoint: string, data: Record<string, any> = {}, token?: string | null | undefined) => {
-	pendingApiRequestsCount.value++;
-
-	const onFinally = () => {
-		pendingApiRequestsCount.value--;
-	};
-
-	const promise = new Promise((resolve, reject) => {
-		// Append a credential
-		if ($i) (data as any).i = $i.token;
-		if (token !== undefined) (data as any).i = token;
-
-		// Send request
-		window.fetch(endpoint.indexOf('://') > -1 ? endpoint : `${apiUrl}/${endpoint}`, {
-			method: 'POST',
-			body: JSON.stringify(data),
-			credentials: 'omit',
-			cache: 'no-cache',
-			headers: {
-				'Content-Type': 'application/json',
-			},
-		}).then(async (res) => {
-			const body = res.status === 204 ? null : await res.json();
-
-			if (res.status === 200) {
-				resolve(body);
-			} else if (res.status === 204) {
-				resolve();
-			} else {
-				reject(body.error);
-			}
-		}).catch(reject);
-	});
-
-	promise.then(onFinally, onFinally);
-
-	return promise;
-}) as typeof apiClient.request;
-
-export const apiGet = ((endpoint: string, data: Record<string, any> = {}) => {
-	pendingApiRequestsCount.value++;
-
-	const onFinally = () => {
-		pendingApiRequestsCount.value--;
-	};
-
-	const query = new URLSearchParams(data);
-
-	const promise = new Promise((resolve, reject) => {
-		// Send request
-		window.fetch(`${apiUrl}/${endpoint}?${query}`, {
-			method: 'GET',
-			credentials: 'omit',
-			cache: 'default',
-		}).then(async (res) => {
-			const body = res.status === 204 ? null : await res.json();
-
-			if (res.status === 200) {
-				resolve(body);
-			} else if (res.status === 204) {
-				resolve();
-			} else {
-				reject(body.error);
-			}
-		}).catch(reject);
-	});
-
-	promise.then(onFinally, onFinally);
-
-	return promise;
-}) as typeof apiClient.request;
+import { pendingApiRequestsCount, api, apiGet } from '@/scripts/api';
+export { pendingApiRequestsCount, api, apiGet };
 
 export const apiWithDialog = ((
 	endpoint: string,
diff --git a/packages/frontend/src/scripts/api.ts b/packages/frontend/src/scripts/api.ts
new file mode 100644
index 0000000000..82b1ba3cea
--- /dev/null
+++ b/packages/frontend/src/scripts/api.ts
@@ -0,0 +1,79 @@
+import { Endpoints } from 'misskey-js/built/api.types';
+import { ref } from 'vue';
+import { apiUrl } from '@/config';
+import { $i } from '@/account';
+export const pendingApiRequestsCount = ref(0);
+
+// Implements Misskey.api.ApiClient.request
+export function api<E extends keyof Endpoints, P extends Endpoints[E]['req']>(endpoint: E, data: P = {} as any, token?: string | null | undefined): Promise<Endpoints[E]['res']> {
+	pendingApiRequestsCount.value++;
+
+	const onFinally = () => {
+		pendingApiRequestsCount.value--;
+	};
+
+	const promise = new Promise<Endpoints[E]['res'] | void>((resolve, reject) => {
+		// Append a credential
+		if ($i) (data as any).i = $i.token;
+		if (token !== undefined) (data as any).i = token;
+
+		// Send request
+		window.fetch(endpoint.indexOf('://') > -1 ? endpoint : `${apiUrl}/${endpoint}`, {
+			method: 'POST',
+			body: JSON.stringify(data),
+			credentials: 'omit',
+			cache: 'no-cache',
+			headers: {
+				'Content-Type': 'application/json',
+			},
+		}).then(async (res) => {
+			const body = res.status === 204 ? null : await res.json();
+
+			if (res.status === 200) {
+				resolve(body);
+			} else if (res.status === 204) {
+				resolve();
+			} else {
+				reject(body.error);
+			}
+		}).catch(reject);
+	});
+
+	promise.then(onFinally, onFinally);
+
+	return promise;
+};
+
+// Implements Misskey.api.ApiClient.request
+export function apiGet<E extends keyof Endpoints, P extends Endpoints[E]['req']>(endpoint: E, data: P = {} as any): Promise<Endpoints[E]['res']> {
+	pendingApiRequestsCount.value++;
+
+	const onFinally = () => {
+		pendingApiRequestsCount.value--;
+	};
+
+	const query = new URLSearchParams(data as any);
+
+	const promise = new Promise<Endpoints[E]['res'] | void>((resolve, reject) => {
+		// Send request
+		window.fetch(`${apiUrl}/${endpoint}?${query}`, {
+			method: 'GET',
+			credentials: 'omit',
+			cache: 'default',
+		}).then(async (res) => {
+			const body = res.status === 204 ? null : await res.json();
+
+			if (res.status === 200) {
+				resolve(body);
+			} else if (res.status === 204) {
+				resolve();
+			} else {
+				reject(body.error);
+			}
+		}).catch(reject);
+	});
+
+	promise.then(onFinally, onFinally);
+
+	return promise;
+};