なんかもうめっちゃ変えた

packages/backend/src/misc/prelude/await-all.ts

@@ -0,0 +1,21 @@
+export type Promiseable<T> = {
+	[K in keyof T]: Promise<T[K]> | T[K];
+};
+
+export async function awaitAll<T>(obj: Promiseable<T>): Promise<T> {
+	const target = {} as T;
+	const keys = Object.keys(obj) as unknown as (keyof T)[];
+	const values = Object.values(obj) as any[];
+
+	const resolvedValues = await Promise.all(values.map(value =>
+		(!value || !value.constructor || value.constructor.name !== 'Object')
+			? value
+			: awaitAll(value)
+	));
+
+	for (let i = 0; i < keys.length; i++) {
+		target[keys[i]] = resolvedValues[i];
+	}
+
+	return target;
+}