refactoring

Resolve #7779

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

@@ -0,0 +1,23 @@
+type Await<T> = T extends Promise<infer U> ? U : T;
+
+type AwaitAll<T> = {
+	[P in keyof T]: Await<T[P]>;
+};
+
+export async function awaitAll<T>(obj: T): Promise<AwaitAll<T>> {
+	const target = {} as any;
+	const keys = Object.keys(obj);
+	const values = Object.values(obj);
+
+	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;
+}