Refactor API (#4770)

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* Update description.ts

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src/prelude/await-all.ts

@@ -0,0 +1,22 @@
+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 rawValues = Object.values(obj);
+	const retValues = ((values: any[]): any[] =>
+		values.map(value => {
+			if (!value || !value.constructor || value.constructor.name !== 'Object') return value;
+			return awaitAll(value);
+		})
+	)(rawValues);
+	const values = await Promise.all(retValues);
+	for (let i = 0; i < values.length; i++) {
+		target[keys[i]] = values[i];
+	}
+	return target;
+}