async pool returns result

src/lib/AsyncPool.ts

@@ -9,11 +9,12 @@ export class AsyncPool {
 		this.limit = limit;
 	}
 
-	async run(task: () => unknown) {
+	async run<O>(task: () => Promise<O>) {
 		while (this.current >= this.limit) await this.current_changed.wait();
 		this.update_current(+1);
-		await task();
+		const result = await task();
 		this.update_current(-1);
+		return result;
 	}
 
 	update_current(increment: number) {