refactor: add a new async queue

src/utils/async-queue.ts

@@ -0,0 +1,32 @@
+export class AsyncQueue<T> {
+  private items: T[] = [];
+  private resolvers: ((value: T) => void)[] = [];
+
+  push(item: T): void {
+    if (this.resolvers.length > 0) {
+      const resolve = this.resolvers.shift()!;
+      resolve(item);
+    } else {
+      this.items.push(item);
+    }
+  }
+
+  pushAll(items: Iterable<T>): void {
+    for (const item of items) {
+      this.push(item);
+    }
+  }
+
+  async pop(): Promise<T> {
+    if (this.items.length > 0) {
+      return this.items.shift()!;
+    }
+    return new Promise<T>((resolve) => {
+      this.resolvers.push(resolve);
+    });
+  }
+
+  get length(): number {
+    return this.items.length - this.resolvers.length;
+  }
+}