/**
 * Copyright 2020 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export class TaskQueue {
	#chain: Promise<void>;

	constructor() {
		this.#chain = Promise.resolve();
	}

	postTask<T>(task: () => Promise<T>): Promise<T> {
		const result = this.#chain.then(task);
		this.#chain = result.then(
			() => {
				return undefined;
			},
			() => {
				return undefined;
			},
		);
		return result;
	}
}