puppeteer/lib/TaskQueue.js

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class TaskQueue {
constructor() {
this._chain = Promise.resolve();
}
/**
* @param {function()} task
* @return {!Promise}
*/
postTask(task) {
const result = this._chain.then(task);
this._chain = result.catch(() => {});
return result;
}
}
module.exports = TaskQueue;