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Edit File: TaskQueueInterface.php

<?php namespace PYS_PRO_GLOBAL\GuzzleHttp\Promise; interface TaskQueueInterface { /** * Returns true if the queue is empty. * * @return bool */ public function isEmpty(); /** * Adds a task to the queue that will be executed the next time run is * called. */ public function add(callable $task); /** * Execute all of the pending task in the queue. */ public function run(); }