PromiseInterface.php

<?php
namespace GuzzleHttp\Promise;
 
interface PromiseInterface
{
    const PENDING = 'pending';
    const FULFILLED = 'fulfilled';
    const REJECTED = 'rejected';
 
    public function then(
        callable $onFulfilled = null,
        callable $onRejected = null
    );
 
    public function otherwise(callable $onRejected);
 
    public function getState();
 
    public function resolve($value);
 
    public function reject($reason);
 
    public function cancel();
 
    public function wait($unwrap = true);
}