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-React/Promise
-=============
-
-A lightweight implementation of
-[CommonJS Promises/A](http://wiki.commonjs.org/wiki/Promises/A) for PHP.
-
-[![Build Status](https://travis-ci.org/reactphp/promise.svg?branch=master)](http://travis-ci.org/reactphp/promise)
-[![Coverage Status](https://coveralls.io/repos/github/reactphp/promise/badge.svg?branch=master)](https://coveralls.io/github/reactphp/promise?branch=master)
-
-Table of Contents
------------------
-
-1. [Introduction](#introduction)
-2. [Concepts](#concepts)
-   * [Deferred](#deferred)
-   * [Promise](#promise)
-3. [API](#api)
-   * [Deferred](#deferred-1)
-     * [Deferred::promise()](#deferredpromise)
-     * [Deferred::resolve()](#deferredresolve)
-     * [Deferred::reject()](#deferredreject)
-     * [Deferred::notify()](#deferrednotify)
-   * [PromiseInterface](#promiseinterface)
-     * [PromiseInterface::then()](#promiseinterfacethen)
-   * [ExtendedPromiseInterface](#extendedpromiseinterface)
-        * [ExtendedPromiseInterface::done()](#extendedpromiseinterfacedone)
-        * [ExtendedPromiseInterface::otherwise()](#extendedpromiseinterfaceotherwise)
-        * [ExtendedPromiseInterface::always()](#extendedpromiseinterfacealways)
-        * [ExtendedPromiseInterface::progress()](#extendedpromiseinterfaceprogress)
-   * [CancellablePromiseInterface](#cancellablepromiseinterface)
-        * [CancellablePromiseInterface::cancel()](#cancellablepromiseinterfacecancel)
-   * [Promise](#promise-1)
-   * [FulfilledPromise](#fulfilledpromise)
-   * [RejectedPromise](#rejectedpromise)
-   * [LazyPromise](#lazypromise)
-   * [Functions](#functions)
-     * [resolve()](#resolve)
-     * [reject()](#reject)
-     * [all()](#all)
-     * [race()](#race)
-     * [any()](#any)
-     * [some()](#some)
-     * [map()](#map)
-     * [reduce()](#reduce)
-   * [PromisorInterface](#promisorinterface)
-4. [Examples](#examples)
-   * [How to use Deferred](#how-to-use-deferred)
-   * [How promise forwarding works](#how-promise-forwarding-works)
-     * [Resolution forwarding](#resolution-forwarding)
-     * [Rejection forwarding](#rejection-forwarding)
-     * [Mixed resolution and rejection forwarding](#mixed-resolution-and-rejection-forwarding)
-     * [Progress event forwarding](#progress-event-forwarding)
-   * [done() vs. then()](#done-vs-then)
-5. [Credits](#credits)
-6. [License](#license)
-
-Introduction
-------------
-
-React/Promise is a library implementing
-[CommonJS Promises/A](http://wiki.commonjs.org/wiki/Promises/A) for PHP.
-
-It also provides several other useful promise-related concepts, such as joining
-multiple promises and mapping and reducing collections of promises.
-
-If you've never heard about promises before,
-[read this first](https://gist.github.com/3889970).
-
-Concepts
---------
-
-### Deferred
-
-A **Deferred** represents a computation or unit of work that may not have
-completed yet. Typically (but not always), that computation will be something
-that executes asynchronously and completes at some point in the future.
-
-### Promise
-
-While a deferred represents the computation itself, a **Promise** represents
-the result of that computation. Thus, each deferred has a promise that acts as
-a placeholder for its actual result.
-
-API
----
-
-### Deferred
-
-A deferred represents an operation whose resolution is pending. It has separate
-promise and resolver parts.
-
-```php
-$deferred = new React\Promise\Deferred();
-
-$promise = $deferred->promise();
-
-$deferred->resolve(mixed $value = null);
-$deferred->reject(mixed $reason = null);
-$deferred->notify(mixed $update = null);
-```
-
-The `promise` method returns the promise of the deferred.
-
-The `resolve` and `reject` methods control the state of the deferred.
-
-The `notify` method is for progress notification.
-
-The constructor of the `Deferred` accepts an optional `$canceller` argument.
-See [Promise](#promise-1) for more information.
-
-#### Deferred::promise()
-
-```php
-$promise = $deferred->promise();
-```
-
-Returns the promise of the deferred, which you can hand out to others while
-keeping the authority to modify its state to yourself.
-
-#### Deferred::resolve()
-
-```php
-$deferred->resolve(mixed $value = null);
-```
-
-Resolves the promise returned by `promise()`. All consumers are notified by
-having `$onFulfilled` (which they registered via `$promise->then()`) called with
-`$value`.
-
-If `$value` itself is a promise, the promise will transition to the state of
-this promise once it is resolved.
-
-#### Deferred::reject()
-
-```php
-$deferred->reject(mixed $reason = null);
-```
-
-Rejects the promise returned by `promise()`, signalling that the deferred's
-computation failed.
-All consumers are notified by having `$onRejected` (which they registered via
-`$promise->then()`) called with `$reason`.
-
-If `$reason` itself is a promise, the promise will be rejected with the outcome
-of this promise regardless whether it fulfills or rejects.
-
-#### Deferred::notify()
-
-```php
-$deferred->notify(mixed $update = null);
-```
-
-Triggers progress notifications, to indicate to consumers that the computation
-is making progress toward its result.
-
-All consumers are notified by having `$onProgress` (which they registered via
-`$promise->then()`) called with `$update`.
-
-### PromiseInterface
-
-The promise interface provides the common interface for all promise
-implementations.
-
-A promise represents an eventual outcome, which is either fulfillment (success)
-and an associated value, or rejection (failure) and an associated reason.
-
-Once in the fulfilled or rejected state, a promise becomes immutable.
-Neither its state nor its result (or error) can be modified.
-
-#### Implementations
-
-* [Promise](#promise-1)
-* [FulfilledPromise](#fulfilledpromise)
-* [RejectedPromise](#rejectedpromise)
-* [LazyPromise](#lazypromise)
-
-#### PromiseInterface::then()
-
-```php
-$transformedPromise = $promise->then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
-```
-
-Transforms a promise's value by applying a function to the promise's fulfillment
-or rejection value. Returns a new promise for the transformed result.
-
-The `then()` method registers new fulfilled, rejection and progress handlers
-with a promise (all parameters are optional):
-
-  * `$onFulfilled` will be invoked once the promise is fulfilled and passed
-    the result as the first argument.
-  * `$onRejected` will be invoked once the promise is rejected and passed the
-    reason as the first argument.
-  * `$onProgress` will be invoked whenever the producer of the promise
-    triggers progress notifications and passed a single argument (whatever it
-    wants) to indicate progress.
-
-It returns a new promise that will fulfill with the return value of either
-`$onFulfilled` or `$onRejected`, whichever is called, or will reject with
-the thrown exception if either throws.
-
-A promise makes the following guarantees about handlers registered in
-the same call to `then()`:
-
-  1. Only one of `$onFulfilled` or `$onRejected` will be called,
-     never both.
-  2. `$onFulfilled` and `$onRejected` will never be called more
-     than once.
-  3. `$onProgress` may be called multiple times.
-
-#### See also
-
-* [resolve()](#resolve) - Creating a resolved promise
-* [reject()](#reject) - Creating a rejected promise
-* [ExtendedPromiseInterface::done()](#extendedpromiseinterfacedone)
-* [done() vs. then()](#done-vs-then)
-
-### ExtendedPromiseInterface
-
-The ExtendedPromiseInterface extends the PromiseInterface with useful shortcut
-and utility methods which are not part of the Promises/A specification.
-
-#### Implementations
-
-* [Promise](#promise-1)
-* [FulfilledPromise](#fulfilledpromise)
-* [RejectedPromise](#rejectedpromise)
-* [LazyPromise](#lazypromise)
-
-#### ExtendedPromiseInterface::done()
-
-```php
-$promise->done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null);
-```
-
-Consumes the promise's ultimate value if the promise fulfills, or handles the
-ultimate error.
-
-It will cause a fatal error if either `$onFulfilled` or `$onRejected` throw or
-return a rejected promise.
-
-Since the purpose of `done()` is consumption rather than transformation,
-`done()` always returns `null`.
-
-#### See also
-
-* [PromiseInterface::then()](#promiseinterfacethen)
-* [done() vs. then()](#done-vs-then)
-
-#### ExtendedPromiseInterface::otherwise()
-
-```php
-$promise->otherwise(callable $onRejected);
-```
-
-Registers a rejection handler for promise. It is a shortcut for:
-
-```php
-$promise->then(null, $onRejected);
-```
-
-Additionally, you can type hint the `$reason` argument of `$onRejected` to catch
-only specific errors.
-
-```php
-$promise
-    ->otherwise(function (\RuntimeException $reason) {
-        // Only catch \RuntimeException instances
-        // All other types of errors will propagate automatically
-    })
-    ->otherwise(function ($reason) {
-        // Catch other errors
-    )};
-```
-
-#### ExtendedPromiseInterface::always()
-
-```php
-$newPromise = $promise->always(callable $onFulfilledOrRejected);
-```
-
-Allows you to execute "cleanup" type tasks in a promise chain.
-
-It arranges for `$onFulfilledOrRejected` to be called, with no arguments,
-when the promise is either fulfilled or rejected.
-
-* If `$promise` fulfills, and `$onFulfilledOrRejected` returns successfully,
-  `$newPromise` will fulfill with the same value as `$promise`.
-* If `$promise` fulfills, and `$onFulfilledOrRejected` throws or returns a
-  rejected promise, `$newPromise` will reject with the thrown exception or
-  rejected promise's reason.
-* If `$promise` rejects, and `$onFulfilledOrRejected` returns successfully,
-  `$newPromise` will reject with the same reason as `$promise`.
-* If `$promise` rejects, and `$onFulfilledOrRejected` throws or returns a
-  rejected promise, `$newPromise` will reject with the thrown exception or
-  rejected promise's reason.
-
-`always()` behaves similarly to the synchronous finally statement. When combined
-with `otherwise()`, `always()` allows you to write code that is similar to the familiar
-synchronous catch/finally pair.
-
-Consider the following synchronous code:
-
-```php
-try {
-  return doSomething();
-} catch(\Exception $e) {
-    return handleError($e);
-} finally {
-    cleanup();
-}
-```
-
-Similar asynchronous code (with `doSomething()` that returns a promise) can be
-written:
-
-```php
-return doSomething()
-    ->otherwise('handleError')
-    ->always('cleanup');
-```
-
-#### ExtendedPromiseInterface::progress()
-
-```php
-$promise->progress(callable $onProgress);
-```
-
-Registers a handler for progress updates from promise. It is a shortcut for:
-
-```php
-$promise->then(null, null, $onProgress);
-```
-
-### CancellablePromiseInterface
-
-A cancellable promise provides a mechanism for consumers to notify the creator
-of the promise that they are not longer interested in the result of an
-operation.
-
-#### CancellablePromiseInterface::cancel()
-
-``` php
-$promise->cancel();
-```
-
-The `cancel()` method notifies the creator of the promise that there is no
-further interest in the results of the operation.
-
-Once a promise is settled (either fulfilled or rejected), calling `cancel()` on
-a promise has no effect.
-
-#### Implementations
-
-* [Promise](#promise-1)
-* [FulfilledPromise](#fulfilledpromise)
-* [RejectedPromise](#rejectedpromise)
-* [LazyPromise](#lazypromise)
-
-### Promise
-
-Creates a promise whose state is controlled by the functions passed to
-`$resolver`.
-
-```php
-$resolver = function (callable $resolve, callable $reject, callable $notify) {
-    // Do some work, possibly asynchronously, and then
-    // resolve or reject. You can notify of progress events
-    // along the way if you want/need.
-
-    $resolve($awesomeResult);
-    // or $resolve($anotherPromise);
-    // or $reject($nastyError);
-    // or $notify($progressNotification);
-};
-
-$canceller = function (callable $resolve, callable $reject, callable $progress) {
-    // Cancel/abort any running operations like network connections, streams etc.
-
-    $reject(new \Exception('Promise cancelled'));
-};
-
-$promise = new React\Promise\Promise($resolver, $canceller);
-```
-
-The promise constructor receives a resolver function and an optional canceller
-function which both will be called with 3 arguments:
-
-  * `$resolve($value)` - Primary function that seals the fate of the
-    returned promise. Accepts either a non-promise value, or another promise.
-    When called with a non-promise value, fulfills promise with that value.
-    When called with another promise, e.g. `$resolve($otherPromise)`, promise's
-    fate will be equivalent to that of `$otherPromise`.
-  * `$reject($reason)` - Function that rejects the promise.
-  * `$notify($update)` - Function that issues progress events for the promise.
-
-If the resolver or canceller throw an exception, the promise will be rejected
-with that thrown exception as the rejection reason.
-
-The resolver function will be called immediately, the canceller function only
-once all consumers called the `cancel()` method of the promise.
-
-### FulfilledPromise
-
-Creates a already fulfilled promise.
-
-```php
-$promise = React\Promise\FulfilledPromise($value);
-```
-
-Note, that `$value` **cannot** be a promise. It's recommended to use
-[resolve()](#resolve) for creating resolved promises.
-
-### RejectedPromise
-
-Creates a already rejected promise.
-
-```php
-$promise = React\Promise\RejectedPromise($reason);
-```
-
-Note, that `$reason` **cannot** be a promise. It's recommended to use
-[reject()](#reject) for creating rejected promises.
-
-### LazyPromise
-
-Creates a promise which will be lazily initialized by `$factory` once a consumer
-calls the `then()` method.
-
-```php
-$factory = function () {
-    $deferred = new React\Promise\Deferred();
-
-    // Do some heavy stuff here and resolve the deferred once completed
-
-    return $deferred->promise();
-};
-
-$promise = React\Promise\LazyPromise($factory);
-
-// $factory will only be executed once we call then()
-$promise->then(function ($value) {
-});
-```
-
-### Functions
-
-Useful functions for creating, joining, mapping and reducing collections of
-promises.
-
-All functions working on promise collections (like `all()`, `race()`, `some()`
-etc.) support cancellation. This means, if you call `cancel()` on the returned
-promise, all promises in the collection are cancelled. If the collection itself
-is a promise which resolves to an array, this promise is also cancelled.
-
-#### resolve()
-
-```php
-$promise = React\Promise\resolve(mixed $promiseOrValue);
-```
-
-Creates a promise for the supplied `$promiseOrValue`.
-
-If `$promiseOrValue` is a value, it will be the resolution value of the
-returned promise.
-
-If `$promiseOrValue` is a thenable (any object that provides a `then()` method),
-a trusted promise that follows the state of the thenable is returned.
-
-If `$promiseOrValue` is a promise, it will be returned as is.
-
-Note: The promise returned is always a promise implementing
-[ExtendedPromiseInterface](#extendedpromiseinterface). If you pass in a custom
-promise which only implements [PromiseInterface](#promiseinterface), this
-promise will be assimilated to a extended promise following `$promiseOrValue`.
-
-#### reject()
-
-```php
-$promise = React\Promise\reject(mixed $promiseOrValue);
-```
-
-Creates a rejected promise for the supplied `$promiseOrValue`.
-
-If `$promiseOrValue` is a value, it will be the rejection value of the
-returned promise.
-
-If `$promiseOrValue` is a promise, its completion value will be the rejected
-value of the returned promise.
-
-This can be useful in situations where you need to reject a promise without
-throwing an exception. For example, it allows you to propagate a rejection with
-the value of another promise.
-
-#### all()
-
-```php
-$promise = React\Promise\all(array|React\Promise\PromiseInterface $promisesOrValues);
-```
-
-Returns a promise that will resolve only once all the items in
-`$promisesOrValues` have resolved. The resolution value of the returned promise
-will be an array containing the resolution values of each of the items in
-`$promisesOrValues`.
-
-#### race()
-
-```php
-$promise = React\Promise\race(array|React\Promise\PromiseInterface $promisesOrValues);
-```
-
-Initiates a competitive race that allows one winner. Returns a promise which is
-resolved in the same way the first settled promise resolves.
-
-#### any()
-
-```php
-$promise = React\Promise\any(array|React\Promise\PromiseInterface $promisesOrValues);
-```
-
-Returns a promise that will resolve when any one of the items in
-`$promisesOrValues` resolves. The resolution value of the returned promise
-will be the resolution value of the triggering item.
-
-The returned promise will only reject if *all* items in `$promisesOrValues` are
-rejected. The rejection value will be an array of all rejection reasons.
-
-The returned promise will also reject with a `React\Promise\Exception\LengthException`
-if `$promisesOrValues` contains 0 items.
-
-#### some()
-
-```php
-$promise = React\Promise\some(array|React\Promise\PromiseInterface $promisesOrValues, integer $howMany);
-```
-
-Returns a promise that will resolve when `$howMany` of the supplied items in
-`$promisesOrValues` resolve. The resolution value of the returned promise
-will be an array of length `$howMany` containing the resolution values of the
-triggering items.
-
-The returned promise will reject if it becomes impossible for `$howMany` items
-to resolve (that is, when `(count($promisesOrValues) - $howMany) + 1` items
-reject). The rejection value will be an array of
-`(count($promisesOrValues) - $howMany) + 1` rejection reasons.
-
-The returned promise will also reject with a `React\Promise\Exception\LengthException`
-if `$promisesOrValues` contains less items than `$howMany`.
-
-#### map()
-
-```php
-$promise = React\Promise\map(array|React\Promise\PromiseInterface $promisesOrValues, callable $mapFunc);
-```
-
-Traditional map function, similar to `array_map()`, but allows input to contain
-promises and/or values, and `$mapFunc` may return either a value or a promise.
-
-The map function receives each item as argument, where item is a fully resolved
-value of a promise or value in `$promisesOrValues`.
-
-#### reduce()
-
-```php
-$promise = React\Promise\reduce(array|React\Promise\PromiseInterface $promisesOrValues, callable $reduceFunc , $initialValue = null);
-```
-
-Traditional reduce function, similar to `array_reduce()`, but input may contain
-promises and/or values, and `$reduceFunc` may return either a value or a
-promise, *and* `$initialValue` may be a promise or a value for the starting
-value.
-
-### PromisorInterface
-
-The `React\Promise\PromisorInterface` provides a common interface for objects
-that provide a promise. `React\Promise\Deferred` implements it, but since it
-is part of the public API anyone can implement it.
-
-Examples
---------
-
-### How to use Deferred
-
-```php
-function getAwesomeResultPromise()
-{
-    $deferred = new React\Promise\Deferred();
-
-    // Execute a Node.js-style function using the callback pattern
-    computeAwesomeResultAsynchronously(function ($error, $result) use ($deferred) {
-        if ($error) {
-            $deferred->reject($error);
-        } else {
-            $deferred->resolve($result);
-        }
-    });
-
-    // Return the promise
-    return $deferred->promise();
-}
-
-getAwesomeResultPromise()
-    ->then(
-        function ($value) {
-            // Deferred resolved, do something with $value
-        },
-        function ($reason) {
-            // Deferred rejected, do something with $reason
-        },
-        function ($update) {
-            // Progress notification triggered, do something with $update
-        }
-    );
-```
-
-### How promise forwarding works
-
-A few simple examples to show how the mechanics of Promises/A forwarding works.
-These examples are contrived, of course, and in real usage, promise chains will
-typically be spread across several function calls, or even several levels of
-your application architecture.
-
-#### Resolution forwarding
-
-Resolved promises forward resolution values to the next promise.
-The first promise, `$deferred->promise()`, will resolve with the value passed
-to `$deferred->resolve()` below.
-
-Each call to `then()` returns a new promise that will resolve with the return
-value of the previous handler. This creates a promise "pipeline".
-
-```php
-$deferred = new React\Promise\Deferred();
-
-$deferred->promise()
-    ->then(function ($x) {
-        // $x will be the value passed to $deferred->resolve() below
-        // and returns a *new promise* for $x + 1
-        return $x + 1;
-    })
-    ->then(function ($x) {
-        // $x === 2
-        // This handler receives the return value of the
-        // previous handler.
-        return $x + 1;
-    })
-    ->then(function ($x) {
-        // $x === 3
-        // This handler receives the return value of the
-        // previous handler.
-        return $x + 1;
-    })
-    ->then(function ($x) {
-        // $x === 4
-        // This handler receives the return value of the
-        // previous handler.
-        echo 'Resolve ' . $x;
-    });
-
-$deferred->resolve(1); // Prints "Resolve 4"
-```
-
-#### Rejection forwarding
-
-Rejected promises behave similarly, and also work similarly to try/catch:
-When you catch an exception, you must rethrow for it to propagate.
-
-Similarly, when you handle a rejected promise, to propagate the rejection,
-"rethrow" it by either returning a rejected promise, or actually throwing
-(since promise translates thrown exceptions into rejections)
-
-```php
-$deferred = new React\Promise\Deferred();
-
-$deferred->promise()
-    ->then(function ($x) {
-        throw new \Exception($x + 1);
-    })
-    ->otherwise(function (\Exception $x) {
-        // Propagate the rejection
-        throw $x;
-    })
-    ->otherwise(function (\Exception $x) {
-        // Can also propagate by returning another rejection
-        return React\Promise\reject(
-            new \Exception($x->getMessage() + 1)
-        );
-    })
-    ->otherwise(function ($x) {
-        echo 'Reject ' . $x->getMessage(); // 3
-    });
-
-$deferred->resolve(1);  // Prints "Reject 3"
-```
-
-#### Mixed resolution and rejection forwarding
-
-Just like try/catch, you can choose to propagate or not. Mixing resolutions and
-rejections will still forward handler results in a predictable way.
-
-```php
-$deferred = new React\Promise\Deferred();
-
-$deferred->promise()
-    ->then(function ($x) {
-        return $x + 1;
-    })
-    ->then(function ($x) {
-        throw new \Exception($x + 1);
-    })
-    ->otherwise(function (\Exception $x) {
-        // Handle the rejection, and don't propagate.
-        // This is like catch without a rethrow
-        return $x->getMessage() + 1;
-    })
-    ->then(function ($x) {
-        echo 'Mixed ' . $x; // 4
-    });
-
-$deferred->resolve(1);  // Prints "Mixed 4"
-```
-
-#### Progress event forwarding
-
-In the same way as resolution and rejection handlers, your progress handler
-**MUST** return a progress event to be propagated to the next link in the chain.
-If you return nothing, `null` will be propagated.
-
-Also in the same way as resolutions and rejections, if you don't register a
-progress handler, the update will be propagated through.
-
-If your progress handler throws an exception, the exception will be propagated
-to the next link in the chain. The best thing to do is to ensure your progress
-handlers do not throw exceptions.
-
-This gives you the opportunity to transform progress events at each step in the
-chain so that they are meaningful to the next step. It also allows you to choose
-not to transform them, and simply let them propagate untransformed, by not
-registering a progress handler.
-
-```php
-$deferred = new React\Promise\Deferred();
-
-$deferred->promise()
-    ->progress(function ($update) {
-        return $update + 1;
-    })
-    ->progress(function ($update) {
-        echo 'Progress ' . $update; // 2
-    });
-
-$deferred->notify(1);  // Prints "Progress 2"
-```
-
-### done() vs. then()
-
-The golden rule is:
-
-    Either return your promise, or call done() on it.
-
-At a first glance, `then()` and `done()` seem very similar. However, there are
-important distinctions.
-
-The intent of `then()` is to transform a promise's value and to pass or return
-a new promise for the transformed value along to other parts of your code.
-
-The intent of `done()` is to consume a promise's value, transferring
-responsibility for the value to your code.
-
-In addition to transforming a value, `then()` allows you to recover from, or
-propagate intermediate errors. Any errors that are not handled will be caught
-by the promise machinery and used to reject the promise returned by `then()`.
-
-Calling `done()` transfers all responsibility for errors to your code. If an
-error (either a thrown exception or returned rejection) escapes the
-`$onFulfilled` or `$onRejected` callbacks you provide to done, it will be
-rethrown in an uncatchable way causing a fatal error.
-
-```php
-function getJsonResult()
-{
-    return queryApi()
-        ->then(
-            // Transform API results to an object
-            function ($jsonResultString) {
-                return json_decode($jsonResultString);
-            },
-            // Transform API errors to an exception
-            function ($jsonErrorString) {
-                $object = json_decode($jsonErrorString);
-                throw new ApiErrorException($object->errorMessage);
-            }
-        );
-}
-
-// Here we provide no rejection handler. If the promise returned has been
-// rejected, the ApiErrorException will be thrown
-getJsonResult()
-    ->done(
-        // Consume transformed object
-        function ($jsonResultObject) {
-            // Do something with $jsonResultObject
-        }
-    );
-
-// Here we provide a rejection handler which will either throw while debugging
-// or log the exception
-getJsonResult()
-    ->done(
-        function ($jsonResultObject) {
-            // Do something with $jsonResultObject
-        },
-        function (ApiErrorException $exception) {
-            if (isDebug()) {
-                throw $exception;
-            } else {
-                logException($exception);
-            }
-        }
-    );
-```
-
-Note that if a rejection value is not an instance of `\Exception`, it will be
-wrapped in an exception of the type `React\Promise\UnhandledRejectionException`.
-
-You can get the original rejection reason by calling `$exception->getReason()`.
-
-Credits
--------
-
-React/Promise is a port of [when.js](https://github.com/cujojs/when)
-by [Brian Cavalier](https://github.com/briancavalier).
-
-Also, large parts of the documentation have been ported from the when.js
-[Wiki](https://github.com/cujojs/when/wiki) and the
-[API docs](https://github.com/cujojs/when/blob/master/docs/api.md).
-
-License
--------
-
-React/Promise is released under the [MIT](https://github.com/reactphp/promise/blob/master/LICENSE) license.