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<?php
namespace React\Promise;
/**
* @template-covariant T
*/
interface PromiseInterface
{
/**
* 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 and rejection 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.
*
* 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.
*
* @template TFulfilled
* @template TRejected
* @param ?(callable((T is void ? null : T)): (PromiseInterface<TFulfilled>|TFulfilled)) $onFulfilled
* @param ?(callable(\Throwable): (PromiseInterface<TRejected>|TRejected)) $onRejected
* @return PromiseInterface<($onRejected is null ? ($onFulfilled is null ? T : TFulfilled) : ($onFulfilled is null ? T|TRejected : TFulfilled|TRejected))>
*/
public function then(?callable $onFulfilled = null, ?callable $onRejected = null): PromiseInterface;
/**
* Registers a rejection handler for promise. It is a shortcut for:
*
* ```php
 
 
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