then($success, $failure); * // same as: * $promise->map($success)->catch($failure); * ``` * * @template Ts * * @param (Closure(T): Ts) $success * @param (Closure(Throwable): Ts) $failure * * @return PromiseInterface */ public function then(Closure $success, Closure $failure): PromiseInterface; /** * Attaches a callback that is invoked if this promise is fulfilled. * * The returned promise is resolved with the return value of the callback, * or is rejected with a throwable thrown from the callback. * * @template Ts * * @param (Closure(T): Ts) $success * * @return PromiseInterface */ public function map(Closure $success): PromiseInterface; /** * Attaches a callback that is invoked if this promise is rejected. * * The returned promise is resolved with the return value of the callback, * or is rejected with a throwable thrown from the callback. * * @template Ts * * @param (Closure(Throwable): Ts) $failure * * @return PromiseInterface */ public function catch(Closure $failure): PromiseInterface; /** * Attaches a callback that is always invoked when the promise is resolved. * * The returned promise resolves with the same value as this promise once the callback has finished execution. * * If the callback throws, the returned promise will be rejected with the thrown throwable. * * @param (Closure(): void) $always * * @return PromiseInterface */ public function always(Closure $always): PromiseInterface; }