react-native/flow/Promise.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
* @format
*/
// These annotations are copy/pasted from the built-in Flow definitions for
// Native Promises with some non-standard APIs added in
declare class Promise<+R> {
constructor(
callback: (
resolve: (result?: Promise<R> | R) => void,
reject: (error?: any) => void,
) => mixed,
): void;
then<U>(
onFulfill?: ?(value: R) => Promise<U> | ?U,
onReject?: ?(error: any) => Promise<U> | ?U,
): Promise<U>;
catch<U>(onReject?: (error: any) => ?Promise<U> | U): Promise<U>;
static resolve<T>(object?: Promise<T> | T): Promise<T>;
static reject<T>(error?: any): Promise<T>;
static all<T: Iterable<mixed>>(
promises: T,
): Promise<$TupleMap<T, typeof $await>>;
static race<T>(promises: Array<Promise<T>>): Promise<T>;
// Non-standard APIs
// See https://github.com/facebook/fbjs/blob/master/packages/fbjs/src/__forks__/Promise.native.js#L21
finally<U>(onFinally?: ?(value: any) => Promise<U> | U): Promise<U>;
done<U>(
onFulfill?: ?(value: R) => mixed,
onReject?: ?(error: any) => mixed,
): void;
static cast<T>(object?: T): Promise<T>;
}