react-native/flow/Promise.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @flow
 */

// 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>;
}