@apollo/server/src/utils/resolvable.ts

Core engine for Apollo GraphQL server

// Copyright 2019 Joseph Gentle

// Permission to use, copy, modify, and / or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.

// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS.IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
//   INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

export type Resolvable<T> = Promise<T> & {
  resolve: (t: T) => void;
  reject: (e: any) => void;
};

export default <T = void>(): Resolvable<T> => {
  let resolve: (val: T) => void;
  let reject: (err: any) => void;
  const promise = new Promise<T>((_resolve, _reject) => {
    resolve = _resolve;
    reject = _reject;
  }) as Resolvable<T>;
  promise.resolve = resolve!;
  promise.reject = reject!;
  return promise;
};