jest-metadata/src/utils/makeDeferred.ts

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export function makeDeferred<T>(): Deferred<T> {
  let resolve: (value: T) => void;
  let reject: (reason?: unknown) => void;
  const promise = new Promise<T>((_resolve, _reject) => {
    resolve = _resolve;
    reject = _reject;
  });

  return {
    promise: promise,
    resolve: resolve!,
    reject: reject!,
  };
}

export type Deferred<T> = {
  promise: Promise<T>;
  resolve: (value: T) => void;
  reject: (reason?: unknown) => void;
};