freddi301/flow-validator

// @flow

import { AsyncVType, AsyncVOptionalType } from "./AsyncVType";

export function asyncVoptional<T>(t: AsyncVType<T>): AsyncVOptionalType<T> {
  return new AsyncVOptionalType(t, async v => {
    if (v === null || v === void 0) return v;
    return t.validate(v);
  });
}