async-wrappers/es/pending.js

A set of wrapper functions to perform debouncing, throttling, retrying etc.

/**
 * @internal
 */
const throwSettled = () => {
  throw new Error('pending cannot be changed after it has settled');
};
/**
 * Used to hold a pending result
 * @internal
 */


/**
 * create a waiting empty result
 * @internal
 */
const pending = () => {
  const value = {};
  value.promise = new Promise((resolve, reject) => {
    value.complete = arg => {
      resolve(arg);
      reject = resolve = throwSettled;
      return value.promise;
    };

    value.error = err => {
      reject(err);
      reject = resolve = throwSettled;
      return value.promise;
    };
  });
  return value;
};

export default pending;