safe await

safeAwait.js

export function safeAwait(promise, finallyFunc) {
  return promise.then(data => {
    return [ undefined, data ]
  }).catch(error => {
    return [ error, undefined ]
  })
}

Typescript version:

/**
 * wrap promise with error handler
 * @param {Promise} promise promise instance
 * @returns {Promise<[Error, Response]>}
 */
export function safeAwait<T>(promise: Promise<T>): Promise<[Error | null, T | null]> {
  return new Promise<[Error | null, T | null]>((resolve) => {
    promise
      .then((res) => {
        resolve([null, res])
      })
      .catch((e) => {
        resolve([e || new Error(), null])
      })
  })
}