A code example from the article https://www.joshwulf.com/blog/2020/03/array-async-failure

async-task.ts

class AsyncTask<T> {
  _run: () => Promise<T>;
  _success: (result: T) => void;
  _error: (e: Error) => void;

  constructor({
    error,
    run,
    success
  }: {
    error: (e: Error) => void;
    run: () => Promise<T>;
    success: (result: T) => void;
  }) {
    this._run = run;
    this._success = success;
    this._error = error;
  }

  run = () => this._run()
}