Chained promises not passing on rejection

Question

I am have a problem understanding why rejections are not passed on through a promise chain and I am hoping someone will be able to help me understand why. To me, attaching f

Answer 1

Use can wrap the errors at each level of the Promise. I chained the errors in TraceError:

class TraceError extends Error {
  constructor(message, ...causes) {
    super(message);

    const stack = Object.getOwnPropertyDescriptor(this, 'stack');

    Object.defineProperty(this, 'stack', {
      get: () => {
        const stacktrace = stack.get.call(this);
        let causeStacktrace = '';

        for (const cause of causes) {
          if (cause.sourceStack) { // trigger lookup
            causeStacktrace += `\n${cause.sourceStack}`;
          } else if (cause instanceof Error) {
            causeStacktrace += `\n${cause.stack}`;
          } else {
            try {
              const json = JSON.stringify(cause, null, 2);
              causeStacktrace += `\n${json.split('\n').join('\n    ')}`;
            } catch (e) {
              causeStacktrace += `\n${cause}`;
              // ignore
            }
          }
        }

        causeStacktrace = causeStacktrace.split('\n').join('\n    ');

        return stacktrace + causeStacktrace;
      }
    });

    // access first error
    Object.defineProperty(this, 'cause', {value: () => causes[0], enumerable: false, writable: false});

    // untested; access cause stack with error.causes()
    Object.defineProperty(this, 'causes', {value: () => causes, enumerable: false, writable: false});
  }
}

Usage

throw new TraceError('Could not set status', srcError, ...otherErrors);

Output

Functions

TraceError#cause - first error
TraceError#causes - list of chained errors