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Creating custom Error objects in Node.js

Sometimes you want to wrap error objects with application-specific errors for your stack traces.

Your custom error constructor:

function CustomError(e, extra) {
  Error.call(this);
  Error.captureStackTrace(this, CustomError);
  this.id = e.id;
  this.name = 'CustomError';
  this.message = e.message
}

require('util').inherits(CustomError, Error);

Example usage:

function doWork(callback) { doErrorProneWork(funtion(err, result) { if (err) return callback(new CustomError(err));

  ...
}

}

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