usps-webtools/src/error.js

Api wrapper for the USPS Web-Tools

/**
    Custom USPS Webtools error
    Inspiration: http://www.devthought.com/2011/12/22/a-string-is-not-an-error/

    Examples:
        new USPSError('Error Message');
        new USPSError('Error Message', err);

    If creating an error instance with a string, note that the stack trace will be that of where the error was initialized
    If extending a native error (by passing it as second argument) then trace will be accurate, keys copied over, and original message & name will be copied to the 'original' attribute
    If extending a non-native error (string or object) then the result will be similar to the first case, but the 'original' attribute will be equal to the non-native error

    @param {String} msg The relevant error message
    @param {Error|String|Object} [original] The original error being extended
*/
class USPSError extends Error {
  constructor(message, ...additions) {
    super(message);

    // addition should be an {} obj (possibly an Error)
    for (let addition of additions) {
      for (let key in addition) {
        this[key] = addition[key];
      }
    }

    this.name = 'USPS Webtools Error';
    this.message = typeof message === 'string' ? message : 'An error occurred';
  }
}

module.exports = USPSError;