ES6 Inheriting Errors

BetterError.es6

// Making this a global and not exporting because Meteor
BetterError = class extends Error {
  constructor(message, details) {
    var stack = super().stack;
    this.stack = stack;
    this.message = message;
    if (typeof details === 'object') {
      details = JSON.stringify(details);
    }
    this.details = details;
  }
}