Right way to extend Error

gistfile1.txt

var CustomError = function(message, anotherField) {
    this.message = message;
    this.anotherField = anotherField;

    if (Error.captureStackTrace) {
        Error.captureStackTrace(this, CustomError);
    } else {
        var e = new Error;
        this.fileName = e.fileName;
        this.lineNumber = e.lineNumber;
        this.stack = e.stack.split('\n').slice(1).join('\n')
    }
    

};
CustomError.prototype = Object.create(Error.prototype);
CustomError.prototype.name = 'CustomError';


// var e = new CustomError('olol');
// throw e;