function newError(name) {

    function CustomError(message, properties) {

        if (!(this instanceof CustomError))
            return new CustomError(message, properties);

        // Error.call(this, message);
        // ^ just returns a new error instance because the ctor can be called as a function

        Object.defineProperty(this, "message", { get: function() { return message; } });

        /* istanbul ignore next */
        if (Error.captureStackTrace) // node
            Error.captureStackTrace(this, CustomError);
        else
            Object.defineProperty(this, "stack", { value: (new Error()).stack || "" });

        if (properties)
            merge(this, properties);
    }

    (CustomError.prototype = Object.create(Error.prototype)).constructor = CustomError;

    Object.defineProperty(CustomError.prototype, "name", { get: function() { return name; } });

    CustomError.prototype.toString = function toString() {
        return this.name + ": " + this.message;
    };

    return CustomError;
}
Creates a custom error constructor.
@memberof util
@param {string} name Error name
@returns {function} Custom error constructor