* Helper function which reverses the sense of predicate result * @param {*} func * @returns

* Expose request IP as a middleware. * * @param {object} [options] - Configuration. * @param {string} [options.attributeName] - Name of attribute t

* Replaces is.existy from is_js. * @param {*} value - The value to test * @returns {boolean} True if the value is defined, otherwise false

* Determine client IP address. * * @param req * @returns {string} ip - The IP address if known, defaulting to empty string if unknown.

* Parse x-forwarded-for headers. * * @param {string} value - The value to be parsed. * @return {string|null} First known IP address, if any.

* Create a new server for each test so we can easily close it after the test is done. * This prevents tests from hanging and competing against closin

* Replaces is.ip from is_js. * @param {*} value - The value to test * @returns {boolean} True if the value is an IP address, otherwise false

* Replaces is.object from is_js. * @param {*} value - The value to test * @returns {boolean} True if the value is an object, otherwise false

* Replaces is,.string from is_js. * @param {*} value - The value to test * @returns True if the value is a string, otherwise false