why is.js require itself

[BoltDoggy]

why is.js require itself.

if(typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define(['is'], function(is) {
        // Also create a global in case some scripts
        // that are loaded still are looking for
        // a global even when an AMD loader is in use.
        return (root.is = factory(is));
    });
} else if(typeof exports === 'object') {
    // Node. Does not work with strict CommonJS, but
    // only CommonJS-like enviroments that support module.exports,
    // like Node.
    module.exports = factory(require('is_js'));
} else {
    // Browser globals (root is window)
    root.is = factory(root.is);
}

[rubenspgcavalcante]

Related to #100, problems with circular dependency

[arasatasaygin]

This issue is resolved with #138