docs: function kwire(appRoot, globalShadow) {
  		appRoot = appRoot == null ? {} : appRoot;
  		globalShadow = globalShadow || window;
  
  		if (typeof appRoot !== 'object') {
  			throw 'root object must be an object.'
  		}
  
  		if (isServerSide() ||
  			isUsingRequireJS() ||
  			rootIsAlreadyConfigured(globalShadow)) {
  			return;
  		}
  
  		globalShadow.module = {
  			set exports(value) {
  				if (value === undefined) {
  					throw 'module not defined.';
  				}
  				if (value === null) { // null or undefined.
  					return;
  				}
  				if (!value.hasOwnProperty('_path_')) {
  					throw '_path_ own-property must be present on modules registered with kwire.';
  				}
  
  				if (typeof value._path_ !== 'string') {
  					throw '_path_ own-property must be a string.';
  				}
  
  				appRoot[value._path_] = value;
  			}
  		};
  
  		/**
  		 * cb is optional.
  		 */
  		globalShadow.require = function(value, cb) {
  			var valueIsArray = Array.isArray(value);
  			if (value == null) {
  				throw 'value not defined.'
  			}
  			if (typeof value !== 'string' && !valueIsArray) {
  				throw 'value must be a string or an array.'
  			}
  
  			if (cb) {
  				if (!valueIsArray) {
  					return cb(appRoot[value]);
  				}
  
  				return cb.apply(null, value.map(function(v) {
  					return appRoot[v];
  				}));
  			}
  
  			var result = appRoot[value];
  
  			return result === undefined ? globalShadow[camelify(value)] : result;
  		};
  
  	}