Gruntfile.js

module.exports = function ( grunt ) {


	// Load the include-all library in order to require all of our grunt
	// configurations and task registrations dynamically.
	var includeAll = require( 'include-all' );

	grunt.initConfig( {
		pkg: grunt.file.readJSON( 'package.json' )
	} );

	/**
	 * Loads Grunt configuration modules from the specified
	 * relative path. These modules should export a function
	 * that, when run, should either load/configure or register
	 * a Grunt task.
	 */
	function loadTasks( relPath ) {
		return includeAll( {
				dirname: require( 'path' ).resolve( __dirname, relPath ),
				filter: /(.+)\.js$/
			} ) || {};
	}

	/**
	 * Invokes the function from a Grunt configuration module with
	 * a single argument - the `grunt` object.
	 */
	function invokeConfigFn( tasks ) {
		for ( var taskName in tasks ) {
			if ( tasks.hasOwnProperty( taskName ) ) {
				tasks[taskName]( grunt );
			}
		}
	}


	// Load task functions
	var taskConfigurations = loadTasks( './tasks/config' ),
		registerDefinitions = loadTasks( './tasks/register' );

	// (ensure that a default task exists)
	if ( ! registerDefinitions.default ) {
		registerDefinitions.default = function ( grunt ) {
			grunt.registerTask( 'default', [] );
		};
	}

	// Run task functions to configure Grunt.
	invokeConfigFn( taskConfigurations );
	invokeConfigFn( registerDefinitions );

};