configuration

requirejs: {
	almond: true,
	replaceRequireScript: [{
		files: ['index.php'],
		modulePath: '/js/main-built'
	}],
	wrap: true,
	baseUrl: "js",
	paths: {
		'hbs': 'libs/hbs',
		'Handlebars': 'libs/Handlebars',
		'Backbone': 'libs/backbone',
		'underscore': 'libs/underscore',
		'bootstrap': 'libs/bootstrap',
		'json2': 'libs/json2',
		'Rickshaw': 'libs/rickshaw',
		'validate': 'libs/jquery.validate'
	},
	hbs: {
		templateExtension : 'hbs',
		stylesDir : '/static/css/',
		disableI18n: true
	},
	pragmasOnSave: {
		excludeHbsParser: true,
		excludeHbs: true,
		excludeAfterBuild: true
	},
	modules: [{name: 'main'}],
	out: "js/main-built.js",
	uglify: {
		except: ["$super"]
	}
}

with modules

~/dev/console [git:development+] $ grunt build
Running "requirejs" task
>> RequireJS optimizer started
>> Including almond.js
Error: If the "modules" option is used, then there should be a "dir" option set and "out" should not be used since "out" is only for single file optimization output.
    at Function.createConfig (/Users/jza/dev/console/node_modules/grunt-requirejs/node_modules/requirejs/bin/r.js:16178:19)

without modules

~/dev/console [git:development+] $ grunt build
Running "requirejs" task
>> RequireJS optimizer started
>> Including almond.js

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
TypeError: Cannot call method 'forEach' of undefined
    at Object.<anonymous> (/Users/jza/dev/console/node_modules/grunt-requirejs/tasks/require.js:192:29)
    at Task.helper (/Users/jza/dev/console/node_modules/grunt/lib/util/task.js:117:19)
    at Object.helper (native)
    at Object.<anonymous> (/Users/jza/dev/console/node_modules/grunt-requirejs/tasks/require.js:72:11)
    at Object.<anonymous> (/Users/jza/dev/console/node_modules/grunt/lib/grunt/task.js:56:16)
    at Task.<anonymous> (/Users/jza/dev/console/node_modules/grunt/lib/util/task.js:341:36)
    at Task.<anonymous> (/Users/jza/dev/console/node_modules/grunt/lib/util/task.js:317:9)
    at Task.<anonymous> (/Users/jza/dev/console/node_modules/grunt/lib/util/task.js:344:11)
    at Task.start (/Users/jza/dev/console/node_modules/grunt/lib/util/task.js:357:5)
    at Object.tasks (/Users/jza/dev/console/node_modules/grunt/lib/grunt.js:143:8)