Optimizing multiple files with grunt via grunt-contrib-requirejs: http://blog.clintconklin.com/optimizing-multiple-javascript-files-with-grunt-and-requirejs/

gistfile1.txt

module.exports = function(grunt) {
	var matches = grunt.file.expand('scripts/template-scripts/**/index.js');

	var requirejsOptions = {};
	if (matches.length > 0) {
		for (var x = 0; x < matches.length; x++) {
			var path = matches[x].replace(/\/index\.js/, '');
			requirejsOptions['task' + x] = {
				"options": {
					"baseUrl": "./",
					"wrap": true,
					"name": path + "/index",
					"out": path + "/index.min.js",
					"optimize": "uglify2",
					"uglify2": {
						"mangle": false
					},
					"generateSourceMaps": true,
					"preserveLicenseComments": false,
					"done": function(done, output) {
						done();
					}
				}
			};
		}
	}

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

	grunt.loadNpmTasks('grunt-contrib-requirejs');
	grunt.registerTask('default', ['requirejs']);
};

I'd use the reduce instead of for loop and drop the unnecessary if statement:

module.exports = function (grunt) {
    var matches = grunt.file.expand('scripts/template-scripts/**/index.js');

    var requireJsOptions = matches.reduce(function (acc, match, index) {
        var path = match.replace(/\/index\.js$/, '');

        acc['task' + index] = {
            options: {
                baseUrl: './',
                wrap: true,
                name: path + '/index',
                out: path + '/index.min.js',
                optimize: 'uglify2',
                uglify2: {
                    mangle: false
                },
                generateSourceMaps: true,
                preserveLicenseComments: false,
                done: function (done, output) {
                    done();
                }
            }
        };
    }, {});

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

    grunt.loadNpmTasks('grunt-contrib-requirejs');
    grunt.registerTask('default', [ 'requirejs' ]);
};