gruntfile.js

module.exports = function (grunt) {
    grunt.initConfig({
        babel: {
            options: {
                // TODO These plugins might not be necessary
                plugins: [
                    /*
                    "transform-es2015-classes",
                    ["transform-builtin-classes", {
                        "globals": ["Array", "Error", "HTMLElement"]
                    }]
                    */
                ],
                
                presets: ["es2015"]
            },
            dist: {
                files: {
                    "./index.js": ["./src/index.js"]
                }
            }
        },
        watch: {
            scripts: {
                files: ["./src/**/*.js"],
                tasks: ["babel"]
            }
        }
    });

    grunt.loadNpmTasks("grunt-contrib-watch");
    grunt.loadNpmTasks("grunt-run");
    grunt.loadNpmTasks("grunt-babel");

    grunt.registerTask("default", ["watch"]);
    grunt.registerTask("build", ["babel"]);
};