gruntfile.js

module.exports = function (grunt) {

    var gruntConfig = {
        concat: {
            options: {
                sourceMap: true
            },
            js: {
                src: [
                    'js/sources/Global/modules.js',
                    'js/sources/Global/ng-modules.js',
                    'js/sources/Global/ReferenceProvider.js',
                    'js/sources/Global/routes.js',
                    'js/sources/Filters/**/*.js',
                    'js/sources/Services/**/*.js',
                    'js/sources/Controllers/**/*.js',
                    'js/sources/Directives/**/*.js',
                ],
                dest: 'js/dist/combined.js'
            },
            css: {
                src: [
                    'css/sources/**/*.css'
                ],
                dest: 'css/dist/combined.css'
            }
        },
        babel: {
            angular: {
                options: {
                    sourceMap: true,
                    presets: [
                        "es2015"
                    ],
                    plugins: [
                        "syntax-async-functions",
                        "transform-regenerator"
                    ]
                },
                files: [
                    {
                        'js/dist/compiled.js': 'js/dist/combined.js'
                    }
                ]
            },
            processors: {
                options: {
                    sourceMap: true,
                    presets: [
                        "es2015"
                    ],
                    plugins: [
                        "syntax-async-functions",
                        "transform-regenerator"
                    ]
                },
                files: [
                    {
                        expand: true,
                        cwd: 'js/sources/Processors/',
                        src: ['*.js'],
                        dest: 'js/dist/Processors/'
                    }
                ]

            }
        },
        copy: {
            main: {
                files: [
                    {
                        expand: true,
                        cwd:'js/sources/Node-Modules/',
                        src: ['*.js'], 
                        dest: 'js/dist/Node-Modules/'
                    }
                ]
            },
        }
    };

    grunt.initConfig(gruntConfig);

    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-babel');

    grunt.task.registerTask("configureBabelSourceMap", "configures babel source map", function () {
        gruntConfig.babel.angular.options.inputSourceMap = grunt.file.readJSON('js/dist/combined.js.map');
    });

    grunt.registerTask('default', ['concat:js', 'concat:css', 'configureBabelSourceMap', 'babel', 'copy']);
};