Portion of working Gruntfile.js

Gruntfile.js

grunt.initConfig({
         
         babel: {
            options: {
               sourceMap: false,
               presets: ['es2015']
            },
            core: {
               files: [{ expand: true, cwd: './', src: ['main.js', 'js/**/*.js'], dest: 'dist/'}]
            },
            scripts: {
               files: [
                  {
                     expand: true,
                     cwd: './',
                     src: [
                        'models/**/*.js',
                        'scriptmodels/**/*.js',
                        'scripts/**/*.js'
                     ],
                     dest: 'dist/'
                  }
               ]
            }
         },
         
         copy: {
            config: {
               files: [
                  { expand: true, src: ['config/**/*.json'], dest: 'dist/' },
                  { expand: true, src: ['data/**/*.json'], dest: 'dist/' }
               ]
            },
            views: {
               files: [{ expand: true, src: ['views/**/*.html'], dest: 'dist/'}]
            }
         },
         
         clean: {
            all: [
               'temp/*',
               '!temp/.gitignore',
               'trash/*',
               '!trash/.gitignore',
               'dist/*',
               '!dist/.gitignore',
            ]
         },
         
         exec: {
            gen: {
               cwd: './dist',
               cmd: function (platform, appName) {
                  console.log('node main.js "config/' + appName + '/' + platform + '/' + appName + '.json"');
                  return 'node main.js "config/' + appName + '/' + platform + '/' + appName + '.json"';
               }
            }
         },
         
         watch: {
            all: {
               files: [
                  'js/**/*.js',
                  'config/**/*.json', 
                  'data/**/*.json',
                  'views/**/*.html',
                  'scripts/**/*.js',
                  'scriptmodels/**/*.js'
               ],
               tasks: [
                  'babel:core', 
                  'babel:scripts',
                  'copy:config',
                  'copy:views'
               ]
            },
            core: {
               files: ['js/**/*.js'],
               tasks: ['babel:core']
            },
            config: {
               files: ['config/**/*.json', 'data/**/*.json'],
               tasks: ['copy:config']
            },
            html: {
               files: ['views/**/*.html'],
               tasks: ['copy:views']
            },
            scripts: {
               files: [
                  'models/**/*.js',
                  'scripts/**/*.js',
                  'scriptmodels/**/*.js'
               ],
               tasks: ['babel:scripts']
            }
         }
         
   });