gistfile1.js

module.exports = function(grunt) {
  grunt.initConfig({
    clean: ['public/js/'],
    type: {
      'default': {
        files: [
          {
            src: 'public/ts/app.ts',
            dest: 'public/js/app.js'
          }
        ],
        options: {
          sourcemap: true,
          target: 'es5'
        }
      }
    },
    useminPrepare: {
      html: 'public/index.dev.html',
      dest: 'public/index.html'
    },
    usemin: {
      html: 'public/index.html'
    },
    watch: {
      files: ['public/ts/**/*.ts'],
      tasks: ['type']
    }
  });

  grunt.registerTask('default', [
    'clean',
    'type',
    'useminPrepare',
    'concat',
    'uglify',
    'usemin',
    'watch'
  ]);

  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-type');
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-usemin');
  //grunt.loadNpmTasks('grunt-karma');
};