Gruntfile.js

var webpackDevConfig = require("./webpack.config");
var webpackDistConfig = require("./webpack.config.dist");

module.exports = function(grunt) {
  require('load-grunt-tasks')(grunt);

  var pkgConfig = grunt.file.readJSON('package.json');

  grunt.initConfig({
    pkg: pkgConfig,

    webpack: {
      options: webpackDistConfig,
      dist: {
        cache: false
      }
    },

    'webpack-dev-server': {
      options: {
        hot: false,
        port: 8000,
        webpack: webpackDevConfig,
        publicPath: '/assets/',
        contentBase: './<%= pkg.src %>/'
      },

      start: {
        keepAlive: true
      }
    },
    copy: {
      dist: {
        files: [
          // includes files within path
          {
            flatten: true,
            expand: true,
            src: ['<%= pkg.src %>/*'],
            dest: '<%= pkg.dist %>/',
            filter: 'isFile'
          },
          {
            flatten: true,
            expand: true,
            src: ['<%= pkg.src %>/images/*'],
            dest: '<%= pkg.dist %>/images/'
          }
        ]
      }
    },

    clean: {
      dist: {
        files: [{
          dot: true,
          src: [
            '<%= pkg.dist %>'
          ]
        }]
      }
    }
  });

  grunt.registerTask('build', ['clean', 'copy', 'webpack']);

  grunt.registerTask('default', []);

};