Demo Gruntfile

gruntfile.js

module.exports = function(grunt) {
  
  grunt.initConfig({
    jshint: {
      all: 'web_static/js/development/**/*.js'
    },
    concat: {
      scripts: {
        src: 'web_static/js/development/**/*.js',
        dest: 'web_static/js/production/app.js'
      }
    },
    uglify: {
      all: {
        src: '<%= concat.scripts.dest %>',
        dest: 'web_static/css/production/app.min.js'
      }
    }
  });
  
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-copy');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  
  grunt.registerTask('default', [
    'jshint',
    'concat',
    'uglify'
  ]);
};