Sample Gruntfile for personal reference

Gruntfile.js

module.exports = function(grunt) {

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    concat: {
      options: {
        separator: ';'
      },
      // Target(s)
      dist: {
        // Compact Format
        // src: ['src/**/*.js'],
        // dest: 'dist/<%= pkg.name %>.js'

        // Files Object Format
        // files: {
        //   'dist/<%= pkg.name %>.js': ['src/**/*.js'],
        //   'dist/plugins.js': ['src/**/*.js']
        // }

        // Files Array Format
        files: [
          { src: ['src/**/*.js'], dest: 'dist/<%= pkg.name %>.js'},
          { src: ['plugins/*.js'], dest: 'dist/plugins.js'}
        ]

      }
    },
    uglify: {
      options: {
        banner: '/*! <%= pkg.name %> <%= grunt.template.today("dd-mm-yyyy") %> */\n'
      },
      dist: {
        files: {
          'dist/<%= pkg.name %>.min.js': ['<%= concat.dist.dest %>']
        }
      }
    },
    qunit: {
      files: ['test/**/*.html']
    },
    jshint: {
      files: ['gruntfile.js', 'src/**/*.js', 'test/**/*.js'],
      options: {
        // options here to override JSHint defaults
        globals: {
          jQuery: true,
          console: true,
          module: true,
          document: true
        }
      }
    },
    watch: {
      files: ['<%= jshint.files %>'],
      tasks: ['jshint', 'qunit']
    }
  });

  // Load Plugins
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-concat');

  // Task Lists
  grunt.registerTask('test', ['jshint']);

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

};

package.json

{
  "name": "project-name",
  "version": "0.1.0",
  "devDependencies": {
    "grunt": "~0.4.1",
    "grunt-contrib-jshint": "~0.6.0",
    "grunt-contrib-nodeunit": "~0.2.0",
    "grunt-contrib-uglify": "~0.2.2",
    "grunt-jekyll": "~0.3.9",
    "grunt-contrib-concat": "~0.3.0"
  }
}