Concat and encase in an anonymous function to export any variable or encase within a AMD module.
Test every possible individual files and variables can be selected to be published at release file.

Install this grunt plugin next to your project's with: npm install grunt-encase
Then add this line to your project's Gruntfile.js Gruntfile:

grunt.loadNpmTasks('grunt-encase');

For information about installing the Grunt, please see here
http://gruntjs.com/getting-started

src1.js

// Does not need to be wrapped in an anonymous function.
var hoge = 'hogehoge';
...

src2.js

// Does not need to be wrapped in an anonymous function.
var piyo = 'piyopiyo';
...

dest.js

(function(s, undefined) {
  // concat src1.js and src2.js
  var hoge = 'hogehoge';
  ...
  var piyo = 'piyopiyo';
  ...
  
  // export variable can select with option.
  module.exports = {hoge: hoge, piyo: piyo}; // if enviroment is 'browser', window = {...}
})(someVariable);

You'll need to install grunt-encase first:

npm install grunt-encase

Then modify your Gruntfile.js file by adding the following line:

grunt.loadNpmTasks('grunt-encase');

Then add some configuration for the plugin like so:

grunt.initConfig({
    ...
    grunt.initConfig({
      encase: {                         // Task
        develop: {                      // Target
          separator: '\n',              // Concat Separator
          enviroment: 'browser',        // Target Enviroment ('node' or 'browser')
          useStrict: true,              // 'use strict'
          banner: '<%= meta.banner %>', // Optional Banner
          exports: ['hoge', 'piyo'],    // Export Variables (string expression or variable names array)
          params: {"window": "w"},      // Params passed into anonymous function, key/value represents ... 
                                        // ... how they will be utilized in the function call argument vs function argument		   
          src: 'src/*.js',              // source (string expression or filenames array)
          dest: 'dest/build.js'         // destination
        }
      }
    });
    ...
});

Then just run grunt encase and enjoy!

The file content can be encased in a AMD Module by specifying "defines" attribute in the initConfig like below.

grunt.initConfig({
    ...
    grunt.initConfig({
      encase: {                         // Task
        develop: {                      // Target
          separator: '\n',              // Concat Separator
          enviroment: 'browser',        // Target Enviroment ('node' or 'browser')
          banner: '<%= meta.banner %>', // Optional Banner              
          exports: ['hoge', 'piyo'],    // Export Variables (string expression or variable names array)
          defines: {
            "jquery": "$",              // Params to be used in constructing the AMD 'define' function
            "backbone": "bb"
          },
          src: 'src/*.js',              // source (string expression or filenames array)
          dest: 'dest/build.js'         // destination
        }
      }
    });
    ...
});

• 0.0.1 - initial release with a minimum feature
• 0.0.2 - added support for Grunt v0.4.x
• 0.0.3 - added support banner and useStrict option
• 0.1.0 - added support auto exports amd-style or tranditional window-style in browser
• 0.2.0 - dependency plugin version up and fixed some bug

Copyright (c) 2012-2015 Kokudori Licensed under the MIT license.