A distribution is a set of bundles. Each bundle is a build of all BEM entities for a project platform.

dist/
├── desktop/
├── touch-phone/
└── touch-pad/

To learn how to build a bundle, read Building a bundle.

The project consists of three platforms:

• desktop — Includes the common.blocks and desktop.blocks levels.
• touch-phone — Includes the common.blocks, touch.blocks and touch-phone.blocks levels.
• touch-pad — Includes the common.blocks, touch.blocks and touch-pad.blocks levels.

Project file system:

.enb/
└── make.js          # The ENB config file
common.blocks/       # common level
desktop.blocks/      # desktop level
touch.blocks/        # common level for touch interfaces
touch-phone.blocks/  # touch pad level
touch-pad.blocks/    # touch phones level

To build a distribution from css and js for each platform, you need to:

1. Scan the platform levels and find all BEM entities in the project.

2. Generate a BEMDECL file from all BEM entities found on the platform levels (1).

3. Sort the list of BEM entities.

4. Get a list of files sorted by the list of BEM entities (3).

5. Use technologies to build css and js and declare targets.

   The ENB config file (.enb/make.js) will look like this:

   var techs = require('enb-bem-techs'),
    css = require('enb/techs/css'),
    js = require('enb/techs/js'),
    levels = {
        'desktop': ['common.blocks', 'desktop.blocks'],
        'touch-phone': ['common.blocks', 'touch.blocks', 'touch-phone.blocks'],
        'touch-pad': ['common.blocks', 'touch.blocks', 'touch-pad.blocks']
    },
    platforms = Object.keys(levels);

module.exports = function (config) { platforms.forEach(function(platform) { var node = path.join('dist', platform);

    // Configure a distribution build for a certain platform.
    // The `config.node` method creates the `dist/platform-name` directory,
    // if it doesn't exist yet.
    config.node(node, function(nodeConfig) {
        nodeConfig.addTechs([
            [techs.levels, {
                levels: levels[platform]  // (1) -> `?.levels`
            }],
            [techs.levelsToBemdecl],      // (2) `?.levels` -> `?.bemdecl.js`
            [techs.deps],                 // (3) `?.bemdecl.js` -> `?.deps.js`
            [techs.files],                // (4) `?.levels` + `?.deps.js` -> `?.files`

            [css],
            [js]
        ]);

        nodeConfig.addTargets(['?.css', '?.js']);
    }
}

};

6. Launch the build in the console:

```sh
$ enb make

7. Check the result.

   After the build, the dist directory is created with platform-specific project deliveries. A directory is created for each platform that contains css and js, along with the service files.

   .enb/
   common.blocks/
   desktop.blocks/
   touch.blocks/
   touch-phone.blocks/
   touch-pad.blocks/
   dist/
   ├── desktop/
           ...
       ├── desktop.css
       └── desktop.js
   ├── touch-phone/
           ...
       ├── touch-phone.css
       └── touch-phone.js
   └── touch-pad/
           ...
       ├── touch-pad.css
       └── touch-pad.js

You can build other necessary bundles in the same way, such as bundles of templates.