The fast file transform pipeline.
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The fast file transform pipeline. Build Status

George Jetson's workweek is typical of his era: an hour a day, two days a week. His boss is Cosmo Spacely, the diminutive yet bombastic owner of Spacely Space Sprockets. Spacely has a competitor, H. G. Cogswell, owner of the rival company Cogswell Cogs (sometimes known as Cogswell's Cosmic Cogs).


npm install cogs


Cogs leverages a simple command line interface paired with a powerful declarative config file.

Usage: cogs [options]


  -h, --help                output usage information
  -V, --version             output the version number
  -c, --config-path [path]  load config from [path] [default cogs.js]
  -d, --dir [path]          run in [path] instead of current directory
  -w, --watch [path]        build when [path] changes, can be specified multiple times
  -p, --use-polling         use stat polling instead of fsevents
  -s, --silent              do not output build information, only errors
  -C, --no-color            disable colored output


Every good project needs a Cogs config file. This file can be JavaScript or JSON, as long as requireing the file returns the config object. Here's an example in JavaScript (mainly so comments can be added in this case):

module.exports = {

  // Define the transformer pipeline here.
  transformers: [
      // This is the name of the transformer to use for this piece of the
      // pipeline. It can be shorthand like this, or the fully-qualified package
      // name like 'cogs-transformer-babel'.
      name: 'babel',

      // The "only" key can be used to define a glob or array of globs, one of
      // which must be matched for the file to go through this transformer.
      only: 'src/**/*.js',

      // "except" is the opposite of only. Paths that match these globs will not
      // go through the transformer.
      except: [

      // "options" will be passed directly to the transformer.
      options: {
        presets: ['stage-0', 'es2015', 'react']

    // Impromptu transformers are as easy as specifying a function.
      fn: ({file: {buffer}, options}) => ({buffer: Buffer.from(`${buffer}!`)),
      only: '**/*.exciting'

    // Some other examples...
      name: 'uglify-js',
      only: '**/*.js',
      except: '**/*+(-|_|.)min.js'
      name: 'sass',
      only: 'src/**/*.scss'
      name: 'clean-css',
      only: '**/*.+(css|scss)'

  // Define source globs and targets here. This is where you define what to
  // transform and where it should go.
  builds: {
    'src/index.es6': 'public/index.js',

    'src/public/**/*': {dir: 'public'},

    // Save to public dir and rename .es6 files to .js
    'src/foo/**/*': {
      dir: 'public',
      ext: {
        '.es6': '.js'


Transformers are generally node modules that can be downloaded from npm. Alternatively, you can create your own transformers for your projects and reference them in the transformers array.

Here are some transformers to get you started


git clone
cd cogs