Commoner makes it easy to write scripts that flexibly and efficiently transpile any dialect of JavaScript into a directory structure of Node-compatible CommonJS module files.

This task is made possible by 1. a declarative syntax for defining how module source code should be found and processed, 2. the use of [promises](https://github.com/kriskowal/q) to manage an asynchronous build pipeline, and 3. never rebuilding modules that have already been built.

The output files can be required seamlessly by Node, or served by any static file server, or bundled together using a tool such as Browserify, WrapUp, or Stitch for delivery to a web browser.