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undef – builder for AMD JavaScript projects

undef is a builder for AMD based JavaScript projects. It strips define calls from the source files and combines all modules into a single file.

undef is alpha software and not yet ready for use in production systems.


undef can be installed with npm.

npm install -g undef

Current Capabilities and Limitations

undef can currently build a project of AMD modules, where each module is in an own file, and each file contains only the module definition (define(…);). Source comments are ok. Only anonymous modules are supported at the moment.

There is no support for the special dependencies “require”, “module” and “exports” yet.


Basic invocation

Uses “entry/module” as entry point and resolves all dependencies. The resulting source code is written to stdout.

undef entry/module


  • -d/--basedir DIR – the base path to use for module resolution. Defaults to the current working directory.

  • -p/--paths PATHS – paths for individual modules. Accepts a comma-separated list of mappings, e.g. -paths=foo=else/where,bar/baz=somewhere/else. Paths are resolved relative to the current working directory, not to --basedir. This is different from require.js.

  • -o/--output FILE write output to this file instead of stdout.

Plans and TODOs

  • Expose a usable API for common functionality.
  • Support multiple modules per file (and in consequence, named modules).
  • Support special “require”, “module” and “exports” dependencies.
  • Simplified CommonJS wrapping.
  • Pre-load files containing module definitions.
  • Post-process r.js builds – useful for buildable plugins like “text”.
  • Pass the amd test suite as far as possible (using a special browser build).

Not In Scope

The following things are not in the scope of this project:

  • Minification – just pipe through the minifier of your choice.
  • AMD plugin support – this will be covered by processing r.js builds.


A builder for AMD JavaScript projects