defs

Transforms ES6 const and let to ES3 var with semantic accuracy, as shown in examples where inner variables are renamed (e.g., y to y$0) to avoid scope conflicts.

Serves as a linter to detect scoping errors like duplicated definitions or unknown references, configurable via defs-config.json with options like disallowDuplicated.

Supports environment definitions (e.g., node, browser) and global variable settings borrowed from jshint, allowing customization for different project setups.

Can be used as a Node.js library to process code strings or ASTs, enabling integration into custom build tools and scripts, as documented in the README.