css-tree
A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs and browser implementations
klaw
File system walker with Readable stream interface.
klaw-sync
Recursive, synchronous, and fast file system walker
node-source-walk
Execute a callback on every node of a source code's AST and stop walking when you see fit