Catty is the source file concatenator for Mapshaper.

Some features: * Each source file lists its dependencies in a formatted comment. There is no manifest, unlike some other tools. * Concatenated files are (optionally) wrapped in a self-executing function, to protect the global namespace. * Catty can monitor source files and regenerate output files when a required source file changes.

Node.js is an event-based server-side JavaScript engine.