ast-walker-scope is a tool for traversing Babel AST with scope information, built on top of estree-walker. It provides developers with access to scope data during AST traversal, making it useful for tasks like code analysis, refactoring, and building language tools that need to understand variable declarations and their scopes. The library is particularly valuable for developers working on Babel plugins, code transformation tools, or any application that needs to analyze JavaScript code structure with scope awareness.