`@11ty/dependency-tree` is a Node.js utility that generates an unordered array of local file dependencies for a given CommonJS JavaScript file, including all nested `require()` dependencies. It's designed for build tools like Eleventy to efficiently track file changes, ignoring `node_modules` and built-in modules by default, with optional control over including package names. This tool is ideal for developers building static site generators or build systems that need to monitor JavaScript file dependencies for rebuilds.