babel-plugin-preval is a Babel plugin that enables pre-evaluation of code at build-time, allowing developers to perform dynamic operations like reading the filesystem or executing computations before runtime. It's particularly useful for generating static values from dynamic sources, such as reading file contents or processing data that's only available during the build process. The plugin is designed for JavaScript developers who want to optimize their applications by moving certain computations to build-time, especially those working with Node.js and Babel in their development workflow.