adjust-sourcemap-loader is a webpack loader that modifies source maps generated by previous loaders. It corrects inconsistencies or errors that can arise during webpack's module transformation process. By adjusting source map locations, it ensures accurate debugging and error tracing in browser developer tools. It is particularly useful when dealing with loaders that don't perfectly maintain source map fidelity, improving the overall debugging experience during frontend development and streamlining the identification of original source code locations.