jest-watch-typeahead enhances Jest's interactive watch mode by adding typeahead functionality to filter tests. Instead of manually typing test names, users can leverage fuzzy searching to quickly find and run specific tests or suites. This improves developer workflow by reducing the time spent navigating large test suites, increasing efficiency when focusing on a subset of tests during development or debugging. It's customizable, allowing users to configure prompts and search filters to suit their project's needs.