Worked on the Shopify/extensions-templates repository to enhance the developer experience by refining Vitest watch mode for JavaScript projects. Delivered a cross-file Vitest configuration that enables force rerun triggers for both test and source files, directly addressing the need for faster feedback cycles and more reliable test execution. Focused on configuration management and testing, the approach reduced flaky test runs and improved the stability of local and CI environments. Leveraged JavaScript and Vitest tooling to streamline the PR validation process, resulting in quicker iteration and higher quality releases. No major bug fixes were reported during this period, emphasizing feature delivery.