Worked on the storybookjs/storybook repository to enhance ES Module compatibility in the distribution build process. Addressed a packaging issue by updating the build tooling and scripting to ensure all nested JavaScript files within the dist directory were correctly identified and renamed to .mjs, aligning with modern ES Module standards. Utilized TypeScript and build tools to refine the tsc.ts glob pattern, enabling comprehensive compilation and inclusion of nested module files. This change improved downstream compatibility for consumers relying on ES Modules, reducing runtime import errors and streamlining integration with modern bundlers. Demonstrated focused problem-solving within a short project period.