During August 2025, Sinatra enhanced the storybookjs/storybook repository by developing robust TypeScript CSF parsing capabilities. Focusing on the CSF-tools parser, Sinatra implemented support for TypeScript’s satisfies and as type assertions, enabling accurate interpretation of advanced type constructs in story and meta definitions. The work involved extending code parsing logic and introducing comprehensive tests to validate parsing across various satisfies and as combinations, ensuring metadata extraction remained reliable. Utilizing JavaScript, TypeScript, and testing frameworks, Sinatra’s contributions improved the reliability of CSF tooling for TypeScript-powered stories, reducing downstream parsing errors and deepening the parser’s compatibility with modern TypeScript features.