Anaël Chardan enhanced the developer experience for the vitest-dev/vitest repository by updating its documentation to clarify TypeScript’s typeRoots configuration. Focusing on Markdown-based documentation, Anaël provided explicit guidance on including node_modules in typeRoots, ensuring that Vitest’s global APIs are properly discoverable by TypeScript users. The update included a concrete example tsconfig.json, helping developers avoid common misconfigurations and streamlining onboarding for new users. By addressing a subtle but impactful configuration detail, Anaël’s work reduced setup friction and improved alignment with TypeScript tooling expectations. The contribution demonstrated attention to detail in documentation and a practical understanding of TypeScript and developer workflows.