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 to ensure Vitest global APIs are discoverable, addressing a common source of misconfiguration for TypeScript users. The update included a concrete tsconfig.json example, making the setup process more transparent and reducing onboarding friction. By aligning the documentation with TypeScript tooling expectations, Anaël’s work improved clarity for new and existing users, demonstrating attention to detail and a practical understanding of documentation as a key engineering skill.