Worked on the angular/angular-cli repository to deliver a feature focused on improving Vitest migration and configuration guidance. The approach involved consolidating migration documentation, updating migration warnings to reference vitest-base.config.ts, and clarifying test-runner options within the unit-test schema. By refining contributor-facing documentation and streamlining onboarding materials, the work aimed to reduce confusion and accelerate adoption of Vitest as a test runner. The implementation leveraged Angular, TypeScript, and JSON, with an emphasis on migration processes and unit testing practices. These changes provided a clearer migration path and enhanced the overall quality and accessibility of testing documentation for contributors.