Greg Westneat updated the ts-transformer documentation in the formatjs/formatjs repository to ensure compatibility with ts-jest v29 and above. He restructured the example configuration, moving ts-jest settings under the transform key to match the latest ts-jest structure, which helps teams integrate ts-transformer with newer versions more reliably. Focusing on configuration and documentation, Greg clarified integration steps and reduced the risk of setup errors, making onboarding and upgrades smoother for JavaScript developers. His work addressed the evolving requirements of CI and development environments, providing clear, accurate guidance for teams adopting or upgrading ts-transformer in their testing workflows.