Just chiming in to note that the codemod has already been released: https://github.com/reactjs/react-codemod#rename-unsafe-lifecycles https://github.com/reactjs

Just chiming in to note that the codemod has already been released: https://github.com/reactjs/react-codemod#rename-unsafe-lifecycles https://github.com/reactjs/react-codemod#rename-unsafe-lifec... We used it internally (at Facebook) several weeks ago to update ~14,000 components that used the unsafe lifecycles.