Solving React 18 breaking changes when upgrading projects with Theia 1.29.0.
summary
The Theia Trace Extension cloud version breaks when Theia 1.29.0 brings React 18: three different React versions appear across packages, createRoot must replace old roots, and yarn why plus a resolutions block in package.json forces a single React. TypeScript needs explicit children types, automatic batching changes require selective use of flushSync from react-dom, and tests move off Enzyme to React Testing Library. After those fixes the upgrade succeeds.
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