[core] Apply React 19 type changes that don't require upcoming @types/ packages
#42346
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Based on #42032
First step towards #42032
Summary
This PR includes the type changes we can implement without upgrading to the new
@types/packages (which is a WIP). It's achieved by:npx types-react-codemod@latest preset-19but skipping theuseRef-required-initialcodemod (See missing section below)npx types-react-codemod@latest react-element-default-any-propsto maintainReactElement's previous default.This results in the following changes:
JSXusage in favor ofReact.JSXReactElement<any>to retain the previous defaultMissing
The following are missing, to be implemented after DefinitelyTyped/DefinitelyTyped#69022 is merged:
useRef-required-initialcodemod yet. This is because it will be much easier with the newuseRef(undefined)overload that's coming.npx types-react-codemod@latest react-element-default-any-propsis provided, it is discouraged. We should eventually fix them to work with theunknowndefault.@emotion/react@11.11.4references deprecated global JSX namespace. They mention they'll work on it once React 19 is released. We could look into contributing to it.