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This has been made possible through the type definitions at Definitely Typed, a repository for high quality TypeScript type definitions. It's particularly down to the fine work of Sebastian Silbermann, who has put a lot of work into the React 18 definitions.
Before we do that, let's first consider the problem of Definitely Typed and semantic versioning.
It's important to note that npm is built on top of semantic versioning. To make consumption of type definitions easier, the versioning of a type definition package will seek to emulate the versioning of the npm package it supports. So for react 18.0.0, the corresponding type definition would be @types/react's 18.0.0.
Of the above, the removal of implicit children is the most breaking of the changes and Sebastian wrote a blog post to explain the rationale. He was also good enough to write a codemod to help.
To demonstrate what upgrading looks like, I'm going to upgrade my aunt's website. It's a fairly simple site, and the pull request for the upgrade can be found here.
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