What version of React does Gutenberg use?

WordPress 5.1.1 uses React 16.6.3. You can see this in the package.json file in the development version of WordPress on Trac: https://core.trac.wordpress.org/browser/tags/5.1.1/package.json?rev=44861

This has already been updated in trunk to 16.8.4, so the next major version of WordPress will use at least that version.

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