[React 19]JSX asking that I should declare react at the top of the file about react

[eps1lon]

Your build setup is using the classic JSX runtime that still requires a React import at the top.

It doesn't look like this bug report has enough info for one of us to reproduce it.

Please provide a CodeSandbox (https://react.new), or a link to a repository on GitHub.

Here are some tips for providing a minimal example: https://stackoverflow.com/help/mcve

[prayag2002]

If you're using React 19 canary and encountering an error that asks for the React import at the top of your files, it is likely related to TypeScript's configuration. React 18 introduced the automatic JSX runtime, eliminating the need to import React manually. Ensure your tsconfig.json has "jsx": "react-jsx" under compilerOptions. This is not a new requirement but a configuration issue. Adjusting your TypeScript settings should resolve the error.
Feel free to correct.

[jetro4u]

If you're using React 19 canary and encountering an error that asks for the React import at the top of your files, it is likely related to TypeScript's configuration. React 18 introduced the automatic JSX runtime, eliminating the need to import React manually. Ensure your tsconfig.json has "jsx": "react-jsx" under compilerOptions. This is not a new requirement but a configuration issue. Adjusting your TypeScript settings should resolve the error. Feel free to correct.

I already did set '"jsx": "react-jsx"' and even tried "jsx": "preserve" before I ask the question