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Description
React version: 17.0.1
Steps To Reproduce
- npx create-react-app my-app
- cd my-app
- npm start (Works like a charm)
- npm run eject
- npm i
- npm start (ReferenceError: React is not defined)
Link to code example: https://codesandbox.io/s/ecstatic-wood-ou6px
The current behavior
I upgraded react to 17 and removed "import React"s from my project files (except index.js where react mounted). But I got "ReferenceError: React is not defined" in those files.
To investigate the issue behind this, I created a new react app, the new JSX transformation was working. But when I eject, it throws the same errors.
So;
Without react-scripts, new JSX transformation doesn't working.
The expected behavior
Components should render without declaring React (import React from "react") if React is in scope.
ap221882, miriamso and cfrancisco
Activity
kachkaev commentedon Oct 29, 2020
I guess that this issue should be moved to https://github.com/facebook/create-react-app
[-]Bug: React 17, React is not defined[/-][+][v4] Bug: React 17, React is not defined[/+][-][v4] Bug: React 17, React is not defined[/-][+][v4] Bug: React 17, React is not defined after ejecting[/+]alpeer commentedon Oct 29, 2020
This is not an issue about create-react-app.
I don't use create-react-app in the project I had problem with jsx-transformation.
I have just mention to show you example and give more idea about issue.
Thanks for replying quickly.
Happy coding :)
mordechaim commentedon Oct 29, 2020
I'm having this exact issue even without ejecting. I followed the migration guide, ran react-codemod, deleted node_modules.
The compiler says the code compiled successfully but getting the red screen in the browser.
n3tr commentedon Nov 1, 2020
@alpeer
Upgrade React 17 and remove
import React
statements won't work since React doesn't do any JSX transform, you need babel plugin for that (https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html#manual-babel-setup).the CRA ejection issue has been fixed in #9885 and needs to wait for the maintainer to publish a new version.
:)
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