TypeError: Cannot assign to read only property 'jsx' of object '#<Object>'

[neonise]

when i want to use typescript template then npm start get this error.
i know this is duplicate .
but i think this error is important to solve.

[ragnarok1998]

[ragnarok1998]

reference
#9868

[neonise]

i have the error yet.
no affected

[FelHa]

I'm getting the same error. After installing unmet peer dependencies and changing the tsconfig.json the errors are gone. See:
https://stackoverflow.com/questions/64932747/yarn-create-react-app-with-typescript-throwing-errors

[HashemKhalifa]

I have the same issue, you can override it by removing the tsconfig.json and run yarn start will populate a new tsconfig.json and will work!
P.S you can't modify the tsconfig.json file!

there's a solution for this #9868 (comment)

[jjavierdguezas]

I have the same issue, you can override it by removing the tsconfig.json and run yarn start will populate a new tsconfig.json and will work!
P.S you can't modify the tsconfig.json file!

this work, thanks

[neonise]

'cp' is not recognized as an internal or external command

[neonise]

'yarn' is not recognized as an internal or external command

[ghost]

I have the same issue, you can override it by removing the tsconfig.json and run yarn start will populate a new tsconfig.json and will work!
P.S you can't modify the tsconfig.json file!

there's a solution for this #9868 (comment)

This is only works once. If you stop the server and restart it throws the same error. Seems to be an issue with Typescript itself or the way CRA handles the tsconfig file, not sure. I did a rollback to v4.0.5 and changed the jsx option to react and it works fine.

package.json

+"typescript": "^4.0.5",
-"typescript": "^4.1.2",

tsconfig.json

+"jsx": "react"
-"jsx": "react-jsx"

[ghost]

Can be closed. Fixed in in release react-scripts@4.0.1

[neonise]

i am confused.
what should i do now to fix?
should i run create-react-app again?

[jonathaningersoll]

I had this issue until I

1. updated my react-scripts to 4.0.1
2. updated my typescript version to 4.1.2
3. updated my package.json to reflect the changes
4. ran npm start - no errors.

After updating, I didn't even have to re-generate my tsconfig.json