'"react-scripts build" is updating my "jsx":"react" to "jsx":"react-jsx" in tsconfig.json file

When I run

react-scripts build

I get the following message :

The following changes are being made to your tsconfig.json file:
  - compilerOptions.jsx must be react-jsx (to support the new JSX transform in React 17)

However I do not have React 17. It is not installed, or in my package.json file.

The only thing I did was upgrade to React 17 a few days ago to play around with it, but then I reverted. Everything is back to 16.

Why does react-scripts think it should update my JSX?

create-react-app

Solution 1:^[1]

I just realised what the problem was.

I had a package.json file one level up from my actual project. It was there by accident. Inside the "parent" package.json I had React 17 defined.

package.json
|
|----- package.json

It seems like npm or CRA is behaving like Maven and trying to recursivley process build scripts up the folder tree.

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Source: Stack Overflow

Solution	Source
Solution 1	Oliver Watkins

'"react-scripts build" is updating my "jsx":"react" to "jsx":"react-jsx" in tsconfig.json file

Solution 1:[1]

Sources

Related Questions

Solution 1:^[1]