I am trying to create-react-app with typescript, but there seems to be a problem with JSX and TS. I read a couple of possible solutions, that didn't work out for me.
I have:
- npm: version 16.14.7
- node: version 14.8.0
I used npx create-react-app my-app --template typescript from the docs
The installation went fine, but when I try to run npm start it gives me this error:
> my-app@0.1.0 start /Users/lukasbenediktson/Desktop/react-types/my-app
> react-scripts start
/Users/lukasbenediktson/Desktop/react-types/my-app/node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js:239
appTsConfig.compilerOptions[option] = value;
^
TypeError: Cannot assign to read only property 'jsx' of object '#<Object>'
at verifyTypeScriptSetup (/Users/lukasbenediktson/Desktop/react-types/my-app/node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js:239:43)
at Object.<anonymous> (/Users/lukasbenediktson/Desktop/react-types/my-app/node_modules/react-scripts/scripts/start.js:31:1)
at Module._compile (internal/modules/cjs/loader.js:1251:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1272:10)
at Module.load (internal/modules/cjs/loader.js:1100:32)
at Function.Module._load (internal/modules/cjs/loader.js:962:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
at internal/main/run_main_module.js:17:47
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-app@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-app@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
I tried to change this line 238 in node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js as suggested by tudor07 here:
} else if (parsedCompilerOptions[option] !== valueToCheck) {
to
} else if (parsedCompilerOptions[option] !== valueToCheck && option !== "jsx") {
and that let me run npm start and the server is up and running. But it now reveals that it won't recognize JSX/TSX:
TypeScript error in /Users/lukasbenediktson/Desktop/react-types/my-app/src/App.tsx(7,5):
Could not find a declaration file for module 'react/jsx-runtime'. '/Users/lukasbenediktson/Desktop/react-types/my-app/node_modules/react/jsx-runtime.js' implicitly has an 'any' type.
If the 'react' package actually exposes this module, consider sending a pull request to amend 'https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react` TS7016
5 | function App() {
6 | return (
> 7 | <div className="App">
| ^
8 | <header className="App-header">
9 | <img src={logo} className="App-logo" alt="logo" />
10 | <p>
My package.json looks like this:
{
"name": "my-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^5.11.4",
"@testing-library/react": "^11.1.0",
"@testing-library/user-event": "^12.1.10",
"react": "17.0.1",
"react-dom": "17.0.1",
"react-scripts": "4.0.0",
"typescript": "^4.0.3",
"web-vitals": "^0.2.4"
},
"devDependencies": {
"@types/jest": "^26.0.15",
"@types/node": "^12.0.0",
"@types/react": "^16.9.53",
"@types/react-dom": "^16.9.8"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": [
"react-app",
"react-app/jest"
]
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}
Thank you for your time.
UPDATE: SOLUTION (for me at least)
In my tsconfig.json I changed the my "compilerOptions": from "jsx": "react-jsx" to "jsx": "react". Notice that I still needed to make a change on line 238 in my node_modules/react-scripts/scripts/utils/verifyTypeScriptSetup.js as suggested by tudor07 here
Please let me know if it's too "hacky"
