Problem with Visual Studio Code using “react-jsx” as jsx value with create-react-app

问题

I'm struggling with following "error" in VSCode :

Argument for '--jsx' option must be: 'preserve', 'react-native', 'react'

Hence, react-scripts (create-react-app) automatically sets the jsx key to react-jsx value, when react value seems to work.

Actually, the code works perfectly and displays the page I want, but the IDE is underlining kinda everything as errors, saying :

Cannot use JSX unless the '--jsx' flag is provided.

Here is my tsconfig.json :

{
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": [
    "src"
  ]
}

, and my package.json (default one provided by create-react-app + packages updated) :

{
  "name": "front-office",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.11.6",
    "@testing-library/react": "^11.2.2",
    "@testing-library/user-event": "^12.2.2",
    "@types/jest": "^26.0.15",
    "@types/node": "^14.14.9",
    "@types/react": "^17.0.0",
    "@types/react-dom": "^17.0.0",
    "bootstrap": "^4.5.3",
    "react": "^17.0.1",
    "react-bootstrap": "^1.4.0",
    "react-dom": "^17.0.1",
    "react-scripts": "4.0.1",
    "typescript": "^4.1.2",
    "web-vitals": "^1.0.1"
  },
  "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"
    ]
  }
}

I'm using the latest version of Typescript, and I updated all my packages with ncu, closed/opened VSCode (works sometimes with tsconfig !) and nothing seems to resolve that.

I'm pretty sure it's a VSCode problem, but I'm running out of ideas about how to resolve that.

Any of you guys got ideas ?

回答1:

This is because VSCode's Typescript version is not using the newest babel features that create-react-app uses by default.

You can change VS Code to use the workspace's version of Typescript instead, which will fix this issue.

Open a TypeScript or JavaScript file and click on the TypeScript version number in the Status Bar. A message box will appear asking you which version of TypeScript VS Code should use

Select "Use Workspace Version" to use the newer Create React App typescript version.

回答2:

In PhpStorm (and the same is probably true for WebStorm) I got it to not complain about "react-jsx" as the value by ticking "Always download the most recent version of schemas" in Remote JSON Schemas.

回答3:

For the ones using VS 2019 I had to install typescript 4.1 for visual studio from here: https://marketplace.visualstudio.com/items?itemName=TypeScriptTeam.TypeScript-41

Then it worked fine by using the new jsx setting in the compilerOptions etc.

回答4:

If you are using VS Code and marksfrancis' answer didn't work for you. Maybe you should check your extensions for TypeScript, in my case the extension 'TypeScript God' was the cause I was still having this issue.

来源：https://stackoverflow.com/questions/64974648/problem-with-visual-studio-code-using-react-jsx-as-jsx-value-with-create-react