create-react-app: Error when using new 'react-jsx' TypeScript transform

This is because VS Code the app hasn’t updated to typescript v4.1 yet which has support for the new jsx transform. To fix this you need to tell VS Code to use the Workspace version of typescript (v4.1.2).

EDIT: while this works, there is a simpler solution (see below) To fix this, while viewing a TS file, bring up the command pallet (cmd+shift+p) and type “select typescript version”, select the option and then select “Use Workspace Version 4.1.2”.

Side note, while CRA creates a package.json with "typescript": "^4.0.3", the actual installed version in node_modules is 4.1.2 (this should be fix by CRA as 4.0.3 is not compatible). So it probably makes sense to also update the typescript version in package.json.

Simpler solution: If you just update the TS version in package.json to 4.1.2, VS Code will automatically use the workspace version because it knows its internal TS version is not compatible with the project. This way you don’t end up with a .vscode/settings.json in your project.

As @asterikx pointed out, update package.json to:

"react-scripts": "^4.0.1",
"typescript": "^4.1.2"

@rafgraph thanks for the helpful tip! I can confirm the steps above fixed this.

VSCode also creates a project .vscode/settings.json file to control this setting, it might be useful to copy this into the repo when doing the setup, if it is a vscode specific setting.

{
  "typescript.tsdk": "node_modules/typescript/lib"
}

I have "react-scripts": "^4.0.1", "typescript": "^4.1.2"

Doing a react-scripts build changes my “jsx”: “react” to “jsx”: “react-jsx”, failing the build.

For the record, I have the same error with TS version 4.2.3

OS: Windows 10 VS Code: 1.54.3

package.json:

"react": "^17.0.1",
"typescript": "^4.2.3",
"react-scripts": "4.0.3"

tsconfig.json:

"module": "esnext",
"moduleResolution": "node",
"jsx": "react-jsx",
...
"include": [
    "src",
    "./src/**/*.tsx"
]

.vscode/settings.json:

"typescript.tsdk": "node_modules\\typescript\\lib"

VS Code -> Use Workspace Version -> 4.2.3

And I still get:

Error: Cannot use JSX unless the ‘–jsx’ flag is provided. ts(17004)

Restart VS Code or reopen project folder won’t fix the problem. The error is related to a new version of React because when I change to “jsx”: “react” the error disappears in VS Code. As You know CRA after build overrides tsconfig to original version “jsx”: “react-jsx” 🙂 so my question is simple:

Is there any official fix for this problem in VS Code with TypeScript version ^4.3.2 and React version ^17?

Same problem on WebStorms.

Any luck figuring it out?

@Cidrax this answer on SO worked for me with intellij based IDEs - https://stackoverflow.com/a/65090491

In IDE settings:

ticking “Always download the most recent version of schemas” in Remote JSON Schemas.

June 2021 and the problem still persists. I can’t develop any React app at all because of this, and I don’t see why CRA has to meddle with these configurations in the first place. PS I use Atom as my editor which does not add any own config file. I tried updating typescript and react-scripts to those specific suggested versions, but alas…

Adding this to tsconfig helped me.

  "include": [
    "./src/**/*.ts"
  ]

For me, it works after upgrading to "react-scripts": "^4.0.1":

"react-scripts": "^4.0.1",
"typescript": "^4.1.2"

Is there any update on this?

maybe not recommended, but I updated the node_modules file directly.

node_modules > react-scripts > scripts > utils > verifyTypeScriptSetup.js

changed around line 154:

hasJsxRuntime && semver.gte(ts.version, '4.1.0-beta') ? 'react' : 'react',

For those using Yarn Workspaces, you’ll have to nohoist or resolutions your typescript via your package.json. It works for me now.

{
  "name": "root",
  "version": "1.0.0",
  "private": true,
  "repository": "https://gitlab.com/foo-product/foo-root.git",
  "license": "MIT",
  "author": "Foo Bar <foobar@baz.com>",
  "main": "index.js",
  "workspaces": {
    "packages": [
      "packages/*"
    ],
    "nohoist": [
      "**/babel**",
      "**/eslint**",
      "**/jest**",
      "**/webpack**",
      "**/type-graphql**"
    ]
  },
  "scripts": {
    "postInstall": "lerna bootstrap"
  },
  "resolutions": {
    "graphql": "^15.3.0",
    "typescript": "^4.3.2"
  }
}

had to restart vs code to get it working after following the simpler solution.

Restarting the TS server from the command palette wasn’t enough

This is because VS Code the app hasn’t updated to typescript v4.1 yet which has support for the new jsx transform. To fix this you need to tell VS Code to use the Workspace version of typescript (v4.1.2).

EDIT: while this works, there is a simpler solution (see below) To fix this, while viewing a TS file, bring up the command pallet (cmd+shift+p) and type “select typescript version”, select the option and then select “Use Workspace Version 4.1.2”.

Side note, while CRA creates a package.json with "typescript": "^4.0.3", the actual installed version in node_modules is 4.1.2 (this should be fix by CRA as 4.0.3 is not compatible). So it probably makes sense to also update the typescript version in package.json.

Simpler solution: If you just update the TS version in package.json to 4.1.2, VS Code will automatically use the workspace version because it knows its internal TS version is not compatible with the project. This way you don’t end up with a .vscode/settings.json in your project.

As @asterikx pointed out, update package.json to:

"react-scripts": "^4.0.1",
"typescript": "^4.1.2"

This is an editor issue, and not specific to CRA from what i can tell. If you receive errors in npm start or npm run build, then you know you have an issue with CRA. The suggestion from https://github.com/facebook/create-react-app/issues/10144#issuecomment-733278351 should get you on the right path.