TS17004

error TS17004: Cannot use JSX unless the ‘–jsx’ flag is provided.

Broken Code ❌

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function App() {
  return <p>My App!</p>;
}

export default App;

Fixed Code ✔️

You have to add a configuration for “jsx” to your “tsconfig.json” file:

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{
  "compilerOptions": {
    "jsx": "react"
  }
}