Warning: React.jsx: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

[blockmood]

package.json

"@types/jest": "^27.0.1",
    "@types/node": "^16.7.13",
    "@types/react": "^18.0.0",
    "@types/react-dom": "^18.0.0",
    "antd": "^4.22.4",
    "react": "^18.2.0",

App.tsx

const Home = React.lazy(() => import('./Home/Home'))

function App() {
  return (
    <div className="App">
      <Suspense fallback={<div>loading...</div>}>
          <Home />
      </Suspense>
    </div>
  );
}
export default App

Home.tsx

import React from 'react';
import {Input, Checkbox} from 'antd';

const Home = () => {
  return <div>
    <Input />
  </div>
}

export default Home

yarn start The first rendering is normal

When I try again home When the < Checkbox / > component is added to the TSX render function, an error is reported as follows:

Ask for help TKS

[jaysuno0]

I was getting the same error while trying to run "npm test" when imported component for testing wasn't imported right.
So in my case it was:

in Header-component I say "export default Header"
and
in my test files I imported it like "{ Header }" instead of just "Header"

[ashwinarumugam]

How did you find which file it was happening at. I'm not able to see any backlogs on which file is affected

[reymondar]

In my case, exporting it as a default was the problem.

[CristianFigueredo]

In my case, I close the app and open it again

[zsh77]

In my case, I was importing from "...../button" instead of "...../Button"

[CristianFigueredo]

Maybe you mean ../../?

[zsh77]

Not exactly. I meant that anything could be before “/button”. But in my case, the problem that led to this error message was that I should have used “/Button” instead of “/button”

[bradherman]

Ran into this today and worked for several hours... Due to some weird merge issue, I was exporting some components more than once in an index file, which caused the issue