CODEWITHSUNDEEP
javascriptreactjsnext.jsserver-side-rendering
Roman
Roman

Reputation: 639

Unsupported Server Component type: undefined / next js 13

I ran into some weird behavior in Next js 13 while trying to do a simple action. I have prepared the most simple example showing the problem. I hope you can help me figure out why this is happening.

There are 3 components.

page:

import {Container} from '../components/Container'
export default function index() {
  return (
    <Container>
        <Container.Window>
            <h1>12345</h1>
        </Container.Window>
    </Container>
  )
}

Container:

'use client';
import { Window } from './Window';

export const Container = ({ children }) => {
  return children;
};

Container.Window = Window;

Window:

"use client";
export const Window = ({children})=>{
  return children
}

Page server component. The Container and Window components are client-side. Container imports and exports Window.

I am getting this error:

"Unsupported Server Component type: undefined"

But I think the first option is the most convenient. Would love to make it work

https://stackblitz.com/edit/nextjs-fwuztm?file=app%2Fpage.js,components%2FContainer.js,components%2FWindow.js - example

Upvotes: 48

Views: 75866

Answers (12)

anand mohan
anand mohan

Reputation: 9

I think whenever you change a component from server to client or vice versa , you have to rerun pnpm run dev . May be it is related to build of the app.

Upvotes: 0

Clem-lemon
Clem-lemon

Reputation: 1

My problem was resolved by adding 'use client' to the parent component tsx file.

Upvotes: 0

Faheem
Faheem

Reputation: 1

I was also stucked with this thing. After hours of work i just stopped my server and started it again and all worked good. The error was not there by doing so

Upvotes: 0

Amarnath Ayyanan Chakkaravarth
Amarnath Ayyanan Chakkaravarth

Reputation: 81

Had the same problem while going through NextJS Dashboard tutorial(adding Active Links using usepathname hook and 'use client' section).

Restarting the npm or pnpm server resolved the issue!

Upvotes: 6

Khaireddine Arbouch
Khaireddine Arbouch

Reputation: 131

After stopping the server and running pmpm run dev, the issue was resolved successfully.

Upvotes: 13

Daniel Tonon
Daniel Tonon

Reputation: 10472

I did the default export thing and it still wasn't working for me.

I gave up and turned off my computer, when I returned, it was working.

So based on that, here are things to try doing in order:

  1. If you are using named exports, convert them to default exports
  2. Stop Node and re-run the npm run dev command
  3. Close and re-open VS Code (or whatever code editor you're using)
  4. Restart your computer

Upvotes: 18

Ben Gubler
Ben Gubler

Reputation: 1441

My problem was resolved by changing import { SomeType } to import type { SomeType }.

Upvotes: -1

Abhishek
Abhishek

Reputation: 1120

If you are exporting your component as default export and are importing your component as a named export or vice versa, this could also be the scenario where the problem occurs

Importing and Exporting error like this:

exported component:

export default function ExportedComp() {
//logic
}

Page where you import:

import {ExportedComp} from 'pathname'

Or vice versa!

Upvotes: 3

clxrity
clxrity

Reputation: 336

This issue portrayed with external/component library

I ran into this issue as well, my problem was the way I was exporting / importing.

for reference...

This is for a react component library. I was receiving your same error when importing my component from the package in my next.js application.

Structure of the library

├── src
│   ├── components
│   │   ├── MyComponentName
│   │   │   ├── MyComponentName.tsx
│   │   │   ├── ...
│   │   │   ├── index.ts
│   │   ├── index.ts
│   ├── ...
│   ├── index.ts
├── ...

MyComponentName.tsx

const MyComponentName () => {

    return <>
    /* stuff */
    </>
};

export default MyComponentName; /* make sure to default export initially */

MyComponentName/index.ts

import MyComponentName from "./MyComponentName"; // import the component from the component file

export default MyComponentName; // export default

components/index.ts

export { default as MyComponentName } from "./MyComponentName";

Lastly...

src/index.ts

export { MyComponentName } from "./components";

Then, to import from the package:

import { MyComponentName } from "@clxrityy/my-component-library";

I know this particular example seems like an overly complex structure of imports/exports, but it's necessary for my purposes. I hope this can help anyone who is running into a similar issue with these circumstances.

Upvotes: 1

Yilmaz
Yilmaz

Reputation: 49561

I had this return jsx:

return <>{product && <ProductView product={product} />}</>;

it turns out that importing one component inside ProductView was from the wrong path.

Upvotes: 0

lu_ke____
lu_ke____

Reputation: 262

Update (for named imports)

As per Jason Frank's comments, you can keep the 'use client' at the component level without the need to mark all components as client side in the index.ts. This allows you to keep using named imports whilst keeping a folder of mixed server/client components.

// Client Side Component
'use client'

export default function ClientCard() {
  return <p>client side card here</p>
}

// Server Side Component
export default function ServerCard() {
  return <p>server side card here</p>
}

// index.ts
export { default as ClientCard } from './client-card';
export { default as ServerCard } from './server-card';

Not too sure if this is related but ran into a similar issue.

'use client'

export function Card() {
  return <p>card here</p>
}

// index.ts
export * from './card'

The above threw errors when attempting to import via import { Card } from './card.

Adding 'use client' to the index.ts seemed to fix the issue.

// index.ts - FIXED
'use client'

export * from './card'

Upvotes: 7

Awyssa
Awyssa

Reputation: 336

I had the same issue. I was able to fix by changing the named export to a default export, and importing without the braces.

Try changing:

export const Window = ({children})=>{

to

const Window = ({children})=>{
...
}
export default Window;

Hopin that helps!

Upvotes: 30

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