Error with generateStaticParams function despite its existence

[k-taro56]

Link to the code that reproduces this issue

https://github.com/k-taro56/next-bug-report

To Reproduce

Set up Next.js.
Add output: 'export' to next.config.js to enable static output.
Create a page that allows dynamic routing.
Create the generateStaticParams function and make it return an empty array.
Run next build.

Error Message:
Error: Page "/[slug]" is missing "generateStaticParams()" so it cannot be used with "output: export" config.

Current vs. Expected behavior

Current behavior:
An error is raised indicating that the generateStaticParams function does not exist.

Expected Behavior:
The generateStaticParams function should return an array with at least one element.

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 11 Home
Binaries:
  Node: 18.18.0
  npm: N/A
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 13.5.6-canary.7
  eslint-config-next: 13.5.5
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2
Next.js Config:
  output: export

Which area(s) are affected? (Select all that apply)

App Router, Static HTML Export (output: "export")

Additional context

No response

_NEXT-1951

[viktorronnback]

The repro code is missing any returned pages in the generateStaticParams function, for example:

export const generateStaticParams = () => [{ slug: "page" }];

However I agree that the error message is misleading, if a maintainer agrees I could add a PR to improve the error message.

[k-taro56]

Thank you for your reply.

I completely agree with your observation regarding the error message.
It would be helpful for others if the error message could be more descriptive or clear about the actual problem.

I would like to submit a PR to improve the error message. Would that be okay?

[airtonix]

@viktorronnback what about when the url looks like:

/keystatic/[...params]

despite my src/app/keystatic/[...params]/page.tsx looking like:

export default function Page() {
    return null;
}

export async function generateStaticParams() {
    return [{ params: [] }]
}

how should I interpret the error:

> Build error occurred
Error: Page "/api/keystatic/[...params]" is missing "generateStaticParams()" so it cannot be used with "output: export" config.

[github-actions]

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