TL;DR

Update the type definition for the id in the sitemap function to reflect it as a string instead of a number.

Guidance

• Verify the type of the id received in the sitemap function using console.log(typeof id) to confirm it's a string.
• Update any switch case statements or other code that relies on the id being a number to handle it as a string instead.
• Check the Next.js documentation for any updates or guidance on the expected type of the id in the sitemap function.
• Consider opening an issue with Next.js to report the type discrepancy and suggest an update to their documentation or type definitions.

Example

// Before
switch (id) {
  case 1:
    // code
    break;
}

// After
switch (id) {
  case '1':
    // code
    break;
}

Notes

The fix assumes that the id will always be a string representation of a number. If the id can be a non-numeric string, additional error handling may be necessary.

Recommendation

Apply workaround: update the code to handle the id as a string, as the current type definition appears to be incorrect. This will allow the code to function as expected until the type definition can be updated.