Next.js slug conflict: getStaticPaths returning duplicate paths with static page

The issue you're encountering is a common Next.js routing conflict. When you have both [slug].js (a dynamic catch-all route) and people.js (a static route) in the same pages folder, Next.js is complaining because your getStaticPaths in [slug].js is likely returning a path that includes "people" as one of the slugs.

Here's what's happening: if your Sanity query in [slug].js returns documents that include one with a slug of "people", Next.js sees two routes trying to handle /people - both the dynamic [slug].js route and the static people.js file. This creates the "paths must unique per page" error.

Solutions:

1. Filter out conflicting slugs in getStaticPaths (recommended):

// [slug].js
export const getStaticPaths = async () => {
   const paths = await sanityClient.fetch(currentPage);
   
   // Filter out any paths that conflict with static pages
   const filteredPaths = paths.filter(path => {
      const slug = path.params?.slug || path.slug;
      return slug !== 'people'; // Add other static page slugs here
   });

   return {
      paths: filteredPaths,
      fallback: false
   };
};

2. Restructure your routes: Move people.js into a subfolder or rename it to avoid conflicts. For example, create a /team/people.js route instead.

3. Consolidate into the dynamic route: Remove people.js entirely and handle it through your [slug].js by creating a "people" document in Sanity with the appropriate content type.

Additional note about your path format: Make sure your currentPage query returns paths in the correct format. The paths array should look like:

paths: [
  { params: { slug: 'about' } },
  { params: { slug: 'contact' } },
  // etc.
]

If your query is returning slugs directly as strings, you'll need to map them:

const slugs = await sanityClient.fetch(currentPage);
const paths = slugs.map(slug => ({ params: { slug } }));

The first solution (filtering) is typically the cleanest approach when you have a mix of static and dynamic pages. Just make sure to exclude any slug values that match your static page filenames.