pageExtensions

You can extend the default Page extensions (.tsx, .ts, .jsx, .js) used by Next.js. Inside next.config.js, add the pageExtensions config:

module.exports= { pageExtensions: ['mdx','md','jsx','js','tsx','ts'],}

Changing these values affects all Next.js pages, including the following:

• middleware.js
• instrumentation.js
• pages/_document.js
• pages/_app.js
• pages/api/

For example, if you reconfigure .ts page extensions to .page.ts, you would need to rename pages like middleware.page.ts, instrumentation.page.ts, _app.page.ts.

Including non-page files in the pages directory

You can colocate test files or other files used by components in the pages directory. Inside next.config.js, add the pageExtensions config:

module.exports= { pageExtensions: ['page.tsx','page.ts','page.jsx','page.js'],}

Then, rename your pages to have a file extension that includes .page (e.g. rename MyPage.tsx to MyPage.page.tsx). Ensure you rename all Next.js pages, including the files mentioned above.