Next.js 12 doesn't run ` _app/index.page.tsx`

[denkigai]

What version of Next.js are you using?

12.0.4

What version of Node.js are you using?

16.7.0

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

local

Describe the Bug

When I set index.page.tsx under _app directory, Next.js 12 doesn't run it.
Previous version of Next.js works with this properly. Is this directory structure not recommended?

Expected Behavior

_app/index.page.tsx

To Reproduce

Move _app.tsx into _app directory and rename it as index.page.tsx with custom page extension setting.

[denkigai]

I found that _document/index.page.tsx also doesn't work.

[hellolovebuxiu]

I had same issue

[thibautsabot]

Hey!

I tried to bisect to see when the issue started occurring and it seems that it was introduced by v11.1.1-canary.12.

By looking at the release notes, the most logical candidate would be this PR: #28279.

[balazsorban44]

I am just curious, what's gain here over simply having a _app.tsx and/or _document.tsx file?

If it's this: https://nextjs.org/docs/api-reference/next.config.js/custom-page-extensions

I would also try _app.page.tsx and _document.page.tsx also.

I don't see having these as folders are documented.

[balazsorban44]

The documentation actually does not mention using those files in that format (It does mention _app.page.tsx and _document.page.tsx, so these are fine), so it was never actually intended to define these files in folders.

[balazsorban44]

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