[Bug]: Front-end build touches *all* apps scss/css

[ChristophWurst]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Nextcloud Server is running on 64bit capable CPU, PHP and OS.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Running npm run build touches app scss and creates unexpected css files

I raised this earlier in #35622 (comment) already and a discussion spawned at nextcloud/standards#9 but until a decision has been made and docs still recommend people to clone into apps I think it's fair to say the server front-end should leave unrelated apps untouched.

Steps to reproduce

1. Clone server
2. Clone calendar into apps
3. Compile the server front-end

Expected behavior

No changes in the calendar repo

Installation method

None

Nextcloud Server version

master

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

N/a

List of activated Apps

N/a

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

cc @skjnldsv @AndyScherzinger

[ChristophWurst]

Idea: read https://github.com/nextcloud/server/blob/master/core/shipped.json and only run the sass compiler for apps in there.

Added benefit: the local build with additional apps becomes faster.

[AndyScherzinger]

Suggestion of @ChristophWurst would be fine with me, so looking for the feedback of @skjnldsv and depending on the efforts and availability I'd be okay with adding this for 27 during the stabilization phase. Not sure what you think @skjnldsv

[skjnldsv]

Sure :)
This is really a dev corner case.
It's the same for composer jobs like lint or php-cs

[ChristophWurst]

The cs fixer is able to ignore anything ignored by git:

server/.php-cs-fixer.dist.php

Line 12 in 263a691

->ignoreVCSIgnored(true)

But yes, lint probably has the same issue. Albeit it doesn't modify additional apps.

[AndyScherzinger]

So how much work do we expect this to be and who could take care of it?

[ChristophWurst]

2h for an experienced frontender