Space before @html breaks the build

[mulder999]

Describe the bug

Rune components do not support space between { and @html, whereas legacy do.

Reproduction

1. Create a rune component that has { @html "ABCD"}
2. Run npm run build

Build fails with:

error during build:
undefined

Logs

No response

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (32) x64 13th Gen Intel(R) Core(TM) i9-13900K
    Memory: 36.41 GB / 63.76 GB
  Binaries:
    Node: 22.10.0 - ~\AppData\Local\Volta\tools\image\node\22.10.0\node.EXE
    Yarn: 4.4.1-git.20240825.hash-b2f315f6 - ~\AppData\Local\Volta\tools\image\yarn\4.4.1-git.20240825.hash-b2f315f6\bin\yarn.CMD
    npm: 10.9.0 - M:\Git\yoursky.blue\ys-www\node_modules\.bin\npm.CMD
  Browsers:
    Chrome: 130.0.6723.70
    Edge: Chromium (127.0.2651.74)
    Internet Explorer: 11.0.22621.3527
  npmPackages:
    svelte: ^5 => 5.1.2

Severity

annoyance

[brunnerh]

Apparently this is intentional, but the enforcement is inconsistent.

And as noted in the discussion, it probably should be migrated if it errors otherwise.
(Though I am not a fan of the enforcement in general, to me it's a matter of code style.)

[mulder999]

Thanks for pointers.

Breaking the build without providing a clear error message is a bug, regardless of the intended behavior. Users need meaningful feedback to diagnose issues effectively.