[fix] parent_component is undefined

[zhmushan]

This bug was introduced in #5870
When a svelte file is imported into another svelte file that has been compiled into js, the parent_component will be undefined

[bluwy]

Duplicate of #6646. Related issue #6584. I don't think the issue is fully justified yet for a fix to be made.

When a svelte file is imported into another svelte file that has been compiled into js, the parent_component will be undefined

If a svelte component is compiled to JS, it needs to me mounted with a target since both uncompiled and compiled Svelte components don't share the same scheduling loop. If I'm missing something, it would be great to explain your use case in the linked issue as well. Closing for now.