Bug: adding/removing JSX between HMR

[lxsmnsyc]

Repro is a component that returns an element with two or more children. In between saves, comment out one of the children, which may lead to the following behavior:

• It throws an error
• component mounts twice

This issue only exists in 0.7.0

Parcel:

• Cannot reproduce when component returns a fragment.
• Can reproduce when component returns an element:
  • When removing an element, the component remounts. Not a big issue.
  • When adding an element, the component behaves correctly.

Note

This works correctly

Vite:

• Can reproduce when component returns an element or a fragment:
  • When removing an element, the component mounts twice bottom-to-top.
  • Re-adding the removed element between HMR works fine.
  • Re-adding the removed element on fresh load works fine.