bug: TypeError: elm.dispatchEvent is not a function

[Cliffback]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Stencil Version

=4.36.1

Current Behavior

Upgrading from 4.36.0 to 4.36.1 we get TypeError: elm.dispatchEvent is not a function when running tests with vitest.

Same issue occurs with newer versions.

emitEvent node_modules/@stencil/core/internal/client/index.js?app-data=conditional:2701:5

Expected Behavior

Worked fine until upgrading

System Info

System: node 22.19.0
    Platform: linux (6.6.87.2-microsoft-standard-WSL2)
   CPU Model: 12th Gen Intel(R) Core(TM) i7-12800HX (24 cpus)
    Compiler: /home/username/dev/tmp/my-project/node_modules/@stencil/core/compiler/stencil.js
       Build: 1757722623
     Stencil: 4.37.0
  TypeScript: 5.5.4
      Rollup: 4.34.9
      Parse5: 7.2.1
      jQuery: 4.0.0-pre
      Terser: 5.37.0

Steps to Reproduce

To set up a reproducable case public would take some time.

Code Reproduction URL

N/A

Additional Information

No response

[johnjenkins]

Hi @Cliffback -

Appreciate it takes time to make a reproduction but it really helps fix / diagnose / write regression tests.

Do you have any insight into what changed in stencil between those versions that might cause this at least?

[Cliffback]

Hi @Cliffback -

Appreciate it takes time to make a reproduction but it really helps fix / diagnose / write regression tests.

Do you have any insight into what changed in stencil between those versions that might cause this at least?

Absolutely get that. I'll see if I can set aside time to spin up a project. It is really not our own project this happens in, but a consuming project of our stencil project.

Had a look at the diff between the two versions. Not really sure, but I'll keep looking
v4.36.0...v4.36.1