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

4.43.1

Current Behavior

When a component extends a mixin that has a private or protected member it does not get its type definitions added to ./dist/types/components/*. Mixins with public members only get added correctly.

Expected Behavior

All components, regardless of the composition of their mixins, get their types added to the types output

System Info

System: node 22.14.0
    Platform: darwin (25.3.0)
   CPU Model: Apple M4 Pro (12 cpus)
    Compiler: /Users/XXX/Sanity/stencil-issue/node_modules/@stencil/core/compiler/stencil.js
       Build: 1771605342
     Stencil: 4.43.1 🏹
  TypeScript: 5.8.3
      Rollup: 4.44.0
      Parse5: 7.2.1
      jQuery: 4.0.0-pre
      Terser: 5.37.0

Steps to Reproduce

npm install
npm run build
observe dist/types/components only ComponentA and ComponentB get added. ComponentC and ComponentD are missing.

Code Reproduction URL

https://github.com/kyleMessnerLillyContractor/stencil-issue/tree/issue-4

Additional Information

No response