fix(types): missing response type on OnHandlerInterface

[sor4chi]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (ecf5a0b) to head (f15e391).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3852   +/-   ##
=======================================
  Coverage   91.32%   91.32%           
=======================================
  Files         161      161           
  Lines       10242    10242           
  Branches     2891     2863   -28     
=======================================
  Hits         9353     9353           
  Misses        888      888           
  Partials        1        1           

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[yusukebe]

LGTM!

[yusukebe]

@sor4chi

Thanks! This should be fixed. I'll merge this.