Fix types not applying to sub handlers

[ryardley]

This closes https://github.com/ryardley/ts-bus/issues/42

Not sure how to setup a regression test to avoid this happening again in the future? @dmicic any ideas?

[codecov[bot]]

Codecov Report

Merging #45 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #45   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          87     89    +2     
  Branches       11     11           
=====================================
+ Hits           87     89    +2

Impacted Files	Coverage Δ
src/useBusReducer.ts	100% <100%> (ø)	:arrow_up:
src/EventBus.ts	100% <100%> (ø)	:arrow_up:
src/useBusState.ts	100% <100%> (ø)	:arrow_up:

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[dmicic]

This closes #42

Not sure how to setup a regression test to avoid this happening again in the future? @dmicic any ideas?

@ryardley In languages that I am more familiar with (e.g. C#), I would write in such cases code quality tests that analyse the structure of the object under test (e.g. function, class etc.) with the help of reflection. Now in the TS/JS world I am not sure whether this is achievable, resp. whether the reflection-like functions as for example "getOwnPropertyDescriptor' are sufficient to extract the function signature of all overloads.