Add missing export type notation for unsupported types

[cmaster11]

Previously, a definition like

export const TestSchema = Joi.function().meta({ className: 'Test' });

was exporting broken TS code:

(...args: any[]) => any;

It now exports:

export type Test = (...args: any[]) => any;

Note: this will conflict on merge with #400. I'll take care of it if merged. Probably one test will fail.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4366519) 98.69% compared to head (5bedda5) 98.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #401   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files           9        9           
  Lines         535      537    +2     
  Branches      206      207    +1     
=======================================
+ Hits          528      530    +2     
  Misses          7        7           

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[cmaster11]

@mrjono1 test fixed now :)