exports method argument types

[aoberoi]

Summary

fixes #483

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #502 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #502   +/-   ##
=======================================
  Coverage   81.32%   81.32%           
=======================================
  Files           6        6           
  Lines         241      241           
  Branches       37       37           
=======================================
  Hits          196      196           
  Misses         29       29           
  Partials       16       16

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