Add simple field definition to ts

[shellka]

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[codecov]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #265   +/-   ##
=======================================
  Coverage   90.70%   90.70%           
=======================================
  Files           3        3           
  Lines         312      312           
  Branches      108      108           
=======================================
  Hits          283      283           
  Misses         29       29           

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