chore: add type tests

[SimenB]

Purpose (TL;DR) - mandatory

#356 (comment)

I just added a dummy test, no attempt at coverage. But it's a good opportunity for new contributors if they want, and future changes to the types should include tests

[SimenB]

removes the syntax error for import, but still syntax error for type. Might be worth it to add @typescript-eslint/parser or something, but felt very out of scope

[codecov]

Codecov Report

Merging #373 (9e1a23c) into master (c39e970) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #373   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files           1        1           
  Lines         553      553           
=======================================
  Hits          517      517           
  Misses         36       36           

Flag	Coverage Δ
unit	93.49% <ø> (ø)

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[mroderick]

This looks like a good start to me. @SimenB can you think of any reason not to merge this?

[SimenB]

Only reason would be if we wanted more tests before landing, but I think it's valuable as is 👍