Polish types

[eps1lon]

• revert most runtime changes
• test over exec because semantics
• explain eslint-disables
• remove extensions

Targeted at testing-library#848

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (pr/pr_typescript_migration@03f20e1). Click here to learn what that means.
The diff coverage is n/a.

@@                      Coverage Diff                       @@
##             pr/pr_typescript_migration        #2   +/-   ##
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  Coverage                              ?   100.00%           
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  Files                                 ?        26           
  Lines                                 ?       938           
  Branches                              ?       287           
==============================================================
  Hits                                  ?       938           
  Misses                                ?         0           
  Partials                              ?         0           

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[marcosvega91]

thanks :). Is it ready ? looks good

[eps1lon]

Leaving this for visibility. Cherry-picking them directly into the PR. But for a release I want to make sure we're not changing runtime behavior needlessly.