Fix up remaining merge issues from #2426

[cincodenada]

Purpose (TL;DR)

Fix npm releases after a test commit slipped in in #2426

Background (Problem in detail) - optional

This was left in place from the releases switchover, it was intended to
be removed before merging but I failed to communicate that adequately,
so it slipped in.

That commit also removed the post-build script, but that has since been
added back in already.

How to verify - mandatory

The only way to actually verify this, by its nature, is to run a release. It's a pretty simple change though.

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[codecov]

Codecov Report

Merging #2434 (3517fac) into master (4aa9a9e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2434   +/-   ##
=======================================
  Coverage   96.01%   96.01%           
=======================================
  Files          41       41           
  Lines        1906     1906           
=======================================
  Hits         1830     1830           
  Misses         76       76           

Flag	Coverage Δ
unit	96.01% <ø> (ø)

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