Bump to node16 and small fixes

[thomasrockhu-codecov]

Incorporates @chenrui333's changes here

[codecov]

Codecov Report

Merging #689 (174efc5) into master (d8cf680) will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #689      +/-   ##
==========================================
+ Coverage   95.12%   95.73%   +0.60%     
==========================================
  Files           4        4              
  Lines         164      164              
  Branches       47       47              
==========================================
+ Hits          156      157       +1     
+ Misses          8        7       -1     

Flag	Coverage Δ
demo	80.00% <ø> (ø)
macos-latest	95.73% <100.00%> (+0.60%)	⬆️
script	97.31% <100.00%> (+0.67%)	⬆️
ubuntu-latest	95.73% <100.00%> (+0.60%)	⬆️
version	80.00% <ø> (ø)
windows-latest	95.73% <100.00%> (+0.60%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/buildExec.ts	99.13% <100.00%> (+0.86%)	⬆️

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