#933 Discriminated union for frame alignment

[dolanmiu]

@anti-the-social I believe I have found a fix for this

Essentially, you can only have either position or alignment, but not both.

I have updated TypeScript definitions to prevent people from doing that, but it would be a breaking change

Need to add a new type attribute to the frame properties.

Let me know what you think?

Fixes #933

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (86bdf3e) 99.96% compared to head (e358216) 99.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2477   +/-   ##
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  Coverage   99.96%   99.96%           
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  Files         270      270           
  Lines       13132    13175   +43     
  Branches     1312     1311    -1     
=======================================
+ Hits        13128    13171   +43     
  Misses          4        4           

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