• It's not common, but JavaScript's semi-colon insertion rules can be painful sometimes
• The ecosystem has largely grown to favor semicolons in recent years
• ...which can largely be attributed to Prettier, which formats code using semicolons by default
• Sticking closer to the defaults of Prettier makes us a good citizen of the JavaScript-kingdom

Instead of reviewing this by reading through the diff, I might suggest reviewing by reproducing.

• Make sure your local refs are up-to-date

  git fetch origin
  

• Checkout the latest commit from the main branch

  git checkout b15bfa4
  

• Manually set your HEAD to this branch

  git reset origin/semicolons
  

You should now have a huge git diff of 664 files. Your HEAD includes these changes, but your local files will still be the same as on the main branch.

• Edit .prettierrc.yaml

  - semi: false

• Regenerate site/.prettierrc.yaml

  make site/.prettierrc.yaml
  

• Format all of the code!

  make fmt
  

If you check git diff now, you should see that only one other small difference remains (I added a space to a comment)