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I omit them where possible as I feel they add visual noise. Typescript is usually pretty good at warning me if I need to add them for disambiguation!

I never omit them (unless I'm in an existing codebase that does it) because it's a nice indication that the statement is over, but also I hate relying on whitespace for anything, although admittedly newlines are fairly safe. I have stronger feelings about "off-side rule" languages like Python