chore: simplify code

[Rich-Harris]

this is faster and less code

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[Conduitry]

There's been a push I've noticed elsewhere in the browser runtime to use vars for performance reasons. Is that something we want to still keep doing?

[Rich-Harris]

Yeah, I think we should. Though I went to edit this PR just now and it would have meant either a) leaving a bunch of var declarations right next to const and let declarations or b) making this PR much larger. I reckon we should change them en masse in a separate PR. would be nice if there was a lint rule or something that helped us enforce it in non-loop cases