I also hadn't written Javascript in, 10 years maybe, and had never touched Typescript, so I spent some time collecting resources on what's happened in the ecmascript world over the past decade. Humorously, a lot, and not that much. Turns out that by skipping a decade you get to largely ignore a lot of the churn as people tried to sort the spec design by (corporate) committee out. :) Happy to send those over if helpful, also.