RUrunarberg·Apr 7, 2026
many things !== all the things
More good works from the last 10 years includes .at(), nullish chaining, BigInt etc.
But most of what you mentioned is closing in on 10 years in the standard (Async/Await is from 2017) meaning the bulk of the work done is from over 10 years ago.
The failure of AbortSignal is exactly the kind of failure TC39 has been doing in bulk lately. I have been following the proposal to add Observables to the language, which is a stage 1 proposal (and has been for over 10 years!!!). There were talks 5 years ago (!) to align the API with AbortSignal[1] which I think really exemplifies the inability for TC39 to reach a workable decision (at least as it operates now).
Another example I like to bring up are the failure of the pipeline operator[2], which was advanced to stage-2 four years ago and has been in hiatus ever sinc
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e with very little work to show for it. After years of deliberation very controversal version of the operator with a massive community backlash. Before they advanced it it was one of the more popular proposals, now, not so much, and personally I sense any enthusiasm for this feature has pretty much vanished. In other words I think they took half a decade to make the obviously wrong decision, and have since given up.
From the failure of the pipeline operator followed a bunch of half-measures such as array grouping, and iterator helpers etc. which could have easily been implemented in userland libraries if the more functional version of the pipeline operator would have advanced.
1: https://github.com/tc39/proposal-observable/issues/209
2: https://github.com/tc39/proposal-pipeline-operator