The general engine — Elixir's Stream.transform, JS-shaped: hand the raw element flow to your own async generator and yield whatever you want. The one transform where failures do not auto-pass: your generator sees them and owns the ruling. Every missing combinator is three lines away through this.

const pairs = Stream.from([1, 2, 3, 4]).through(async function* (elements) {
  let previous: number | undefined;
  for await (const n of elements) {
    if (previous !== undefined) yield [previous, n] as const;
    previous = n;
  }
});
await pairs.collect(); // [[1, 2], [2, 3], [3, 4]]