import { AsyncStreamBase } from "https://deno.land/x/rimbu@1.2.1/stream/async-custom/index.ts";
Parameters
valueToKey: (value: T, index: number) => MaybePromise<K>
x/rimbu/stream/async-custom/index.ts>AsyncStreamBase#groupBy
import { AsyncStreamBase } from "https://deno.land/x/rimbu@1.2.1/stream/async-custom/index.ts";