import { MultiMapEmpty } from "https://deno.land/x/rimbu@1.2.0/multimap/custom/implementation/base.ts";
Parameters
options: { ifNew?: OptLazy<StreamSource<V>>; }
Returns
WithKeyValue<Tp, K, V>["normal"]
x/rimbu/multimap/custom/implementation/base.ts>MultiMapEmpty#modifyAt
import { MultiMapEmpty } from "https://deno.land/x/rimbu@1.2.0/multimap/custom/implementation/base.ts";