import { BiMultiMapEmpty } from "https://deno.land/x/rimbu@1.0.0/bimultimap/custom/implementation/immutable.ts";
Returns
WithKeyValue<Tp, K, V>["nonEmpty"]
x/rimbu/bimultimap/custom/implementation/immutable.ts>BiMultiMapEmpty#add
import { BiMultiMapEmpty } from "https://deno.land/x/rimbu@1.0.0/bimultimap/custom/implementation/immutable.ts";