import { type StatefulReadonlyObservable } from "https://deno.land/x/denoify@v1.6.16/scripts/tools/StatefulObservable.ts";
definition: { readonly current: T; subscribe: (next: (data: T) => void) => Subscription; }
x/denoify/scripts/tools/StatefulObservable.ts>StatefulReadonlyObservable
import { type StatefulReadonlyObservable } from "https://deno.land/x/denoify@v1.6.16/scripts/tools/StatefulObservable.ts";