import { BroadcastChannel } from "https://deno.land/x/deno@v1.28.3/cli/tsc/dts/lib.webworker.d.ts";
type
{ prototype: BroadcastChannel; new (name: string): BroadcastChannel; }
x/deno/cli/tsc/dts/lib.webworker.d.ts>BroadcastChannel
import { BroadcastChannel } from "https://deno.land/x/deno@v1.28.3/cli/tsc/dts/lib.webworker.d.ts";