import { type OnBeforeUnloadEventHandlerNonNull } from "https://deno.land/x/evt@v2.5.2/lib/types/lib.dom.ts";
Call Signatures
(event: Event): string | null
x/evt/lib/types/lib.dom.ts>OnBeforeUnloadEventHandlerNonNull
import { type OnBeforeUnloadEventHandlerNonNull } from "https://deno.land/x/evt@v2.5.2/lib/types/lib.dom.ts";