import { type DefineEventSignature } from "https://deno.land/x/deno_slack_sdk@2.1.3/events/types.ts";
definition: { <Def extends CustomEventDefinition>(definition: Def): CustomEvent<Def>; }
x/deno_slack_sdk/events/types.ts>DefineEventSignature
import { type DefineEventSignature } from "https://deno.land/x/deno_slack_sdk@2.1.3/events/types.ts";