import { type DefineTypeFunction } from "https://deno.land/x/deno_slack_sdk@1.4.0/types/types.ts";
definition: { <Def extends CustomTypeDefinition>(definition: Def): CustomType<Def>; }
x/deno_slack_sdk/types/types.ts>DefineTypeFunction
import { type DefineTypeFunction } from "https://deno.land/x/deno_slack_sdk@1.4.0/types/types.ts";