import { type SayArguments } from "https://deno.land/x/slack_bolt@1.0.0/mod.ts";
definition: Pick<ChatPostMessageArguments, Exclude<KnownKeys<ChatPostMessageArguments>, "channel">> & { channel?: string; }
x/slack_bolt/mod.ts>SayArguments
import { type SayArguments } from "https://deno.land/x/slack_bolt@1.0.0/mod.ts";