add message util class

src/util/MessageUtil.ts

@@ -0,0 +1,10 @@
+import type { MessageContent } from 'eris';
+import type { Client } from '../class';
+
+export default class MessageUtil {
+  static async sendDirectMessage(content: MessageContent, userID: string, client: Client) {
+    const dmChannel = await client.getDMChannel(userID);
+    if (!dmChannel) throw new Error(`DM Channel for user ${userID} doesn't exist.`);
+    return dmChannel.createMessage(content);
+  }
+}