feat(CommandInteraction): ephemeral followup messages

src/structures/CommandInteraction.js

@@ -187,6 +187,24 @@ class CommandInteraction extends Interaction {
    * @property {Role|Object} [role] The resolved role
    */
 
+  /**
+   * Send a follow-up message to this interaction.
+   * @param {string|APIMessage|MessageAdditions} content The content for the reply
+   * @param {InteractionReplyOptions} [options] Additional options for the reply
+   * @returns {Promise<Message|Object>}
+   */
+  async followUp(content, options) {
+    const apiMessage = content instanceof APIMessage ? content : APIMessage.create(this, content, options);
+    const { data, files } = await apiMessage.resolveData().resolveFiles();
+
+    const raw = await this.client.api.webhooks(this.applicationID, this.token).post({
+      data,
+      files,
+    });
+
+    return this.channel?.messages.add(raw) ?? raw;
+  }
+
   /**
    * Transforms an option received from the API.
    * @param {Object} option The received option

typings/index.d.ts

@@ -425,6 +425,10 @@ declare module 'discord.js' {
     ): Promise<Message | RawMessage>;
     public editReply(content: string, options?: WebhookEditMessageOptions): Promise<Message | RawMessage>;
     public fetchReply(): Promise<Message | RawMessage>;
+    public followUp(
+      content: string | APIMessage | InteractionReplyOptions | MessageAdditions,
+    ): Promise<Message | RawMessage>;
+    public followUp(content: string, options?: InteractionReplyOptions): Promise<Message | RawMessage>;
     public reply(content: string | APIMessage | InteractionReplyOptions | MessageAdditions): Promise<void>;
     public reply(content: string, options?: InteractionReplyOptions): Promise<void>;
     private transformOption(option: object, resolved: object): CommandInteractionOption;