needs testing

src/handlers/channel.ts

@@ -182,6 +182,17 @@ export async function sendMessage(
         content.mentions.roles = content.mentions.roles.slice(0, 100);
       }
     }
+
+    if (content.mentions.repliedUser) {
+      if (
+        !(await botHasChannelPermissions(
+          channelID,
+          [Permissions.READ_MESSAGE_HISTORY],
+        ))
+      ) {
+        throw new Error(Errors.MISSING_SEND_MESSAGES);
+      }
+    }
   }
 
   const channel = await cacheHandlers.get("channels", channelID);
@@ -197,7 +208,13 @@ export async function sendMessage(
     endpoints.CHANNEL_MESSAGES(channelID),
     {
       ...content,
-      allowed_mentions: content.mentions,
+      allowed_mentions: content.mentions
+        ? {
+          ...content.mentions,
+          replied_user: content.mentions.repliedUser === true,
+        }
+        : undefined,
+      message_reference: content.replyMessageID,
     },
   );
 

src/structures/message.ts

@@ -11,11 +11,14 @@ export async function createMessage(data: MessageCreateOptions) {
     webhook_id: webhookID,
     message_reference: messageReference,
     edited_timestamp: editedTimestamp,
+    referenced_message: referencedMessageID,
     ...rest
   } = data;
 
   const message = {
     ...rest,
+    /** The message id of the original message if this message was sent as a reply. If null, the original message was deleted. */
+    referencedMessageID,
     channelID,
     guildID: guildID || "",
     mentions: data.mentions.map((m) => m.id),

src/types/channel.ts

@@ -101,6 +101,8 @@ export interface MessageContent {
     roles?: string[];
     /** Array of user_ids to mention (Max size of 100) */
     users?: string[];
+    /** Should the message author from the original message be mention. By default this is false.  */
+    repliedUser?: boolean;
   };
   /** The message contents, up to 2000 characters */
   content?: string;
@@ -114,6 +116,8 @@ export interface MessageContent {
   embed?: Embed;
   /** JSON encoded body of any additional request fields. */
   payload_json?: string;
+  /** If you want to send a reply message, provide the original message id here */
+  replyMessageID?: string;
 }
 
 export interface GetMessages {

src/types/message.ts

@@ -154,6 +154,11 @@ export enum MessageTypes {
   USER_PREMIUM_GUILD_SUBSCRIPTION_TIER_2,
   USER_PREMIUM_GUILD_SUBSCRIPTION_TIER_3,
   CHANNEL_FOLLOW_ADD,
+  GUILD_DISCOVERY_DISQUALIFIED = 14,
+  GUILD_DISCOVERY_REQUALIFIED,
+  GUILD_DISCOVERY_GRACE_PERIOD_INITIAL_WARNING,
+  GUILD_DISCOVERY_GRACE_PERIOD_FINAL_WARNING,
+  REPLY = 19,
 }
 
 export enum ActivityTypes {
@@ -275,6 +280,8 @@ export interface MessageCreateOptions {
   message_reference?: Reference;
   /** The message flags combined like permission bits describe extra features of the message */
   flags?: 1 | 2 | 4 | 8 | 16;
+  /** The message id of the original message if this message was sent as a reply. If null, the original message was deleted. */
+  referenced_message?: MessageCreateOptions | null;
 }
 
 export interface BaseMessageDeletePayload {