1 files changed, 16 insertions, 8 deletions
diff --git a/src/api/MessageEvents.ts b/src/api/MessageEvents.ts
index 90e8c73..8411c9a 100644
--- a/src/api/MessageEvents.ts
+++ b/src/api/MessageEvents.ts
@@ -37,25 +37,33 @@ export interface MessageObject {
     validNonShortcutEmojis: Emoji[];
 }
 
-export type SendListener = (channelId: string, messageObj: MessageObject, extra: any) => void;
+export interface MessageExtra {
+    stickerIds?: string[];
+}
+
+export type SendListener = (channelId: string, messageObj: MessageObject, extra: MessageExtra) => void | { cancel: boolean };
 export type EditListener = (channelId: string, messageId: string, messageObj: MessageObject) => void;
 
 const sendListeners = new Set<SendListener>();
 const editListeners = new Set<EditListener>();
 
-export function _handlePreSend(channelId: string, messageObj: MessageObject, extra: any) {
+export function _handlePreSend(channelId: string, messageObj: MessageObject, extra: MessageExtra) {
     for (const listener of sendListeners) {
         try {
-            listener(channelId, messageObj, extra);
-        } catch (e) { MessageEventsLogger.error(`MessageSendHandler: Listener encoutered an unknown error. (${e})`); }
+            const result = listener(channelId, messageObj, extra);
+            if (result && result.cancel === true) {
+                return true;
+            }
+        } catch (e) { MessageEventsLogger.error("MessageSendHandler: Listener encountered an unknown error\n", e); }
     }
+    return false;
 }
 
-export function _handlePreEdit(channeld: string, messageId: string, messageObj: MessageObject) {
+export function _handlePreEdit(channelId: string, messageId: string, messageObj: MessageObject) {
     for (const listener of editListeners) {
         try {
-            listener(channeld, messageId, messageObj);
-        } catch (e) { MessageEventsLogger.error(`MessageEditHandler: Listener encoutered an unknown error. (${e})`); }
+            listener(channelId, messageId, messageObj);
+        } catch (e) { MessageEventsLogger.error("MessageEditHandler: Listener encountered an unknown error\n", e); }
     }
 }
 
@@ -90,7 +98,7 @@ export function _handleClick(message: Message, channel: Channel, event: MouseEve
     for (const listener of listeners) {
         try {
             listener(message, channel, event);
-        } catch (e) { MessageEventsLogger.error(`MessageClickHandler: Listener encoutered an unknown error. (${e})`); }
+        } catch (e) { MessageEventsLogger.error("MessageClickHandler: Listener encountered an unknown error\n", e); }
     }
 }