fix(Message): Optional parameter for setting allowed mentions (#11338)

feat: allow empty allowed mentions

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/builders/__tests__/messages/message.test.ts

@@ -24,6 +24,19 @@ describe('Message', () => {
 		expect(() => message.toJSON()).toThrow();
 	});
 
+	test('GIVEN empty allowed mentions THEN return valid toJSON data', () => {
+		const allowedMentions = new AllowedMentionsBuilder();
+		expect(allowedMentions.toJSON()).toStrictEqual({});
+
+		const message = new MessageBuilder().setContent('test').setAllowedMentions();
+
+		expect(message.toJSON()).toStrictEqual({
+			...base,
+			allowed_mentions: {},
+			content: 'test',
+		});
+	});
+
 	test('GIVEN parse: [users] and empty users THEN return valid toJSON data', () => {
 		const allowedMentions = new AllowedMentionsBuilder();
 		allowedMentions.setUsers();

packages/builders/src/messages/Message.ts

@@ -239,7 +239,7 @@ export class MessageBuilder
 		allowedMentions:
 			| AllowedMentionsBuilder
 			| APIAllowedMentions
-			| ((builder: AllowedMentionsBuilder) => AllowedMentionsBuilder),
+			| ((builder: AllowedMentionsBuilder) => AllowedMentionsBuilder) = new AllowedMentionsBuilder(),
 	): this {
 		this.data.allowed_mentions = resolveBuilder(allowedMentions, AllowedMentionsBuilder);
 		return this;