fix(Gmail Trigger Node): Prevent error for empty emails, improve type safety (#13171)

packages/nodes-base/nodes/Google/Gmail/test/GmailTrigger.test.ts

@@ -212,4 +212,63 @@ describe('GmailTrigger', () => {
 
 		expect(response).toEqual(null);
 	});
+
+	it('should handle duplicates and different date fields', async () => {
+		const messageListResponse: MessageListResponse = {
+			messages: [
+				createListMessage({ id: '1' }),
+				createListMessage({ id: '2' }),
+				createListMessage({ id: '3' }),
+				createListMessage({ id: '4' }),
+				createListMessage({ id: '5' }),
+			],
+			resultSizeEstimate: 123,
+		};
+
+		nock(baseUrl)
+			.get('/gmail/v1/users/me/labels')
+			.reply(200, { labels: [{ id: 'testLabelId', name: 'Test Label Name' }] });
+		nock(baseUrl).get(new RegExp('/gmail/v1/users/me/messages?.*')).reply(200, messageListResponse);
+		nock(baseUrl)
+			.get(new RegExp('/gmail/v1/users/me/messages/1?.*'))
+			.reply(200, createMessage({ id: '1', internalDate: '1727777957863', date: undefined }));
+		nock(baseUrl)
+			.get(new RegExp('/gmail/v1/users/me/messages/2?.*'))
+			.reply(200, createMessage({ id: '2', internalDate: undefined, date: '1727777957863' }));
+		nock(baseUrl)
+			.get(new RegExp('/gmail/v1/users/me/messages/3?.*'))
+			.reply(
+				200,
+				createMessage({
+					id: '3',
+					internalDate: undefined,
+					date: undefined,
+					headers: { date: 'Thu, 5 Dec 2024 08:30:00 -0800' },
+				}),
+			);
+		nock(baseUrl)
+			.get(new RegExp('/gmail/v1/users/me/messages/4?.*'))
+			.reply(
+				200,
+				createMessage({
+					id: '4',
+					internalDate: undefined,
+					date: undefined,
+					headers: undefined,
+				}),
+			);
+		nock(baseUrl).get(new RegExp('/gmail/v1/users/me/messages/5?.*')).reply(200, {});
+
+		const { response } = await testPollingTriggerNode(GmailTrigger, {
+			node: { parameters: { simple: true } },
+			workflowStaticData: {
+				'Gmail Trigger': {
+					lastTimeChecked: new Date('2024-10-31').getTime() / 1000,
+					possibleDuplicates: ['1'],
+				},
+			},
+		});
+
+		expect(response).toMatchSnapshot();
+	});
 });