feat(Gmail Node): Add thread option for draft emails (#8729)

Co-authored-by: Jonathan Bennetts <[email protected]>

Author: Nicolas-nwb

packages/nodes-base/nodes/Google/Gmail/v2/DraftDescription.ts

@@ -151,6 +151,14 @@ export const draftFields: INodeProperties[] = [
 				default: '',
 				description: 'The email address that the reply message is sent to',
 			},
+			{
+				displayName: 'Thread ID',
+				name: 'threadId',
+				type: 'string',
+				placeholder: '18cc573e2431878f',
+				default: '',
+				description: 'The identifier of the thread to attach the draft',
+			},
 			{
 				displayName: 'Attachments',
 				name: 'attachmentsUi',

packages/nodes-base/nodes/Google/Gmail/v2/GmailV2.node.ts

@@ -528,6 +528,7 @@ export class GmailV2 implements INodeType {
 						let cc = '';
 						let bcc = '';
 						let replyTo = '';
+						let threadId = null;
 
 						if (options.sendTo) {
 							to += prepareEmailsInput.call(this, options.sendTo as string, 'To', i);
@@ -545,6 +546,10 @@ export class GmailV2 implements INodeType {
 							replyTo = prepareEmailsInput.call(this, options.replyTo as string, 'ReplyTo', i);
 						}
 
+						if (options.threadId && typeof options.threadId === 'string') {
+							threadId = options.threadId;
+						}
+
 						let attachments: IDataObject[] = [];
 						if (options.attachmentsUi) {
 							attachments = await prepareEmailAttachments.call(
@@ -574,6 +579,7 @@ export class GmailV2 implements INodeType {
 						const body = {
 							message: {
 								raw: await encodeEmail(email),
+								threadId: threadId || undefined,
 							},
 						};