fix(EmailReadImap Node): Fix issue that crashed process if node was configured wrong (#3079)

* 🐛 Fix issue that IMAP node can crash n8n

* 👕 Fix lint issue

packages/nodes-base/nodes/EmailReadImap/EmailReadImap.node.ts

@@ -1,13 +1,15 @@
 import { ITriggerFunctions } from 'n8n-core';
 import {
+	createDeferredPromise,
 	IBinaryData,
 	IBinaryKeyData,
 	IDataObject,
+	IDeferredPromise,
 	INodeExecutionData,
 	INodeType,
 	INodeTypeDescription,
 	ITriggerResponse,
-	LoggerProxy,
+	LoggerProxy as Logger,
 	NodeOperationError,
 } from 'n8n-workflow';
 
@@ -25,10 +27,6 @@ import {
 
 import * as lodash from 'lodash';
 
-import {
-	LoggerProxy as Logger
-} from 'n8n-workflow';
-
 export class EmailReadImap implements INodeType {
 	description: INodeTypeDescription = {
 		displayName: 'EmailReadImap',
@@ -377,6 +375,8 @@ export class EmailReadImap implements INodeType {
 			return newEmails;
 		};
 
+		const returnedPromise: IDeferredPromise<void> | undefined = await createDeferredPromise<void>();
+
 		const establishConnection = (): Promise<ImapSimple> => {
 
 			let searchCriteria = [
@@ -425,7 +425,11 @@ export class EmailReadImap implements INodeType {
 							}
 						} catch (error) {
 							Logger.error('Email Read Imap node encountered an error fetching new emails', { error });
-							throw error;
+							// Wait with resolving till the returnedPromise got resolved, else n8n will be unhappy
+							// if it receives an error before the workflow got activated
+							returnedPromise.promise().then(() => {
+								this.emitError(error as Error);
+							});
 						}
 					}
 				},
@@ -475,10 +479,12 @@ export class EmailReadImap implements INodeType {
 			await connection.end();
 		}
 
+		// Resolve returned-promise so that waiting errors can be emitted
+		returnedPromise.resolve();
+
 		return {
 			closeFunction,
 		};
-
 	}
 }