From 3e0b9f2eba201c539a6c96421cf8e4ad2e3d5478 Mon Sep 17 00:00:00 2001
From: Jan Oberhauser <jan.oberhauser@gmail.com>
Date: Fri, 11 Dec 2020 18:15:07 +0100
Subject: [PATCH] :zap: Add "isEmpty" option to IF-Node

---
 packages/nodes-base/nodes/If.node.ts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/packages/nodes-base/nodes/If.node.ts b/packages/nodes-base/nodes/If.node.ts
index 447f985bac..f5965a877d 100644
--- a/packages/nodes-base/nodes/If.node.ts
+++ b/packages/nodes-base/nodes/If.node.ts
@@ -112,6 +112,10 @@ export class If implements INodeType {
 										name: 'Larger Equal',
 										value: 'largerEqual',
 									},
+									{
+										name: 'Is Empty',
+										value: 'isEmpty',
+									},
 								],
 								default: 'smaller',
 								description: 'Operation to decide where the the data should be mapped to.',
@@ -120,6 +124,13 @@ export class If implements INodeType {
 								displayName: 'Value 2',
 								name: 'value2',
 								type: 'number',
+								displayOptions: {
+									hide: {
+										operation: [
+											'isEmpty',
+										],
+									},
+								},
 								default: 0,
 								description: 'The value to compare with the first one.',
 							},
@@ -161,6 +172,10 @@ export class If implements INodeType {
 										name: 'Regex',
 										value: 'regex',
 									},
+									{
+										name: 'Is Empty',
+										value: 'isEmpty',
+									},
 								],
 								default: 'equal',
 								description: 'Operation to decide where the the data should be mapped to.',
@@ -172,6 +187,7 @@ export class If implements INodeType {
 								displayOptions: {
 									hide: {
 										operation: [
+											'isEmpty',
 											'regex',
 										],
 									},
@@ -242,6 +258,7 @@ export class If implements INodeType {
 			largerEqual: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) >= (value2 || 0),
 			smaller: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) < (value2 || 0),
 			smallerEqual: (value1: NodeParameterValue, value2: NodeParameterValue) => (value1 || 0) <= (value2 || 0),
+			isEmpty: (value1: NodeParameterValue) => [undefined, null, ''].includes(value1 as string),
 			regex: (value1: NodeParameterValue, value2: NodeParameterValue) => {
 				const regexMatch = (value2 || '').toString().match(new RegExp('^/(.*?)/([gimy]*)$'));