fix(core): Fix property existence checks on AugmentObject (#6842)

Fixes https://community.n8n.io/t/code-node-returns-full-item-object-on-node-all/28823

packages/workflow/src/AugmentObject.ts

@@ -33,7 +33,7 @@ export function augmentArray<T>(data: T[]): T[] {
 			return Reflect.deleteProperty(getData(), key);
 		},
 		get(target, key: string, receiver): unknown {
-			const value = Reflect.get(newData !== undefined ? newData : target, key, receiver) as unknown;
+			const value = Reflect.get(newData ?? target, key, receiver) as unknown;
 			const newValue = augment(value);
 			if (newValue !== value) {
 				newData = getData();
@@ -54,10 +54,10 @@ export function augmentArray<T>(data: T[]): T[] {
 			return Object.getOwnPropertyDescriptor(data, key) ?? defaultPropertyDescriptor;
 		},
 		has(target, key) {
-			return Reflect.has(newData !== undefined ? newData : target, key);
+			return Reflect.has(newData ?? target, key);
 		},
 		ownKeys(target) {
-			return Reflect.ownKeys(newData !== undefined ? newData : target);
+			return Reflect.ownKeys(newData ?? target);
 		},
 		set(target, key: string, newValue: unknown) {
 			// Always proxy all objects. Like that we can check in get simply if it
@@ -134,8 +134,7 @@ export function augmentObject<T extends object>(data: T): T {
 		},
 		has(target, key) {
 			if (deletedProperties.indexOf(key) !== -1) return false;
-			const newKeys = Object.keys(newData);
-			return Reflect.has(newKeys.length ? newData : target, key);
+			return Reflect.has(newData, key) || Reflect.has(target, key);
 		},
 		ownKeys(target) {
 			const originalKeys = Reflect.ownKeys(target);

packages/workflow/test/AugmentObject.test.ts

@@ -570,6 +570,7 @@ describe('AugmentObject', () => {
 
 			augmentedObject.x.z = 5;
 			expect('z' in augmentedObject.x).toBe(true);
+			expect('y' in augmentedObject.x).toBe(true);
 		});
 	});
 });