feat(core): Add support for pairedItem (beta) (#3012)

* ✨ Add pairedItem support

* 👕 Fix lint issue

* 🐛 Fix resolution in frontend

* 🐛 Fix resolution issue

* 🐛 Fix resolution in frontend

* 🐛 Fix another resolution issue in frontend

* ⚡ Try to automatically add pairedItem data if possible

* ⚡ Cleanup

* ⚡ Display expression errors in editor UI

* 🐛 Fix issue that it did not display errors in production

* 🐛 Fix auto-fix of missing pairedItem data

* 🐛 Fix frontend resolution for not executed nodes

* ⚡ Fail execution on pairedItem resolve issue and display information
about itemIndex and runIndex

* ⚡ Allow that pairedItem is only set to number if runIndex is 0

* ✨ Improve Expression Errors

* ⚡ Remove no longer needed code

* ⚡ Make errors more helpful

* ⚡ Add additional errors

* 👕 Fix lint issue

* ⚡ Add pairedItem support to core nodes

* ⚡ Improve support in Merge-Node

* ⚡ Fix issue with not correctly converted incoming pairedItem data

* 🐛 Fix frontend resolve issue

* 🐛 Fix frontend parameter name display issue

* ⚡ Improve errors

* 👕 Fix lint issue

* ⚡ Improve errors

* ⚡ Make it possible to display parameter name in error messages

* ⚡ Improve error messages

* ⚡ Fix error message

* ⚡ Improve error messages

* ⚡ Add another error message

* ⚡ Simplify

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

@@ -1232,6 +1232,9 @@ export class HttpRequest implements INodeType {
 							json: {
 								error: response.reason,
 							},
+							pairedItem: {
+								item: itemIndex,
+							},
 						},
 					);
 					continue;
@@ -1251,6 +1254,9 @@ export class HttpRequest implements INodeType {
 				const newItem: INodeExecutionData = {
 					json: {},
 					binary: {},
+					pairedItem: {
+						item: itemIndex,
+					},
 				};
 
 				if (items[itemIndex].binary !== undefined) {
@@ -1295,12 +1301,20 @@ export class HttpRequest implements INodeType {
 
 						returnItem[property] = response![property];
 					}
-					returnItems.push({ json: returnItem });
+					returnItems.push({
+						json: returnItem,
+						pairedItem: {
+							item: itemIndex,
+						},
+					});
 				} else {
 					returnItems.push({
 						json: {
 							[dataPropertyName]: response,
 						},
+						pairedItem: {
+							item: itemIndex,
+						},
 					});
 				}
 			} else {
@@ -1319,7 +1333,12 @@ export class HttpRequest implements INodeType {
 						}
 					}
 
-					returnItems.push({ json: returnItem });
+					returnItems.push({
+						json: returnItem,
+						pairedItem: {
+							item: itemIndex,
+						},
+					});
 				} else {
 					if (responseFormat === 'json' && typeof response === 'string') {
 						try {
@@ -1330,9 +1349,19 @@ export class HttpRequest implements INodeType {
 					}
 
 					if (options.splitIntoItems === true && Array.isArray(response)) {
-						response.forEach(item => returnItems.push({ json: item }));
+						response.forEach(item => returnItems.push({
+							json: item,
+							pairedItem: {
+								item: itemIndex,
+							},
+						}));
 					} else {
-						returnItems.push({ json: response });
+						returnItems.push({
+							json: response,
+							pairedItem: {
+								item: itemIndex,
+							},
+						});
 					}
 				}
 			}