feat(core): Node hints(warnings) system (#8954)

packages/workflow/src/Interfaces.ts

@@ -392,7 +392,7 @@ export interface IGetExecuteTriggerFunctions {
 }
 
 export interface IRunNodeResponse {
-	data: INodeExecutionData[][] | null | undefined;
+	data: INodeExecutionData[][] | NodeExecutionOutput | null | undefined;
 	closeFunction?: CloseFunction;
 }
 export interface IGetExecuteFunctions {
@@ -1423,6 +1423,20 @@ export interface SupplyData {
 	closeFunction?: CloseFunction;
 }
 
+export class NodeExecutionOutput extends Array {
+	private hints: NodeExecutionHint[];
+
+	constructor(data: INodeExecutionData[][], hints: NodeExecutionHint[] = []) {
+		super();
+		this.push(...data);
+		this.hints = hints;
+	}
+
+	public getHints(): NodeExecutionHint[] {
+		return this.hints;
+	}
+}
+
 export interface INodeType {
 	description: INodeTypeDescription;
 	supplyData?(this: IAllExecuteFunctions, itemIndex: number): Promise<SupplyData>;
@@ -1745,9 +1759,20 @@ export interface INodeTypeDescription extends INodeTypeBaseDescription {
 		  }
 		| boolean;
 	extendsCredential?: string;
+	hints?: NodeHint[];
 	__loadOptionsMethods?: string[]; // only for validation during build
 }
 
+export type NodeHint = {
+	message: string;
+	type?: 'info' | 'warning' | 'danger';
+	location?: 'outputPane' | 'inputPane' | 'ndv';
+	displayCondition?: string;
+	whenToDisplay?: 'always' | 'beforeExecution' | 'afterExecution';
+};
+
+export type NodeExecutionHint = Omit<NodeHint, 'whenToDisplay' | 'displayCondition'>;
+
 export interface INodeHookDescription {
 	method: string;
 }
@@ -1929,6 +1954,7 @@ export interface ITaskData {
 	data?: ITaskDataConnections;
 	inputOverride?: ITaskDataConnections;
 	error?: ExecutionError;
+	hints?: NodeExecutionHint[];
 	source: Array<ISourceData | null>; // Is an array as nodes have multiple inputs
 	metadata?: ITaskMetadata;
 }