✨ Make special variables like $node, $parameter, ... accessible

in Function Nodes

packages/workflow/src/Interfaces.ts

@@ -154,6 +154,7 @@ export interface IExecuteFunctions {
 	getInputData(inputIndex?: number, inputName?: string): INodeExecutionData[];
 	getMode(): WorkflowExecuteMode;
 	getNodeParameter(parameterName: string, itemIndex: number, fallbackValue?: any): NodeParameterValue | INodeParameters | NodeParameterValue[] | INodeParameters[] | object; //tslint:disable-line:no-any
+	getWorkflowDataProxy(itemIndex: number): IWorkflowDataProxyData;
 	getWorkflowStaticData(type: string): IDataObject;
 	getTimezone(): string;
 	prepareOutputData(outputData: INodeExecutionData[], outputIndex?: number): Promise<INodeExecutionData[][]>;
@@ -170,6 +171,7 @@ export interface IExecuteSingleFunctions {
 	getMode(): WorkflowExecuteMode;
 	getNodeParameter(parameterName: string, fallbackValue?: any): NodeParameterValue | INodeParameters | NodeParameterValue[] | INodeParameters[] | object; //tslint:disable-line:no-any
 	getTimezone(): string;
+	getWorkflowDataProxy(): IWorkflowDataProxyData;
 	getWorkflowStaticData(type: string): IDataObject;
 	helpers: {
 		[key: string]: (...args: any[]) => any //tslint:disable-line:no-any
@@ -466,6 +468,14 @@ export interface IWebhookDescription {
 	responseData?: WebhookResponseData | string;
 }
 
+export interface IWorkflowDataProxyData {
+	$binary: any; // tslint:disable-line:no-any
+	$data: any; // tslint:disable-line:no-any
+	$env: any; // tslint:disable-line:no-any
+	$node: any; // tslint:disable-line:no-any
+	$parameter: any; // tslint:disable-line:no-any
+}
+
 export type WebhookHttpMethod = 'GET' | 'POST';
 
 export interface IWebhookResonseData {

packages/workflow/src/WorkflowDataProxy.ts

@@ -1,8 +1,9 @@
 import {
 	IDataObject,
 	INodeExecutionData,
-	NodeHelpers,
 	IRunExecutionData,
+	IWorkflowDataProxyData,
+	NodeHelpers,
 	Workflow,
 } from './';
 
@@ -184,12 +185,12 @@ export class WorkflowDataProxy {
 						return executionData[that.itemIndex].json;
 					} else if (name === 'binary') {
 						// Binary-Data
-						if (!executionData[that.itemIndex].binary) {
-							throw new Error(`No binary data for node "${nodeName}" has been found!`);
-						}
-
 						const returnData: IDataObject = {};
 
+						if (!executionData[that.itemIndex].binary) {
+							return returnData;
+						}
+
 						const binaryKeyData = executionData[that.itemIndex].binary!;
 						for (const keyName of Object.keys(binaryKeyData)) {
 
@@ -263,7 +264,7 @@ export class WorkflowDataProxy {
 	 * @returns
 	 * @memberof WorkflowDataGetter
 	 */
-	getDataProxy() {
+	getDataProxy(): IWorkflowDataProxyData {
 		const that = this;
 
 		const base = {