How to use the n8n-workflow.Workflow function in n8n-workflow

try {
				tempNode = new tempModule[className]() as INodeType;
			} catch (error) {
				throw new Error(`Error loading node "${nodeTypeName}" from: "${filePath}"`);
			}

			nodeTypesData[nodeTypeName] = {
				type: tempNode,
				sourcePath: filePath,
			};
		}

		const nodeTypes = NodeTypes();
		await nodeTypes.init(nodeTypesData);

		this.workflow = new Workflow(this.data.workflowData.id as string | undefined, this.data.workflowData!.nodes, this.data.workflowData!.connections, this.data.workflowData!.active, nodeTypes, this.data.workflowData!.staticData);
		const additionalData = await WorkflowExecuteAdditionalData.getBase(this.data.credentials);
		additionalData.hooks = this.getProcessForwardHooks();

		if (this.data.executionData !== undefined) {
			this.workflowExecute = new WorkflowExecute(additionalData, this.data.executionMode, this.data.executionData);
			return this.workflowExecute.processRunExecutionData(this.workflow);
		} else if (this.data.runData === undefined || this.data.startNodes === undefined || this.data.startNodes.length === 0 || this.data.destinationNode === undefined) {
			// Execute all nodes

			// Can execute without webhook so go on
			this.workflowExecute = new WorkflowExecute(additionalData, this.data.executionMode);
			return this.workflowExecute.run(this.workflow, undefined, this.data.destinationNode);
		} else {
			// Execute only the nodes between start and destination nodes
			this.workflowExecute = new WorkflowExecute(additionalData, this.data.executionMode);
			return this.workflowExecute.runPartialWorkflow(this.workflow, this.data.runData, this.data.startNodes, this.data.destinationNode);

const mode = 'integrated';

	if (Db.collections!.Workflow === null) {
		// The first time executeWorkflow gets called the Database has
		// to get initialized first
		await Db.init();
	}

	const workflowData = await Db.collections!.Workflow!.findOne(workflowId);
	if (workflowData === undefined) {
		throw new Error(`The workflow with the id "${workflowId}" does not exist.`);
	}

	const nodeTypes = NodeTypes();

	const workflow = new Workflow(workflowId as string | undefined, workflowData!.nodes, workflowData!.connections, workflowData!.active, nodeTypes, workflowData!.staticData);

	// Does not get used so set it simply to empty string
	const executionId = '';

	// Create new additionalData to have different workflow loaded and to call
	// different webooks
	const additionalDataIntegrated = await getBase(additionalData.credentials);
	additionalDataIntegrated.hooks = getWorkflowHooksIntegrated(mode, executionId, workflowData, { parentProcessMode: additionalData.hooks!.mode });

	// Find Start-Node
	const requiredNodeTypes = ['n8n-nodes-base.start'];
	let startNode: INode | undefined;
	for (const node of workflowData!.nodes) {
		if (requiredNodeTypes.includes(node.type)) {
			startNode = node;
			break;

export async function executeErrorWorkflow(workflowId: string, workflowErrorData: IWorkflowErrorData): Promise {
	// Wrap everything in try/catch to make sure that no errors bubble up and all get caught here
	try {
		const workflowData = await Db.collections.Workflow!.findOne({ id: workflowId });

		if (workflowData === undefined) {
			// The error workflow could not be found
			console.error(`ERROR: Calling Error Workflow for "${workflowErrorData.workflow.id}". Could not find error workflow "${workflowId}"`);
			return;
		}

		const executionMode = 'error';
		const nodeTypes = NodeTypes();

		const workflowInstance = new Workflow(workflowId, workflowData.nodes, workflowData.connections, workflowData.active, nodeTypes, workflowData.staticData, workflowData.settings);


		let node: INode;
		let workflowStartNode: INode | undefined;
		for (const nodeName of Object.keys(workflowInstance.nodes)) {
			node = workflowInstance.nodes[nodeName];
			if (node.type === ERROR_TRIGGER_TYPE) {
				workflowStartNode = node;
			}
		}

		if (workflowStartNode === undefined) {
			console.error(`ERROR: Calling Error Workflow for "${workflowErrorData.workflow.id}". Could not find "${ERROR_TRIGGER_TYPE}" in workflow "${workflowId}"`);
			return;
		}

const runData: IRunData | undefined = req.body.runData;
			const startNodes: string[] | undefined = req.body.startNodes;
			const destinationNode: string | undefined = req.body.destinationNode;
			const executionMode = 'manual';

			const sessionId = GenericHelpers.getSessionId(req);

			// Check if workflow is saved as webhooks can only be tested with saved workflows.
			// If that is the case check if any webhooks calls are present we have to wait for and
			// if that is the case wait till we receive it.
			if (WorkflowHelpers.isWorkflowIdValid(workflowData.id) === true && (runData === undefined || startNodes === undefined || startNodes.length === 0 || destinationNode === undefined)) {
				// Webhooks can only be tested with saved workflows
				const credentials = await WorkflowCredentials(workflowData.nodes);
				const additionalData = await WorkflowExecuteAdditionalData.getBase(credentials);
				const nodeTypes = NodeTypes();
				const workflowInstance = new Workflow(workflowData.id, workflowData.nodes, workflowData.connections, false, nodeTypes, undefined, workflowData.settings);
				const needsWebhook = await this.testWebhooks.needsWebhookData(workflowData, workflowInstance, additionalData, executionMode, sessionId, destinationNode);
				if (needsWebhook === true) {
					return {
						waitingForWebhook: true,
					};
				}
			}

			// For manual testing always set to not active
			workflowData.active = false;

			const credentials = await WorkflowCredentials(workflowData.nodes);

			// Start the workflow
			const data: IWorkflowExecutionDataProcess = {
				credentials,

async add(workflowId: string, workflowData?: IWorkflowDb): Promise {
		if (this.activeWorkflows === null) {
			throw new Error(`The "activeWorkflows" instance did not get initialized yet.`);
		}

		let workflowInstance: Workflow;
		try {
			if (workflowData === undefined) {
				workflowData = await Db.collections.Workflow!.findOne(workflowId) as IWorkflowDb;
			}

			if (!workflowData) {
				throw new Error(`Could not find workflow with id "${workflowId}".`);
			}
			const nodeTypes = NodeTypes();
			workflowInstance = new Workflow(workflowId, workflowData.nodes, workflowData.connections, workflowData.active, nodeTypes, workflowData.staticData, workflowData.settings);

			const canBeActivated = workflowInstance.checkIfWorkflowCanBeActivated(['n8n-nodes-base.start']);
			if (canBeActivated === false) {
				throw new Error(`The workflow can not be activated because it does not contain any nodes which could start the workflow. Only workflows which have trigger or webhook nodes can be activated.`);
			}

			const mode = 'trigger';
			const credentials = await WorkflowCredentials(workflowData.nodes);
			const additionalData = await WorkflowExecuteAdditionalData.getBase(credentials);
			const getTriggerFunctions = this.getExecuteTriggerFunctions(workflowData, additionalData, mode);

			// Add the workflows which have webhooks defined
			await this.addWorkflowWebhooks(workflowInstance, additionalData, mode);
			await this.activeWorkflows.add(workflowId, workflowInstance, additionalData, getTriggerFunctions);

			if (this.activationErrors[workflowId] !== undefined) {

return {
							description: nodeTypeDescription,
						};
					},
				};

				let workflowId = this.$store.getters.workflowId;
				if (workflowId !== PLACEHOLDER_EMPTY_WORKFLOW_ID) {
					workflowId = undefined;
				}

				if (copyData === true) {
					return new Workflow(workflowId, JSON.parse(JSON.stringify(nodes)), JSON.parse(JSON.stringify(connections)), false, nodeTypes);
				} else {
					return new Workflow(workflowId, nodes, connections, false, nodeTypes);
				}
			},

0,
			]
		};

		if (credentials) {
			nodeData.credentials = credentials;
		}

		const workflowData = {
			nodes: [
				nodeData,
			],
			connections: {},
		};

		this.workflow = new Workflow(undefined, workflowData.nodes, workflowData.connections, false, nodeTypes, undefined);
	}

return undefined;
						}

						return {
							description: nodeTypeDescription,
						};
					},
				};

				let workflowId = this.$store.getters.workflowId;
				if (workflowId !== PLACEHOLDER_EMPTY_WORKFLOW_ID) {
					workflowId = undefined;
				}

				if (copyData === true) {
					return new Workflow(workflowId, JSON.parse(JSON.stringify(nodes)), JSON.parse(JSON.stringify(connections)), false, nodeTypes);
				} else {
					return new Workflow(workflowId, nodes, connections, false, nodeTypes);
				}
			},