first commit

packages/nodes-base/nodes/Code/python-runner-unavailable.error.ts

@@ -0,0 +1,21 @@
+import { UserError } from 'n8n-workflow';
+
+type FailureReason = 'python' | 'venv';
+
+const REASONS: Record<FailureReason, string> = {
+	python: 'Python 3 is missing from this system',
+	venv: 'Virtual environment is missing from this system',
+};
+
+export class PythonRunnerUnavailableError extends UserError {
+	constructor(reason?: FailureReason) {
+		const message = reason
+			? `Python runner unavailable: ${REASONS[reason]}`
+			: 'Python runner unavailable';
+
+		super(message, {
+			description:
+				'Internal mode is intended only for debugging. For production, deploy in external mode: https://docs.n8n.io/hosting/configuration/task-runners/#setting-up-external-mode',
+		});
+	}
+}