n8n/packages/workflow/test/setup-vm-evaluator.ts

import { Expression } from '../src/expression';

// Only runs when N8N_EXPRESSION_ENGINE=vm is set.
// Initializes the VM evaluator once per vitest worker before all tests,
// and disposes it after.
if (process.env.N8N_EXPRESSION_ENGINE === 'vm') {
	beforeAll(async () => {
		await Expression.initExpressionEngine({
			engine: 'vm',
			poolSize: 1,
			maxCodeCacheSize: 1024,
			bridgeTimeout: 5000,
			bridgeMemoryLimit: 128,
		});
	});

	afterAll(async () => {
		await Expression.disposeExpressionEngine();
	});
}