const Sandbox = require('backstage-functions-sandbox');

const mySandbox = new Sandbox({
  env: {
     MY_VAR: 'TRUE', // environment variable will be available on Backstage.env.MY_VAR
  },
  globalModules: [ 'path' ], // put all available modules that will allow to import
  asyncTimeout: 10000,
  syncTimeout: 300,
});

const myCode = mySandbox.compileCode('test.js', `
  async function main(req, res) {
    const result = req.body.x * req.body.y;
    const name = Backstage.env.MY_VAR;
    // you could call await here
    return { name, result };
  }
`);

// express.Request compatible
const req = {
  headers: {},
  query: {},
  body: { x: 10, y: 10}
};

mySandbox.runScript(myCode, req).then(({status, body}) => {
  console.info('Result:', status, body);
}, (err) => {
  console.error('Error:', err);
});