const InspectorProxy = require('inspector-proxy');
const cfork = require('cfork');
const proxy = new InspectorProxy({ port: 9229 });

// use cfork to inspect file
cfork({
  exec: './test.js',
  execArgv: [ '--inspect' ],
  count: 1,
  refork: true,
}).on('fork', worker => {
  let port;
  // match debug port from argv
  worker.process.spawnargs
    .some(arg => {
      let matches;
      // node-6: --inspect=9888
      // node-8: --inspect-port=9888
      if (arg.startsWith('--inspect') && (matches = arg.match(/\d+/))) {
        port = matches[0];
        return true;
      }
      return false;
    });

  proxy.start({ debugPort: port })
    .then(() => {
      console.log(`\nproxy url: ${proxy.url}\n`);
    });
});