old_contents: #!/usr/bin/env node
  
  let didSend = false;
  
  // Node 0.10 does not have 'beforeExit'
  // process.send is synchronous on 0.10 and 0.12
  process.on('exit', function sendCovereageOnExit() {
    if (!didSend) {
      didSend = true;
      process.send({coverage: global.__coverage__});
    }
  });
  
  // process.send takes a callback on Node 4+ and should be called in beforeExit
  // process.send will schedule more work, so we check to only send once
  process.on('beforeExit', function sendCovereageOnBeforeExit() {
    if (!didSend) {
      didSend = true;
      process.send({coverage: global.__coverage__});
    }
  });
  
new_contents: #!/usr/bin/env node
  
  let didSend = false;
  
  // process.send takes a callback on Node 4+ and should be called in beforeExit
  // process.send will schedule more work, so we check to only send once
  process.on('beforeExit', function sendCovereageOnBeforeExit() {
    if (!didSend) {
      didSend = true;
      process.send({coverage: global.__coverage__});
    }
  });
  
subject: Drop exit handler used by node versions <4