I'm not familiar with any libraries that do this, but it's not hard to wire up yourself.

// Setup the timeout handler

var timeoutProtect = setTimeout(function() {



  // Clear the local timer variable, indicating the timeout has been triggered.

  timeoutProtect = null;



  // Execute the callback with an error argument.

  callback({error:'async timed out'});



}, 5000);



// Call the async function

asyncFunction(arguments, function() {



  // Proceed only if the timeout handler has not yet fired.

  if (timeoutProtect) {



    // Clear the scheduled timeout handler

    clearTimeout(timeoutProtect);



    // Run the real callback.

    callback();

  }

});