Calling `close()` removes all event listeners (including "error")

When a SerialPort is closed by calling close(), all event listeners are removed (as per the documentation). This behavior might be undesired.

If one calls write on a closed serial port connection without passing a callback to the write method, an “error” event is emitted by default. So, calling port.write(buf); on a closed serial port can cause an “error” event to be emitted without an “error” event handler (even if the user created an “error” event handler before the SerialPort was closed). In this case, the default Node behavior for this is to throw an exception, which could crash the program.

[reconbot]

fixed in 3.0.0

[reconbot]

Tracking in #702