description

# addEventListener method

void addEventListener(

1. String type,
2. EventListener? listener, [
3. bool? useCapture

])

## Implementation

    void addEventListener(
      String type,
      EventListener? listener, [
      bool? useCapture,
    ]) {
      // TODO(leafp): This check is avoid a bug in our dispatch code when
      // listener is null.  The browser treats this call as a no-op in this
      // case, so it's fine to short-circuit it, but we should not have to.
      if (listener != null) {
        _addEventListener(type, listener, useCapture);
      }
    }