execute method
For internal use only. Implementation detail that may change anytime.
Evaluates the JavaScript statement given.
Implementation
void execute(String statement) {
  final controller = _webViewController;
  if (_completer.isCompleted) {
    if (kDebugMode) {
      print('📗 session.execute: $statement');
    }
    controller!.evaluateJavascript(source: statement);
  } else {
    if (kDebugMode) {
      print('📘 session.execute: $statement');
    }
    this._pending.add(statement);
  }
}