public JsAssignmentExpression(JsExpression left, JsExpression right, BinaryOperatorType? @operator = null)
 {
     this.@operator = @operator;
     this.Left      = left;
     this.Right     = right;
 }
 public JsBinaryExpression(JsExpression left, BinaryOperatorType @operator, JsExpression right)
 {
     this.@operator = @operator;
     this.Left      = left;
     this.Right     = right;
 }