code: function isMixedWithParent(node) {
              return (
                  node.operator !== node.parent.operator &&
                  !astUtils.isParenthesised(sourceCode, node)
              );
          }
docs: Checks whether the operator of a given node is mixed with parent
  node's operator or not.
  
  @param {ASTNode} node - A node to check. This is a BinaryExpression
  node or a LogicalExpression node. This parent node is one of
  them, too.
  @returns {boolean} `true` if the node was mixed.