code: function isOneLiner(node) {
              const first = sourceCode.getFirstToken(node),
                  last = sourceCode.getLastToken(node);
  
              return first.loc.start.line === last.loc.end.line;
          }
docs: Determines if a given node is a one-liner.
  @param {ASTNode} node The node to check.
  @returns {boolean} True if the node is a one-liner.
  @private