/**
   * @fileoverview Disallow string concatenation when using __dirname and __filename
   * @author Nicholas C. Zakas
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "disallow string concatenation with `__dirname` and `__filename`",
              category: "Node.js and CommonJS",
              recommended: false
          },
  
          schema: []
      },
  
      create(context) {
  
          const MATCHER = /^__(?:dir|file)name$/;
  
          //--------------------------------------------------------------------------
          // Public
          //--------------------------------------------------------------------------
  
          return {
  
              BinaryExpression(node) {
  
                  const left = node.left,
                      right = node.right;
  
                  if (node.operator === "+" &&
                          ((left.type === "Identifier" && MATCHER.test(left.name)) ||
                          (right.type === "Identifier" && MATCHER.test(right.name)))
                  ) {
  
                      context.report({ node, message: "Use path.join() or path.resolve() instead of + to create paths." });
                  }
              }
  
          };
  
      }
  };