/**
   * @fileoverview Rule to flag for-in loops without if statements inside
   * @author Nicholas C. Zakas
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "require `for-in` loops to include an `if` statement",
              category: "Best Practices",
              recommended: false
          },
  
          schema: []
      },
  
      create(context) {
  
          return {
  
              ForInStatement(node) {
  
                  /*
                   * If the for-in statement has {}, then the real body is the body
                   * of the BlockStatement. Otherwise, just use body as provided.
                   */
                  const body = node.body.type === "BlockStatement" ? node.body.body[0] : node.body;
  
                  if (body && body.type !== "IfStatement") {
                      context.report({ node, message: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype." });
                  }
              }
          };
  
      }
  };