/**
   * @fileoverview A rule to disallow negated left operands of the `in` operator
   * @author Michael Ficarra
   * @deprecated in ESLint v3.3.0
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "disallow negating the left operand in `in` expressions",
              category: "Possible Errors",
              recommended: false,
              replacedBy: ["no-unsafe-negation"]
          },
          deprecated: true,
  
          schema: []
      },
  
      create(context) {
  
          return {
  
              BinaryExpression(node) {
                  if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") {
                      context.report({ node, message: "The 'in' expression's left operand is negated." });
                  }
              }
          };
  
      }
  };