eslint/lib/rules/no-prototype-builtins.js

   1 /**
   2  * @fileoverview Rule to disallow use of Object.prototype builtins on objects
   3  * @author Andrew Levine
   4  */
   5 "use strict";
   6
   7 //------------------------------------------------------------------------------
   8 // Rule Definition
   9 //------------------------------------------------------------------------------
  10
  11 module.exports = {
  12     meta: {
  13         type: "problem",
  14
  15         docs: {
  16             description: "disallow calling some `Object.prototype` methods directly on objects",
  17             category: "Possible Errors",
  18             recommended: true,
  19             url: "https://eslint.org/docs/rules/no-prototype-builtins"
  20         },
  21
  22         schema: [],
  23
  24         messages: {
  25             prototypeBuildIn: "Do not access Object.prototype method '{{prop}}' from target object."
  26         }
  27     },
  28
  29     create(context) {
  30         const DISALLOWED_PROPS = [
  31             "hasOwnProperty",
  32             "isPrototypeOf",
  33             "propertyIsEnumerable"
  34         ];
  35
  36         /**
  37          * Reports if a disallowed property is used in a CallExpression
  38          * @param {ASTNode} node The CallExpression node.
  39          * @returns {void}
  40          */
  41         function disallowBuiltIns(node) {
  42             if (node.callee.type !== "MemberExpression" || node.callee.computed) {
  43                 return;
  44             }
  45             const propName = node.callee.property.name;
  46
  47             if (DISALLOWED_PROPS.indexOf(propName) > -1) {
  48                 context.report({
  49                     messageId: "prototypeBuildIn",
  50                     loc: node.callee.property.loc,
  51                     data: { prop: propName },
  52                     node
  53                 });
  54             }
  55         }
  56
  57         return {
  58             CallExpression: disallowBuiltIns
  59         };
  60     }
  61 };