eslint/lib/rules/no-new-object.js

   1 /**
   2  * @fileoverview A rule to disallow calls to the Object constructor
   3  * @author Matt DuVall <http://www.mattduvall.com/>
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const astUtils = require("./utils/ast-utils");
  13
  14 //------------------------------------------------------------------------------
  15 // Rule Definition
  16 //------------------------------------------------------------------------------
  17
  18 module.exports = {
  19     meta: {
  20         type: "suggestion",
  21
  22         docs: {
  23             description: "disallow `Object` constructors",
  24             recommended: false,
  25             url: "https://eslint.org/docs/rules/no-new-object"
  26         },
  27
  28         schema: [],
  29
  30         messages: {
  31             preferLiteral: "The object literal notation {} is preferrable."
  32         }
  33     },
  34
  35     create(context) {
  36         return {
  37             NewExpression(node) {
  38                 const variable = astUtils.getVariableByName(
  39                     context.getScope(),
  40                     node.callee.name
  41                 );
  42
  43                 if (variable && variable.identifiers.length > 0) {
  44                     return;
  45                 }
  46
  47                 if (node.callee.name === "Object") {
  48                     context.report({
  49                         node,
  50                         messageId: "preferLiteral"
  51                     });
  52                 }
  53             }
  54         };
  55     }
  56 };