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

   1 /**
   2  * @fileoverview Rule to flag when using constructor for wrapper objects
   3  * @author Ilya Volodin
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Rule Definition
  10 //------------------------------------------------------------------------------
  11
  12 module.exports = {
  13     meta: {
  14         type: "suggestion",
  15
  16         docs: {
  17             description: "disallow `new` operators with the `String`, `Number`, and `Boolean` objects",
  18             recommended: false,
  19             url: "https://eslint.org/docs/rules/no-new-wrappers"
  20         },
  21
  22         schema: [],
  23
  24         messages: {
  25             noConstructor: "Do not use {{fn}} as a constructor."
  26         }
  27     },
  28
  29     create(context) {
  30
  31         return {
  32
  33             NewExpression(node) {
  34                 const wrapperObjects = ["String", "Number", "Boolean"];
  35
  36                 if (wrapperObjects.indexOf(node.callee.name) > -1) {
  37                     context.report({
  38                         node,
  39                         messageId: "noConstructor",
  40                         data: { fn: node.callee.name }
  41                     });
  42                 }
  43             }
  44         };
  45
  46     }
  47 };