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 /** @type {import('../shared/types').Rule} */
  13 module.exports = {
  14     meta: {
  15         type: "suggestion",
  16
  17         docs: {
  18             description: "Disallow `new` operators with the `String`, `Number`, and `Boolean` objects",
  19             recommended: false,
  20             url: "https://eslint.org/docs/rules/no-new-wrappers"
  21         },
  22
  23         schema: [],
  24
  25         messages: {
  26             noConstructor: "Do not use {{fn}} as a constructor."
  27         }
  28     },
  29
  30     create(context) {
  31
  32         return {
  33
  34             NewExpression(node) {
  35                 const wrapperObjects = ["String", "Number", "Boolean"];
  36
  37                 if (wrapperObjects.includes(node.callee.name)) {
  38                     context.report({
  39                         node,
  40                         messageId: "noConstructor",
  41                         data: { fn: node.callee.name }
  42                     });
  43                 }
  44             }
  45         };
  46
  47     }
  48 };