#no-new-wrappers

#Configuration

import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-new-wrappers': 'error',
    },
  },
]);

#Rule Details

Disallows the use of new operators with String, Number, and Boolean as constructors. There are three primitive types in JavaScript that have wrapper objects: string, number, and boolean. These are represented by the constructors String, Number, and Boolean, respectively. Using these constructors to create new instances is generally considered bad practice because the primitive wrapper objects behave differently than their primitive counterparts in certain cases (e.g., typeof new Boolean(false) returns "object").

Examples of incorrect code for this rule:

var stringObject = new String('Hello world');
var numberObject = new Number(33);
var booleanObject = new Boolean(false);

Examples of correct code for this rule:

var text = String(someValue);
var num = Number('33');
var bool = Boolean(someValue);

#Original Documentation

• ESLint no-new-wrappers