no-shadow-restricted-names.md

Pattern: Redefinition of built-in global name

Issue: -

Description

Redefining built-in globals like undefined, NaN, Infinity, eval, and arguments can break code in unexpected ways. These identifiers have special meaning in JavaScript and should not be used as variable names, parameters, or catch clause bindings.

Examples

Example of incorrect code:

function undefined() {}
var NaN = 5;
let Infinity = 42;

function test(eval) {
  console.log(eval);
}

try {
  throw new Error();
} catch(arguments) {
  console.log(arguments);
}

Example of correct code:

function myFunc() {}
var notANumber = 5;
let counter = 42;

function test(evalParam) {
  console.log(evalParam);
}

try {
  throw new Error();
} catch(error) {
  console.log(error);
}