#prefer-global-number-constants

#Configuration

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

export default defineConfig([
  unicornPlugin.configs.recommended,
  {
    rules: {
      'unicorn/prefer-global-number-constants': 'error',
    },
  },
]);

#Rule Details

Prefer the global NaN, Infinity, and -Infinity constants over the corresponding properties of Number.

References to shadowed globals and assignment targets are excluded. Positive constants are automatically fixed only when no internal comment would be lost. Number.NEGATIVE_INFINITY is reported without an automatic fix to preserve expression precedence. This rule is the opposite of the checkNaN and checkInfinity options of prefer-number-properties.

Examples of incorrect code:

const value = Number.POSITIVE_INFINITY;

Examples of correct code:

const value = Infinity;

#Options

This rule has no options. It is enabled at error severity in unicornPlugin.configs.recommended.

The recommended preset explicitly disables checkNaN and checkInfinity on prefer-number-properties, retaining its other checks while preventing the rules from undoing each other's numeric-constant fixes.

#Differences from upstream

Unicorn v75.0.0 offers a fix for const {NaN: value} = Number that removes the value binding. This rule reports the destructuring use without a fix instead. Loop assignment targets, such as for (Number.NaN of values) {}, are left unchanged, consistently with other assignment targets.

Unlike upstream's flow-insensitive tracking, this rule follows only aliases initialized in a variable declaration and never reassigned. Conditional and logical receivers, default parameters, assignment expressions, and comma expressions are skipped. For example, after let N = Number; N = {NaN: 42};, N.NaN must not be replaced with NaN. This also preserves side effects in expressions such as (sideEffect(), Number).NaN. Stable aliases such as const N = Number; N.NaN still receive fixes.

#Original Documentation

• eslint-plugin-unicorn: prefer-global-number-constants
• Source code