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es-toolkit

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A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

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const require_isNumber = require("./isNumber.js"); //#region src/compat/predicate/isNaN.ts /** * Checks if the value is NaN. * * @param value - The value to check. * @returns `true` if the value is NaN, `false` otherwise. * * @example * isNaN(NaN); // true * isNaN(0); // false * isNaN('NaN'); // false * isNaN(undefined); // false */ function isNaN(value) { return require_isNumber.isNumber(value) && Number.isNaN(Number(value)); } //#endregion exports.isNaN = isNaN;