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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text/typescript
//#region src/compat/predicate/isNaN.d.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
*/
declare function isNaN(value?: any): boolean;
//#endregion
export { isNaN };