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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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/** * Checks if `value` is `null`. * * @param {any} value - The value to check. * @returns {value is null} Returns `true` if `value` is `null`, else `false`. * * @example * isNull(null); // true * isNull(undefined); // false * isNull(0); // false */ declare function isNull(value: any): value is null; export { isNull };