/**
 * Returns `true` if the value is one of the type: `null`, `undefined` or `NaN`.
 *
 * @param {*} value The value to check.
 * @returns {boolean}
 */
export declare function isNullishOrNaN(value: unknown): boolean;
/**
 * Rounds a number to a specific number of decimal places.
 *
 * @param {number} value The value to round.
 * @param {number|boolean|string|undefined} [option] Either a number of decimal places to round to, a boolean or "auto".
 * @returns {string|number} The (possibly) rounded number as a string (for displaying the correct precision).
 */
export declare function roundFloat(value: number | string | undefined, option: unknown): string | number | undefined;