/**
 * Checks if a given date is yesterday.
 *
 * This function determines whether the provided date corresponds to the day
 * before the current date. It returns true if the date is yesterday, otherwise
 * it returns false.
 *
 * @param {Date} date - The date to check.
 * @returns {boolean} - `true` if the date is yesterday, `false` otherwise.
 */
export declare function isYesterday(date: Date | string | number): boolean;