/**
 * Creates a new function that can only be called once. Subsequent calls to the
 * returned function will always return the same result as the first call.
 *
 * @since 1.0.0
 *
 * @param {Function} fn - The function to be called once
 * @returns {Function} - A function that can only be called once
 *
 * @example
 *
 * const add = (a, b) => a + b;
 * const addOnce = once(add);
 *
 * console.log(addOnce(2, 3)); // => 5
 * console.log(addOnce(4, 5)); // => 5
 */
declare const once: (fn: Function) => Function;
export default once;