/**
 * Creates a function that is restricted to invoking the provided function `func` once.
 * Repeated calls to the function will return the value from the first invocation.
 *
 * @template F - The type of function.
 * @param {F extends () => any} func - The function to restrict.
 * @returns {F} A new function that invokes `func` once and caches the result.
 *
 * @example
 * const initialize = once(() => {
 *   console.log('Initialized!');
 *   return true;
 * });
 *
 * initialize(); // Logs: 'Initialized!' and returns true
 * initialize(); // Returns true without logging
 */
declare function once<F extends () => any>(func: F): F;
/**
 * Creates a function that is restricted to invoking the provided function `func` once.
 * Repeated calls to the function will return the value from the first invocation.
 *
 * @template F - The type of function.
 * @param {F extends (...args: any[]) => void} func - The function to restrict with arguments.
 * @returns {F} A new function that invokes `func` once.
 *
 * @example
 * const log = once(console.log);
 *
 * log('Hello, world!'); // prints 'Hello, world!' and doesn't return anything
 * log('Hello, world!'); // doesn't print anything and doesn't return anything
 */
declare function once<F extends (...args: any[]) => void>(func: F): F;

export { once };