/**
 * Creates a function that is restricted to be called only once.
 * Subsequent calls return the result of the first invocation.
 *
 * @param function_ - The function to restrict.
 * @returns A function that invokes the original only on its first call.
 *
 * @example
 * ```typescript
 * const initialize = once(() => {
 *   console.log("initialized");
 *   return 42;
 * });
 * initialize(); // logs "initialized", returns 42
 * initialize(); // returns 42 (no log)
 * ```
 */
export declare const once: <A extends unknown[], R>(function_: (...arguments_: A) => R) => ((...arguments_: A) => R);