/**
 * Runs on BOTH server (SSR) and client — safe for data loading, initial state setup.
 * Call async operations here; executes before onMount.
 */
export declare function onInit(fn: () => void | Promise<void>): void;
/**
 * Runs on CLIENT ONLY after first render — DOM is available.
 * Never called during SSR.
 */
export declare function onMount(fn: () => void): void;
/**
 * Runs on CLIENT ONLY when component is removed / app.destroy() called.
 * Never called during SSR.
 */
export declare function onDestroy(fn: () => void): void;
/**
 * Reactive side effect. Runs immediately and re-runs whenever any signal read
 * inside fn() changes. Returns a dispose function that stops the effect.
 *
 * When called inside a component setup, the effect is automatically disposed
 * when the component is destroyed — no manual cleanup needed.
 *
 * @example
 * // Inside a component — auto-cleaned on destroy
 * effect(() => {
 *   chart.setData(prices()); // re-runs whenever prices changes
 * });
 *
 * // Standalone — dispose manually
 * const stop = effect(() => console.log('count:', count()));
 * stop(); // unsubscribe
 *
 * // With cleanup
 * effect(() => {
 *   const sub = store.subscribe(handler);
 *   return () => sub.unsubscribe(); // called before next run and on dispose
 * });
 */
export declare function effect(fn: () => void | (() => void)): () => void;
/**
 * Starts a repeating interval when the component mounts and clears it
 * automatically when the component is destroyed. Client-only.
 *
 * @example
 * useInterval(() => setTick(t => t + 1), 1000);
 */
export declare function useInterval(fn: () => void, ms: number): void;
/**
 * Schedules a one-shot timeout when the component mounts and cancels it
 * automatically if the component is destroyed before it fires. Client-only.
 *
 * Returns a `retrigger` function that resets the timer from event handlers —
 * each call cancels the pending timeout and starts a fresh one.
 *
 * @example
 * // Fire once at mount
 * useTimeout(() => setVisible(false), 3000);
 *
 * // Re-trigger on user activity (debounce pattern)
 * const resetIdle = useTimeout(() => setIdle(true), 5000);
 * return () => <div onMouseMove={resetIdle}>...</div>;
 */
export declare function useTimeout(fn: () => void, ms: number): () => void;