/**
 * Perfect Reactivity - Effect
 *
 * Side effects that automatically re-run when their dependencies change.
 */
/**
 * Effect handle with dispose method
 */
export interface IEffect {
    /**
     * Dispose effect and stop tracking dependencies
     */
    dispose(): void;
}
/**
 * Create and run an effect that tracks dependencies
 *
 * Effects are batched and scheduled for optimal performance.
 * They run immediately on creation and again whenever dependencies change.
 *
 * @param fn - Effect function
 * @returns Effect handle with dispose method
 *
 * @example
 * ```ts
 * const count = signal(0);
 *
 * const dispose = effect(() => {
 *   console.log('Count:', count.read());
 * });
 * // Logs: "Count: 0"
 *
 * count.write(1);
 * // Logs: "Count: 1"
 *
 * dispose(); // Stop tracking
 * ```
 */
export declare function effect(fn: () => void): IEffect;