/**
 * Effect - Run side effects reactively.
 */
/**
 * Create a reactive effect that automatically tracks dependencies
 * and re-runs when they change.
 *
 * The effect function can optionally return a cleanup function that will be
 * called before the effect re-runs and when the effect is disposed.
 *
 * @param fn - The effect function to run. May return a cleanup function.
 * @returns A dispose function to stop the effect
 *
 * @example
 * const count = signal(0);
 * const dispose = effect(() => {
 *   console.log("Count is:", count.value);
 * });
 *
 * count.value = 1; // logs: "Count is: 1"
 * dispose(); // stop the effect
 *
 * @example
 * // With cleanup function
 * const userId = signal(1);
 * const dispose = effect(() => {
 *   const subscription = api.subscribe(userId.value);
 *   return () => subscription.unsubscribe(); // cleanup
 * });
 *
 * userId.value = 2; // cleanup runs, then effect re-runs with new subscription
 * dispose(); // final cleanup runs
 */
export declare function effect(fn: () => void | (() => void)): () => void;
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