import type { Readable } from "svelte/store";
/** Options for {@link useWatch}. Accepted for API parity; stores deliver changes directly. */
export interface UseWatchOptions {
    deep?: boolean;
}
/**
 * Svelte store watcher that invokes `callback` whenever `source` emits a new
 * value. Tracks the previous value so the callback receives `(value, previous)`.
 *
 * Fires once immediately (Svelte stores push their current value to new
 * subscribers) and on every subsequent change. Unsubscribes automatically on
 * component destroy when called during init.
 *
 * @typeParam T - The watched value type.
 * @param source - A readable store to watch.
 * @param callback - Invoked on change as `(value, previous)`.
 * @param options - Accepted for API parity (ignored).
 * @returns The unsubscribe function (for manual teardown outside a component).
 *
 * @example
 * ```svelte
 * <script lang="ts">
 *   import { writable } from "svelte/store";
 *   import { useWatch } from "katanakit-js/adapters/svelte";
 *
 *   const product = writable({ name: "", price: 0 });
 *   useWatch(product, (next, prev) => console.log(next, prev));
 * </script>
 * ```
 */
export declare function useWatch<T>(source: Readable<T>, callback: (value: T, previous: T | undefined) => void, _options?: UseWatchOptions): () => void;
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