import type { Accessor, ObserverCallback, ReadableSignal } from './internals/types.js';
import { effect, effectScope, deferScope } from './internals/system.js';
export { effect, effectScope, deferScope };
/**
 * Subscribe to accessor changes.
 * Callback will be called immediately.
 * Will trigger accessor mount if applicable.
 * @param $accessor - The accessor to subscribe to.
 * @param fn - The callback to call on value change.
 * @param noDefer - Ignore subscription defer.
 * @returns A function to stop the subscription.
 */
export declare function subscribe<T>($accessor: Accessor<T>, fn: ObserverCallback<T>, noDefer?: boolean): import("./internals/types.js").Destroy;
/**
 * Listen accessor changes.
 * Callback will be called only on value change, without initial call.
 * Will trigger accessor mount if applicable.
 * @param $accessor - The accessor to subscribe to.
 * @param fn - The callback to call on value change.
 * @param noDefer - Ignore subscription defer.
 * @returns A function to stop the subscription.
 */
export declare function listen<T>($accessor: Accessor<T>, fn: ObserverCallback<T>, noDefer?: boolean): import("./internals/types.js").Destroy;
/**
 * Observe accessor changes.
 * Callback will be called only on value change, without initial call.
 * Will not trigger accessor mount.
 * @param $accessor - The accessor to subscribe to.
 * @param fn - The callback to call on value change.
 * @param noDefer - Ignore subscription defer.
 * @returns A function to stop the subscription.
 */
export declare function observe<T>($accessor: ReadableSignal<T>, fn: ObserverCallback<T>, noDefer?: boolean): import("./internals/types.js").Destroy;
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