import { ReactiveLayer } from "./reactive-primitive-types";
/**
 * Provides the fundamental reactive layer for fluidstate.
 * This function must be called once before any other fluidstate reactive
 * functionalities are used.
 *
 * @param layer - An object conforming to the ReactiveLayer interface,
 *                which will be used for all underlying reactive operations.
 * @throws Error if the reactive layer has already been provided.
 */
export declare const provideReactiveLayer: (layer: ReactiveLayer) => void;
/**
 * Unsafely replaces the existing reactive layer with a new one. There
 * are predictable and unpredictable consequences of doing this. One of the
 * issues will be that past reactions cannot observe new reactive objects
 * and vice versa.
 *
 * @param layer - An object conforming to the ReactiveLayer interface,
 *                which will be used for all underlying reactive operations, or
 *                `null` in order to unset the layer.
 */
export declare const unsafeReplaceReactiveLayer: (layer: ReactiveLayer | null) => void;
/**
 * Retrieves the fundamental reactive layer that was previously set
 * via `provideReactiveLayer`.
 *
 * This function is primarily for internal use within fluidstate or by
 * extensions that need direct access to the underlying reactive primitives.
 *
 * @returns The reactive layer instance.
 * @throws Error if `provideReactiveLayer` has not been called yet.
 */
export declare const getReactiveLayer: () => ReactiveLayer;
/**
 * @returns The fundamental reactive layer that was previously set via
 *          `provideReactiveLayer` or `null` if it was not provided.
 */
export declare const getCurrentReactiveLayer: () => ReactiveLayer | null;