/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 */
import { Draft } from 'immer';
import { Persistable } from '../plugin/PluginBase';
export interface ReadOnlyAtom<T> {
    get(): T;
    subscribe(listener: (value: T, prevValue: T) => void): () => void;
    unsubscribe(listener: (value: T, prevValue: T) => void): void;
}
export interface Atom<T> extends ReadOnlyAtom<T> {
    set(newValue: T): void;
    update(recipe: (draft: Draft<T>) => void): void;
    update<X extends T>(recipe: (draft: X) => void): void;
}
export declare class AtomValue<T> implements Atom<T>, Persistable {
    value: T;
    listeners: ((value: T, prevValue: T) => void)[];
    constructor(initialValue: T);
    get(): T;
    set(nextValue: T): void;
    deserialize(value: T): void;
    serialize(): any;
    update(recipe: (draft: Draft<T>) => void): void;
    notifyChanged(prevValue: T): void;
    subscribe(listener: (value: T, prevValue: T) => void): () => void;
    unsubscribe(listener: (value: T, prevValue: T) => void): void;
}
type StateOptions = {
    /**
     * Should this state persist when exporting a plugin?
     * If set, the atom will be saved / loaded under the key provided
     */
    persist?: string;
    /**
     * Store this state in local storage, instead of as part of the plugin import / export.
     * State stored in local storage is shared between the same plugin
     * across multiple clients/ devices, but not actively synced.
     */
    persistToLocalStorage?: boolean;
};
export declare function createState<T>(initialValue: T, options?: StateOptions): Atom<T>;
export declare function createState<T>(): Atom<T | undefined>;
export interface AtomPersistentStorage {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
}
export declare function _setAtomPersistentStorage(newStorage: AtomPersistentStorage): void;
export declare function isAtom(value: any): value is Atom<any>;
export {};
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