export interface SyncStore<T> {
    subscribe: SyncStoreSubscribe;
    getSnapshot: () => T;
}
export type SyncStoreSubscribe = (callback: () => void) => SyncStoreUnsubscribe;
export type SyncStoreUnsubscribe = () => void;
export declare class FanoutSyncStore<T> implements SyncStore<T> {
    readonly getSnapshot: () => T;
    private readonly fanout;
    readonly subscribe: SyncStoreSubscribe;
    constructor(getSnapshot: () => T);
}
export declare class ValueSyncStore<V> implements SyncStore<V> {
    value: V;
    private readonly fanout;
    readonly subscribe: SyncStoreSubscribe;
    constructor(value: V);
    readonly getSnapshot: () => V;
    next(value: V, force?: boolean): void;
}