import MutablePromise from "mutable-promise";
export interface IStorage<T> {
    storageType: string;
    setItem(key: string, value: T): void;
    getItem(key: string): T | null;
    removeItem(key: string): void;
    itemExists(key: string): boolean;
    keys(): IterableIterator<string>;
    reload(key: string): Promise<T | null>;
    waitForCommit(): Promise<void>;
}
export type SyncIDBStorageOptions = {
    lazy?: 0 | 1 | 2;
};
export declare class SyncIDBStorage<T> implements IStorage<T> {
    asyncStorage: AsyncIDBStorage<T>;
    channelName: string;
    storageType: string;
    memoryCache: Record<string, T>;
    loadedAll: boolean;
    loadingPromise?: Promise<void>;
    passiveLoadingPromise: MutablePromise<unknown>;
    getLoadingPromise(passive?: boolean): MutablePromise<unknown> | Promise<void>;
    static create<T>(dbName: string, initialData: Record<string, T>, opt?: SyncIDBStorageOptions): Promise<SyncIDBStorage<T>>;
    ensureLoaded(): void;
    constructor(asyncStorage: AsyncIDBStorage<T>, channelName: string);
    getItem(key: string): T | null;
    setItem(key: string, value: T): void;
    removeItem(key: string): void;
    itemExists(key: string): boolean;
    keys(): IterableIterator<string>;
    reload(key: string): Promise<T | null>;
    waitForCommit(): Promise<void>;
}
export declare function idbReqPromise<T>(request: IDBRequest<T>): Promise<T>;
export declare class AsyncIDBStorage<T> {
    dbName: string;
    initialData: Record<string, T>;
    private db;
    uncommitedCounter: UncommitCounter;
    constructor(dbName: string | undefined, initialData: Record<string, T>);
    initDB(s: SyncIDBStorage<T>): Promise<void>;
    loadAllData(s: SyncIDBStorage<T>): Promise<void>;
    getItem(key: string): Promise<T | null>;
    setItem(key: string, value: T): Promise<void>;
    removeItem(key: string): Promise<void>;
    waitForCommit(): Promise<void>;
}
declare class UncommitCounter {
    private value;
    private promise;
    inc(): void;
    dec(): void;
    wait(): Promise<void>;
}
export {};