import * as sqlite from 'sql.js';
export interface EncryptedDataItem {
    salt: Uint8Array;
    iv: Uint8Array;
    data: Uint8Array;
}
export declare namespace sqljsPersistence {
    function save(dbName: string, key: CryptoKey, db: Pick<sqlite.Database, 'export'>): Promise<void>;
    function load(dbName: string, passPhrase: string, sqlJsStatic: sqlite.SqlJsStatic): Promise<{
        database: sqlite.Database;
        key: CryptoKey;
    }>;
}
export declare namespace sqljsHelpers {
    function query<T>(db: Pick<sqlite.Database, 'exec'>, sql: string, params?: any[]): T[];
    function exec(db: Pick<sqlite.Database, 'exec'>, sql: string, params?: any[]): sqlite.QueryExecResult[];
    function run(db: Pick<sqlite.Database, 'run'>, sql: string, params?: any[]): void;
    function isTable(db: Pick<sqlite.Database, 'exec'>, table: string): boolean;
    function sanitizeParams(params: any[]): sqlite.SqlValue[];
}
export declare namespace cryptoHelpers {
    function getKey(passphrase: string, salt?: Uint8Array): Promise<{
        key: CryptoKey;
        salt: Uint8Array;
    }>;
    function encrypt(key: CryptoKey, salt: Uint8Array, data: Uint8Array): Promise<EncryptedDataItem>;
    function decrypt(key: CryptoKey, iv: BufferSource, encryptedData: BufferSource): Promise<ArrayBuffer>;
}
export declare namespace flushHelpers {
    function createAsyncFlushQueue(saveFn: () => Promise<void>): () => void;
}