export type AdapterResponse = {
    result?: string | object;
    time?: number;
    error?: Error;
};
export declare enum DataAdapterKey {
    Rulesets = "statsig.cache",
    IDLists = "statsig.id_lists"
}
/**
 * An adapter for implementing custom storage of config specs.
 * Useful for backing up data in memory.
 * Can also be used to bootstrap Statsig server.
 */
export interface IDataAdapter {
    /**
     * Returns the data stored for a specific key
     * @param key - Key of stored item to fetch
     */
    get(key: string): Promise<AdapterResponse>;
    /**
     * Updates data stored for each key
     * @param key - Key of stored item to update
     * @param value - New value to store
     * @param time - Time of update
     */
    set(key: string, value: string, time?: number): Promise<void>;
    /**
     * Startup tasks to run before any fetch/update calls can be made
     */
    initialize(): Promise<void>;
    /**
     * Cleanup tasks to run when statsig is shutdown
     */
    shutdown(): Promise<void>;
    /**
     * Determines whether the SDK should poll for updates from
     * the data adapter for the given key
     * @param key - Key of stored item to poll from data adapter
     */
    supportsPollingUpdatesFor?(key: DataAdapterKey): boolean;
}