import { StoredAttempt, Attempt } from "../data/Attempt";
import { SessionMetadata, StoredSessionMetadata } from "../data/SessionMetadata";
import { SessionUUID } from "../UUID";
export declare type SyncChangeListener = (attempt: StoredAttempt[]) => void;
export declare interface Storage {
    connectRemoteDB(username: string, password: string): void;
    createSession(sessionMetadata: SessionMetadata): Promise<StoredSessionMetadata>;
    getAllSessions(): Promise<StoredSessionMetadata[]>;
    addNewAttempt(attempt: Attempt): Promise<StoredAttempt>;
    updateAttempt(storedAttempt: StoredAttempt): Promise<void>;
    deleteAttempt(storedAttempt: StoredAttempt): Promise<void>;
    latestAttempts(sessionID: SessionUUID, n: number): Promise<StoredAttempt[]>;
    sessionNumAttempts(sessionID: SessionUUID): Promise<number>;
    addListener(listener: SyncChangeListener): void;
    removeListener(listener: SyncChangeListener): void;
}
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