import ITokensDatabase from './ITokensDatabase';
import IEngine from './IEngine';
import ChannelId from '../ChannelId';
export default abstract class AbstractTokensDatabase<T extends IEngine> implements ITokensDatabase {
    kind: string;
    engine: T;
    constructor(engine: T, namespace: string | null);
    abstract save(token: string, channelId: ChannelId | string): Promise<void>;
    abstract isPresent(token: string): Promise<boolean>;
}