import { Middleware } from "koa";
import { BaseDocument } from "../database/base.type";
import { DataModel } from "../database/mongodb";
export interface Session<SessionObject> {
    session: SessionObject;
}
export declare abstract class SessionDatabase<SessionObject> extends DataModel<SessionObject & BaseDocument> {
    get(sessid: string): Promise<SessionObject>;
    set(sessid: string, $update: UpdateOperator<SessionObject>): Promise<void>;
    init(session: Partial<SessionObject>): Promise<string>;
    destroy(sessid: string): Promise<void>;
}
export declare type UpdateOperator<SessionObject> = {
    $set?: Partial<SessionObject>;
    $unset?: Record<keyof SessionObject, number>;
};
export interface SessionOptions {
    cookieName?: string;
    timeoutMs?: number;
}
export declare function kMongooseSession<SessionObject extends object>(db: SessionDatabase<SessionObject>, options?: SessionOptions): Middleware;