export type V2IdempotencyStatus = "received" | "queued" | "accepted" | "committed" | "unknown_delivery";
export type V2ChannelState = {
    readonly senderRef: string;
    readonly channelId: string;
    readonly ready: true;
    readonly lastSeen: number;
};
export type V2IdempotencyRequest = {
    senderRef: string;
    clientRequestId: string;
    payload: unknown;
};
export type V2IdempotencyRecord = {
    readonly key: string;
    readonly generation: string;
    readonly senderRef: string;
    readonly clientRequestId: string;
    readonly fingerprint: string;
    status: V2IdempotencyStatus;
    messageId?: string;
    groupId?: string;
    touchedAt: number;
};
type Clock = () => number;
export type V2SessionStateOptions = {
    generation: string;
    maxEntries?: number;
    ttlMs?: number;
    clock?: Clock;
};
type BeginResult = {
    kind: "new";
    record: V2IdempotencyRecord;
} | {
    kind: "replay";
    record: V2IdempotencyRecord;
} | {
    kind: "conflict";
    record: V2IdempotencyRecord;
};
export declare class V2SessionState {
    private generationValue;
    private readonly maxEntries;
    private readonly ttlMs;
    private readonly clock;
    private readonly channels;
    private readonly records;
    constructor(options: V2SessionStateOptions);
    get generation(): string;
    setGeneration(generation: string): void;
    hello(senderRef: string, channelId: string): V2ChannelState;
    touch(senderRef: string, channelId: string): V2ChannelState | undefined;
    get(senderRef: string, channelId: string): V2ChannelState | undefined;
    removeChannel(senderRef: string, channelId: string): void;
    removeOwner(senderRef: string): void;
    begin(request: V2IdempotencyRequest): BeginResult;
    update(key: string, status: V2IdempotencyStatus, details?: {
        messageId?: string;
        groupId?: string;
    }): V2IdempotencyRecord | undefined;
    rememberUnknownDelivery(key: string): V2IdempotencyRecord | undefined;
    getRecord(key: string): V2IdempotencyRecord | undefined;
    forget(key: string): boolean;
    snapshot(): {
        channels: V2ChannelState[];
        records: V2IdempotencyRecord[];
    };
    private prune;
    private pruneCapacity;
    private recordKey;
    private channelKey;
    private assertId;
}
export declare function fingerprintV2Payload(value: unknown): string;
export {};