export interface SessionAffinityIdentity {
    deployment: string;
    webId: string;
    conversationId: string;
    provider: string;
}
export interface SessionAffinityEntry extends SessionAffinityIdentity {
    credentialId: string;
    expiresAt?: Date;
}
export interface CredentialCooldownIdentity {
    deployment: string;
    webId: string;
    credentialId: string;
}
export interface SessionAffinityStore {
    affinityKey(input: SessionAffinityIdentity): string;
    cooldownKey(input: CredentialCooldownIdentity): string;
    get(input: SessionAffinityIdentity): Promise<SessionAffinityEntry | undefined>;
    set(input: SessionAffinityEntry): Promise<void>;
    delete(input: SessionAffinityIdentity): Promise<void>;
    getCooldown(input: CredentialCooldownIdentity): Promise<Date | undefined>;
    setCooldown(input: CredentialCooldownIdentity & {
        until: Date;
    }): Promise<void>;
}
export interface SessionAffinityKeyDeriver {
    hashWebId(webId: string): string;
    hashConversationId(conversationId: string): string;
    hashCredentialId(credentialId: string): string;
}
export interface HmacSessionAffinityKeyDeriverOptions {
    secret: string | Uint8Array;
}
export declare class HmacSessionAffinityKeyDeriver implements SessionAffinityKeyDeriver {
    private readonly secret;
    constructor(options: HmacSessionAffinityKeyDeriverOptions);
    hashWebId(webId: string): string;
    hashConversationId(conversationId: string): string;
    hashCredentialId(credentialId: string): string;
    private hmac;
}
export declare function createSessionAffinityKeyDeriver(input: {
    secret?: string | Uint8Array;
    keyDeriver?: SessionAffinityKeyDeriver;
}): SessionAffinityKeyDeriver;
export declare function affinityStorageKey(input: SessionAffinityIdentity, keyDeriver: SessionAffinityKeyDeriver): string;
export declare function cooldownStorageKey(input: CredentialCooldownIdentity, keyDeriver: SessionAffinityKeyDeriver): string;
export declare function isExpired(date: Date | undefined, now: Date): boolean;