import { VerifiedEvent, UnsignedEvent } from "nostr-tools";
import { SessionState, Unsubscribe, EventCallback, Rumor } from "./types";
/**
 * Double ratchet secure communication session over Nostr
 *
 * Very similar to Signal's "Double Ratchet with header encryption"
 * https://signal.org/docs/specifications/doubleratchet/
 */
export declare class Session {
    state: SessionState;
    private internalSubscriptions;
    private currentInternalSubscriptionId;
    name: string;
    constructor(state: SessionState);
    /**
     * Initializes a new secure communication session
     * @param theirEphemeralNostrPublicKey The ephemeral public key of the other party for the initial handshake
     * @param ourEphemeralNostrPrivateKey Our ephemeral private key for the initial handshake
     * @param isInitiator Whether we are initiating the conversation (true) or responding (false)
     * @param sharedSecret Initial shared secret for securing the first message chain
     * @param name Optional name for the session (for debugging)
     * @returns A new Session instance
     */
    static init(theirEphemeralNostrPublicKey: string, ourEphemeralNostrPrivateKey: Uint8Array, isInitiator: boolean, sharedSecret: Uint8Array, name?: string): Session;
    /**
     * Send a partial Nostr event through the encrypted session.
     * Message builders are responsible for chat-specific kinds, tags, and expiration policy.
     * @param event Partial inner event to send. Must be unsigned. Id will be generated if not provided.
     * @returns A verified Nostr event containing the encrypted message. You need to publish this event to the Nostr network.
     * @throws Error if we are not the initiator and trying to send the first message
     */
    sendEvent(event: Partial<UnsignedEvent>): {
        event: VerifiedEvent;
        innerEvent: Rumor;
    };
    /**
     * Subscribe to rumors decrypted by receiveEvent().
     * @param callback Function to be called when a message is received
     * @returns Unsubscribe function to stop receiving messages
     */
    onEvent(callback: EventCallback): Unsubscribe;
    /**
     * Stop local receiveEvent() callbacks.
     */
    close(): void;
    private ratchetEncrypt;
    private ratchetDecrypt;
    private ratchetStep;
    private skipMessageKeys;
    private trySkippedMessageKeys;
    private decryptHeader;
    receiveEvent(e: VerifiedEvent): Rumor | undefined;
}
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