/** Group Text Protocol client wrapper. */
import { PayloadCodec } from "./native";
import { MlsContext } from "./mls";
import { GroupNode, OutboundFrame } from "./node";
export { PayloadCodec };
/** Outcome of {@link GtpClient.accept}. */
export interface GtpAcceptResult {
    status: "new" | "duplicate" | "error" | string;
    sender?: number;
    messageId?: bigint;
    text?: string;
    reason?: string;
}
/**
 * Group Text Protocol client.
 *
 * Tracks idempotency by ``(sender_id, message_id)``.
 */
export declare class GtpClient {
    /** Native handle (i32). */
    handle: number;
    private constructor();
    /** Create a fresh GTP client. */
    static create(): GtpClient;
    /**
     * Send a text message.
     * @param codec - payload encoding (default: CBOR).
     */
    send(node: GroupNode, mls: MlsContext, target: number, messageId: bigint, text: string, codec?: PayloadCodec): OutboundFrame;
    /**
     * Accept a plaintext payload delivered by the GBP layer.
     * `currentEpoch` lets the client auto-reset its idempotency state
     * when the epoch advances. `codec` must match the `codec` field of the
     * `payload_received` event.
     */
    accept(plaintext: Buffer, currentEpoch: bigint | number, codec?: PayloadCodec): GtpAcceptResult;
    /** Clear the idempotency state. Intended for use after an epoch change. */
    reset(): void;
    /** Release the native handle. Idempotent. */
    close(): void;
    [Symbol.dispose](): void;
}
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