import { z } from "zod/v4";
export type FsDuplexParty = "initiator" | "handler";
/**
 * The Zod schema for a raw message on the wire.
 * It validates the core fields of the protocol frame.
 * The 'payload' is treated as `any` here and will be typed by consuming code.
 */
export declare const zFsDuplexMessage: z.ZodObject<{
    from: z.ZodEnum<{
        initiator: "initiator";
        handler: "handler";
    }>;
    seq: z.ZodNumber;
    ack: z.ZodNumber;
    type: z.ZodString;
    payload: z.ZodOptional<z.ZodAny>;
}, z.core.$strip>;
export type FsDuplexMessage = z.infer<typeof zFsDuplexMessage>;
/**
 * Defines the payloads for all possible message types in the fs-duplex protocol.
 * The generic type <T> represents the application-specific data being transported.
 */
export type FsDuplexPayloads<T> = {
    init: {
        initial_payload?: T;
    };
    ack: null;
    fin: {
        reason: "done" | "error" | "timeout";
    };
    fin_ack: null;
    ping: null;
    pong: null;
    data: T;
};
/**
 * The union of all possible message types.
 */
export type FsDuplexMessageType = keyof FsDuplexPayloads<any>;
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