export declare class MetalEgressObservationError extends Error {
}
/** Incremental bounded multipart decoder, independently testable without a socket or privileges. */
export declare class MetalEgressDump {
    private readonly sequence;
    private readonly portId;
    private readonly ifIndex;
    private bytes;
    private datagrams;
    private messages;
    private done;
    private policies;
    constructor(sequence: number, portId: number, ifIndex: number);
    get complete(): boolean;
    accept(bytes: Uint8Array, senderPid: number): void;
    result(): {
        burstMbps: number;
        digest: string;
    };
}
/** The only message this module can send is a fixed RTM_GETTFILTER dump for one interface. */
export declare function metalEgressDumpRequest(ifIndex: number, sequence: number): Uint8Array;
/** Local socket seam for fault testing, never exposed through the helper request.
 * The send operation always receives the fixed read-only GET request above. */
export interface MetalEgressKernelSocket {
    portId: number;
    send(request: Uint8Array): void;
    receive(): {
        bytes: Uint8Array;
        senderPid: number;
    };
    close(): void;
}
export declare function readMetalEgressSocket(ifIndex: number, sequence: number, socket: MetalEgressKernelSocket, now?: () => number): {
    burstMbps: number;
    digest: string;
};
/** Linux/x64 only, fixed trusted libc path, bounded kernel replies, all handles closed on every outcome. */
export declare function observeMetalEgress(ifIndex: number): Promise<{
    burstMbps: number;
    digest: string;
}>;