import { CardEnvelope, CardContext, CardEvent } from '../primitives/card-contract';
export declare const CARD_WIRE_PROTOCOL: "kitn-card";
export interface WireFrame<M extends WireMessage = WireMessage> {
    protocol: typeof CARD_WIRE_PROTOCOL;
    /** The NEGOTIATED contract version (set by the per-bridge packer). */
    version: string;
    /** Per-bridge instance nonce (host-minted, echoed on every up-frame). */
    nonce: string;
    message: M;
}
export type DownMessage = {
    dir: 'down';
    kind: 'hello';
    supportedVersions: string[];
} | {
    dir: 'down';
    kind: 'render';
    envelope: CardEnvelope;
} | {
    dir: 'down';
    kind: 'context';
    context: CardContext;
} | {
    dir: 'down';
    kind: 'teardown';
};
export type UpMessage = {
    dir: 'up';
    kind: 'ready';
    acceptedVersion: string;
    capabilities?: {
        types?: string[];
    };
} | {
    dir: 'up';
    kind: 'event';
    event: CardEvent;
} | {
    dir: 'up';
    kind: 'focus-edge';
    edge: 'start' | 'end';
} | {
    dir: 'up';
    kind: 'fault';
    code: WireFaultCode;
    message: string;
};
export type WireFaultCode = 'version-unsupported' | 'bad-frame' | 'render-failed' | 'origin-rejected';
export type WireMessage = DownMessage | UpMessage;
export declare function createPacker(version: string, nonce: string): <M extends WireMessage>(message: M) => WireFrame<M>;
/** Structural + direction guard. Host calls with 'up', runtime with 'down'.
 *  STRUCTURAL only — nonce/version equality + schema validation happen after. */
export declare function isCardWireFrame(data: unknown, expectedDir: 'up' | 'down'): data is WireFrame;