export type TransportEventKind = "responses-fallback-endpoint" | "responses-fallback-shape" | "responses-fallback-error" | "responses-fallback-reasoning" | "responses-downgrade-extras" | "responses-eof-accepted";
export interface TransportEvent {
    readonly kind: TransportEventKind;
    readonly provider: string;
    readonly model: string;
    readonly detail?: string | undefined;
}
type TransportListener = (event: TransportEvent) => void;
export declare function onTransportEvent(listener: TransportListener): () => void;
export declare function emitTransportEvent(event: TransportEvent): void;
export declare function resetTransportEventsForTesting(): void;
export {};