export declare const FIRST_STREAM_EVENT_TIMEOUT_MS = 120000;
export declare const STREAM_TOTAL_TIMEOUT_MS: number;
export interface FirstEventAbortController {
    readonly signal: AbortSignal;
    markFirstEvent: () => void;
    didTimeout: () => boolean;
    timeoutMessage: () => string | undefined;
    cleanup: () => void;
}
export declare function createFirstEventAbortController(parentSignal: AbortSignal): FirstEventAbortController;