import type { TimelineItem } from "../../timeline/index.js";
/**
 * Whether the rendered timeline already shows this exact session failure, so
 * the failed-session banner need not repeat its headline and Details.
 * Presentation only: retry, billing and sandbox recovery keep their owners.
 *
 * The proof is item identity, never wording: the failure event's own notice,
 * or a failed compaction landmark with diagnostics from the same attempt as the
 * failure's own turn end. Retry reopens the same logical turn, so a landmark
 * before that turn's previous settlement belongs to an older failure. A
 * cleared or paged view that omits the failure proves nothing.
 */
export declare function timelineShowsFailure(items: readonly TimelineItem[], failure: {
    failureEventId?: string | null | undefined;
    turnId?: string | null | undefined;
}): boolean;