import type { Session, SessionDiff } from '../../types/index.js';
/**
 * Compare two sessions and return what changed.
 * `older` is the previous session, `newer` is the current one.
 */
export declare function diffSessions(older: Session, newer: Session): SessionDiff;
/**
 * Format a session diff as a human-readable summary string.
 */
export declare function formatDiffSummary(diff: SessionDiff): string;
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