/** Describes a single cache-flush event detected in the JSONL stream. */
export interface FlushEvent {
    /** 0-based turn index within the assistant entries. */
    turn: number;
    /** 1-based line number in the original JSONL file (empty lines included in count). */
    line: number;
    /** ISO timestamp string from the JSONL entry, or null if absent. */
    timestamp: string | null;
}
/**
 * Re-parse a Claude Code session JSONL file and return one {@link FlushEvent}
 * per detected cache flush, preserving the **1-based line number** from the
 * original file and the entry's `timestamp` field when present.
 *
 * Flush detection heuristic (identical to `summariseCacheHealth`):
 *   `turn_index > 0 && cache_creation > FLUSH_CREATION_THRESHOLD && cache_read < FLUSH_READ_THRESHOLD`
 *
 * Line numbers are 1-based and count all lines (including empty and malformed),
 * so they can be used to locate the entry in the raw file.
 *
 * Non-assistant entries and malformed JSON lines are skipped (same semantics as
 * `readSessionJsonl`), but they still increment the line counter.
 */
export declare function extractFlushTurns(filePath: string): FlushEvent[];