/**
 * In-process signal receipt log (crew#411).
 *
 * Node's `process.on('SIGTERM'/'SIGINT')` callbacks receive no sender pid —
 * there is no SA_SIGINFO equivalent in the JS runtime. The best-effort record
 * is therefore: signal name + epoch-ms timestamp.
 *
 * The log is read by `SeatHealthTracker` when an ACP bridge dies silently
 * (`acpFallback` with `fallbackKind: session_died`) to distinguish:
 *
 *   - "daemon also received SIGTERM at T" → likely a group/terminal signal that
 *     killed both the bridge and the daemon together
 *   - "no daemon signal within ±5s" → a pid-targeted external signal sent
 *     directly to the bridge, or a transport close (neither woke the daemon)
 *
 * The ring is bounded (64 entries) because signals are rare and the entries are
 * tiny; the oldest entry is dropped once the cap is exceeded.
 */
export interface SignalEntry {
    signal: 'SIGTERM' | 'SIGINT';
    at: number;
}
/** Half-width of the default correlation window used by `findInWindow`. */
export declare const SIGNAL_CORRELATION_WINDOW_MS = 5000;
export declare class DaemonSignalLog {
    private readonly _entries;
    private static readonly MAX;
    /**
     * Append a signal receipt. `at` defaults to `Date.now()`; injectable so tests
     * can set exact timestamps without mocking the clock process-wide.
     */
    record(signal: 'SIGTERM' | 'SIGINT', at?: number): void;
    /**
     * Return the closest entry within [`aroundMs` ± `halfWindowMs`], or
     * `undefined` when no entry falls in that interval.
     * `halfWindowMs` defaults to `SIGNAL_CORRELATION_WINDOW_MS` (5 s).
     */
    findInWindow(aroundMs: number, halfWindowMs?: number): SignalEntry | undefined;
    /** All recorded entries, oldest first — a defensive copy, so a caller cannot mutate the ring. */
    entries(): readonly SignalEntry[];
}
/** The daemon-wide singleton. The CLI records into it; the seat-health tracker reads from it. */
export declare const daemonSignalLog: DaemonSignalLog;
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