/** Minimal sink so tests can capture without touching the real logger. */
export interface RejectionLogSink {
    error(msg: string): void;
}
/**
 * Render a rejection reason for the log.
 *
 * Prefers the stack: without it an `unhandledRejection` report is close to
 * useless, because the throw site is exactly what the caller failed to observe.
 * Non-Error reasons (a rejected string, a plain object) still have to produce
 * something readable, since `String({})` alone would log "[object Object]".
 */
export declare function formatRejectionReason(reason: unknown): string;
/**
 * The handler body, exported so a test can drive it directly instead of
 * emitting a real process-level event (which would leak across test files).
 *
 * Returns whether the rejection was logged; a broken-pipe-class reason is
 * dropped for the same reason stdio-epipe-guard drops it, and reporting that
 * would just add noise on every detached pm2 log stream.
 */
export declare function handleDaemonUnhandledRejection(reason: unknown, sink: RejectionLogSink): boolean;
/**
 * Install the daemon-side guard. Idempotent, so multiple entry points may call
 * it. Returns true if it installed on this call.
 *
 * `target` is parameterized only so unit tests can inject a fake emitter rather
 * than registering a listener on the real process for the whole test run.
 */
export declare function installDaemonRejectionGuard(sink: RejectionLogSink, target?: {
    on(event: 'unhandledRejection', cb: (reason: unknown) => void): unknown;
}): boolean;
/** Test-only reset of the idempotency latch. */
export declare function resetDaemonRejectionGuardForTest(): void;
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