interface GuardEventTarget {
    addEventListener(type: string, listener: (event: unknown) => void): void;
    removeEventListener(type: string, listener: (event: unknown) => void): void;
}
interface GuardLogger {
    error(message: string, context?: Record<string, unknown>): void;
}
export interface UnhandledRejectionGuardOptions {
    /** Defaults to the global process event target. */
    target?: GuardEventTarget;
    /** Defaults to the server logger. */
    logger?: GuardLogger;
}
export interface UnhandledRejectionGuardHandle {
    /**
     * True while this handle holds a lease on an active guard. False only when the
     * target cannot receive listeners at all.
     */
    readonly installed: boolean;
    /**
     * Rejections contained on this target so far, across every holder. This is a
     * process-level metric: export it and alert on its rate.
     */
    getRejectionCount(): number;
    /**
     * Release this handle's lease. The listener is removed once the last holder
     * releases it. Safe to call more than once.
     */
    dispose(): void;
}
/**
 * Install the process-wide guard.
 *
 * Returns a handle whose `installed` is false when the target already has an
 * owner or cannot receive listeners.
 */
export declare function installUnhandledRejectionGuard(options?: UnhandledRejectionGuardOptions): UnhandledRejectionGuardHandle;
export {};
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