import * as Nostr from "nostr-typedef";
export declare function ensureEventFields(event: Partial<Nostr.Event>): event is Nostr.Event;
/** Return an event that has earlier `created_at`. */
export declare function earlierEvent(a: Nostr.Event, b: Nostr.Event): Nostr.Event;
/** Return an event that has later `created_at`. */
export declare function laterEvent(a: Nostr.Event, b: Nostr.Event): Nostr.Event;
/** Sort key function to sort events based on `created_at`. */
export declare function compareEvents(a: Nostr.Event, b: Nostr.Event): number;
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