/** Prefix stamped on every eve session stream event id. */
export declare const EVENT_ID_PREFIX = "evt_";
/**
 * Mints the id carried on one session stream event's `meta.id`:
 * {@link EVENT_ID_PREFIX} followed by a ULID.
 *
 * See `#shared/ulid.js` for the ordering guarantee — it holds within a
 * process, not across the separate steps of one session.
 */
export declare function createEventId(): string;
/**
 * Returns true when `value` has the shape {@link createEventId} produces.
 *
 * Shape-only: this does not prove eve minted the id.
 */
export declare function isEventId(value: string): boolean;