import { Context, Effect } from 'effect';
/**
 * Generates the `_u` meta field: a monotonic ULID.
 *
 * The factory state is module-scoped, so same-millisecond calls within an
 * isolate produce strictly ascending IDs — even where the clock is frozen
 * during synchronous execution (e.g. Cloudflare Workers). Override in tests
 * via `Effect.provideService(Ulid, () => ...)` for deterministic IDs.
 */
export declare const Ulid: Context.Reference<() => string>;
/** Yields a fresh monotonic ULID from the {@link Ulid} generator. */
export declare const nextUlid: Effect.Effect<string>;
/**
 * Extracts the millisecond timestamp from a `_u` value, format-agnostic:
 * a ULID yields its embedded time, an ISO-8601 string yields its parse time
 * (for backends that stamp `_u` with timestamps instead of ULIDs), and any
 * other value yields `null`.
 */
export declare const uTime: (u: string) => number | null;
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