/**
 * UUIDv7 generator — RFC 9562 §5.7.
 *
 * QAR uses UUIDv7 for `message_id` so envelopes sort lexicographically by emit
 * time. The wire format is the standard 8-4-4-4-12 hex grouping; bits laid out
 * as: 48-bit Unix timestamp (ms) · 4-bit version · 12-bit rand_a · 2-bit
 * variant · 62-bit rand_b. The random portions are pulled from
 * `globalThis.crypto.getRandomValues` (Node 19+ and every modern browser) so
 * the output is suitable for protocol use, not just `Math.random`. The
 * isomorphic source matters: `@qodo/sdk` ships a browser WS adapter, and a
 * module-scope `node:crypto` import would break browser bundling.
 *
 * Returned as `string`; cast at the boundary with `asMessageId` / `asSessionId`
 * when you need a branded id.
 */
import type { MessageId, SessionId, TaskId } from '../qar/ids.js';
/** Generate a fresh UUIDv7. */
export declare function uuidv7(): string;
/** Brand-cast a string id as `MessageId`. */
export declare function asMessageId(id: string): MessageId;
/** Brand-cast a string id as `SessionId`. */
export declare function asSessionId(id: string): SessionId;
/**
 * Brand-cast a string id as `TaskId`.
 *
 * Used by `TaskClient.tasks.start` to derive the `task_id` synchronously from
 * the outbound `task.start.message_id`. The wire contract codifies
 * `task_id == task.start.message_id`, so the SDK doesn't need to wait
 * for the first inbound envelope to know the id.
 */
export declare function asTaskId(id: string): TaskId;
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