/**
 * NATS chunk → normalized `ChatStreamEvent` decoder.
 *
 * THE live NATS reading path — the ONLY chunk parser in the codebase. Every
 * consumer (this lib's `useNatsChatAdapter`, the hub, the product app) feeds
 * raw chunks through `decodeNatsChunk` into `createChatStreamReducer`. The
 * legacy `components/chat/utils/chunk-parser.ts` (`parseChunkToAction`) that
 * this module superseded was DELETED — do not reintroduce a second decoder.
 *
 * Chunks map onto the transport-agnostic event union, with the JetStream
 * `streamSeq` lifted into the `seq` envelope (the reducer's idempotency gate
 * keys off it).
 *
 * Behavior is pinned by `__tests__/nats-decoder-golden.test.ts`.
 *
 * Server-safe: no React, no browser APIs.
 */
import type { AskOptionData } from '../components/chat/types/message.types';
import type { ChatStreamEvent } from './events';
/** Coerce the wire's ask `options[]` into the card's row shape. Rows without a
 *  usable `label` are dropped: the label is what gets SENT when the row is
 *  picked, so a blank one would post an empty reply. */
export declare function normalizeAskOptions(raw: unknown): AskOptionData[];
/**
 * Parse one raw NATS chunk into a normalized event. Returns `null` for
 * unknown/malformed chunks — an unrecognized `type`, a missing required
 * field, or a non-object payload are all tolerated as no-ops rather than
 * throwing, so a backend that adds a chunk type can't break the stream.
 */
export declare function decodeNatsChunk(chunk: unknown): ChatStreamEvent | null;
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