/**
 * useStream — progressive text (LLM-token-style). Returns a string signal
 * that accumulates the source's chunks.
 *
 * - Server, streaming: tokens append into the page as they arrive; the
 *   final text swaps in and is serialized under `key`.
 * - Server, blocking: drained fully, final text inline.
 * - Client, hydrating: final text restored from `key` — the source is NOT
 *   re-run (no duplicate LLM calls).
 * - Client, navigation: runs live; the signal updates per chunk.
 *
 * This module provides the default CLIENT semantics. Server renderers
 * install a per-instance provider (`_useStream` on the setup context) that
 * takes over during SSR.
 */
export declare function useStream(key: string, source: () => AsyncIterable<string>): {
    readonly value: string;
};
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