/**
 * Register a per-request {@link SignalScope} for server `reactive()` / `task()` / `relay()` using
 * React's `cache` (same lifetime as other per-request memoization in RSC / Flight).
 *
 * Call **once** per server bundle before any server-side reactive work (e.g. top of root layout or
 * `instrumentation.ts`). Safe to call multiple times; the last registration wins.
 *
 * Requires **React 19+** (`React.cache`). Does not run in the browser: import this module only from
 * server code paths.
 */
export declare function setupRscRequestScope(): void;
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