/**
 * React hook that asks the PieUI backend whether a named feature/component is
 * supported for the current user, and returns the boolean answer.
 *
 * The hook maintains two module-level caches:
 * - `resultCache` stores resolved answers for the rest of the session, so
 *   only the first caller actually hits the network;
 * - `inflightCache` deduplicates concurrent requests for the same
 *   `(apiServer, name)` pair, so multiple components mounting in the same
 *   tick share one fetch.
 *
 * While the answer is being fetched the hook returns `null`, which callers
 * can use to show a neutral/loading state.
 *
 * @param apiServer Base URL of the PieUI API server.
 * @param name      Feature/component identifier passed as `api/support/{name}`.
 * @returns `true`/`false` once known, or `null` while loading.
 */
export declare function useIsSupported(apiServer: string, name: string): boolean | null;
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