import type { AppRequestHeaders } from "./types.js";
/** Sync locale/timezone into the CURRENT scope for HTTP clients (via `getAppRequestHeaders`). */
export declare function syncAppRequestHeaders(headers: Partial<AppRequestHeaders>): void;
/** Read the current scope's preference headers — wire to API client `setAppHeaderProvider`. */
export declare function getAppRequestHeaders(): AppRequestHeaders;
/** Reset the current scope's headers to defaults — for tests only. */
export declare function resetAppRequestHeaders(): void;