/**
 * Minimal polyfills for the standard `Request` and `Response` classes.
 *
 * Jest 27's test environments (both `jsdom` and `node`) do not forward the
 * fetch-API globals that Node 18+ provides.  These polyfills are installed
 * on `globalThis` during `setUp()` so that both the tester's own code and
 * user test code can use `new Request()` / `new Response()`.
 */
/**
 * Installs `Response` and `Request` on `globalThis` when they are missing.
 * Call from `setUp()`.
 */
export declare function installFetchPolyfills(): void;
/**
 * Removes only the polyfills that `installFetchPolyfills` added.
 * Call from `tearDown()`.
 */
export declare function uninstallFetchPolyfills(): void;
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