/**
 * Wraps an async function `fn` that fetches data from an API and returns a Promise.
 * If `fn` succeeds, its result is returned. If it fails, a custom error with the message
 * 'Promise rejected' is thrown.
 *
 * @template T - The type of the Promise returned by `fn`.
 * @param {() => Promise<T>} fn - The async function that fetches data from an API to wrap.
 * @returns {Promise<T>} - Resolves with `fn`'s result or rejects with
 *                         'Promise rejected' if `fn` fails.
 * @throws {Error} - Throws 'Promise rejected' on failure.
 */
export declare function fetchWrapper<T>(fn: () => Promise<T>): Promise<T>;
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