export interface AuthFetchOptions {
    /**
     * Return an access token for a request.
     *
     * When `forceRefresh` is true, the previous token was rejected with a 401
     * and the provider should refresh it before returning. Providers own token
     * storage and refresh-token rotation.
     */
    getAccessToken: (options: {
        forceRefresh: boolean;
    }) => string | Promise<string>;
    /** Fetch implementation used to send requests. Defaults to global fetch. */
    fetch?: typeof fetch;
    /** Called when the request is still unauthorized after one refresh. */
    onUnauthorized?: (response: Response) => void | Promise<void>;
}
/**
 * Create a fetch implementation that supplies a bearer token and refreshes it
 * after a 401 response.
 *
 * Refresh calls are coalesced so concurrent unauthorized requests rotate a
 * refresh token only once. Each request is retried at most once.
 *
 * @param options - Authentication behavior for the fetch implementation.
 * @param options.getAccessToken - Returns the current token or refreshes it.
 * @param options.fetch - Fetch implementation used to send requests.
 * @param options.onUnauthorized - Handles a second unauthorized response.
 */
export declare function createAuthFetch({ getAccessToken, fetch: fetchImpl, onUnauthorized, }: AuthFetchOptions): typeof fetch;
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