import type { ChainableHandler } from "./HandlerChainBuilder";
/**
 * Modify a Fetch Request's headers.
 *
 * @param modifyHeaders
 * @returns {@link ChainableHandler}, suitable for use in {@link HandlerChainBuilder.map}
 */
export declare const createHeadersModifyingFetchHandler: <Res>(modifyHeaders: (headers: Headers) => Headers) => ChainableHandler<RequestInfo, Res, RequestInfo, Res, RequestInit | undefined>;
//# sourceMappingURL=headersModifyingFetchHandler.d.ts.map