/**
 * @license
 * @preserve
 *
 * Copyright 2026 KeeeX SAS
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 */
import * as axios from "axios";
/**
 * Set a header in a list.
 *
 * This takes care of non matching casing.
 */
export declare const setHeaderKey: (headers: Record<string, string>, key: string, value: string) => void;
/** Remove a header, case insensitive */
export declare const removeHeaderKey: (headers: Record<string, string>, key: string) => void;
/** Merge more headers into the first headers list */
export declare const mergeHeaders: (headers: Record<string, string>, moreHeaders: Record<string, string>) => void;
type PrepareHeaderInputFn = (input: Record<string, unknown>, usedKeys: Set<string>) => Record<string, string>;
export declare const getPrepareHeaderInput: (headersParams: Array<string> | Set<string> | undefined) => PrepareHeaderInputFn;
/**
 * Return a header from a response.
 *
 * Only handle string, and only return the first value if the header is present multiple times.
 */
export declare const getResponseHeader: (headers: axios.AxiosResponseHeaders | axios.RawAxiosResponseHeaders, headerName: string) => string | null;
export {};