/**
*  @license
* Copyright 2022 JsData. All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.

* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ==========================================================================
*/
import { ExcelInputOptionsNode, ExcelOutputOptionsNode } from "../../shared/types";
import { DataFrame, NDframe, Series } from '../../';
/**
 * Reads a JSON file from local or remote location into a DataFrame.
 * @param filePath URL or local file path to JSON file.
 * @param options Configuration object. Supported options:
 * - `method`: The HTTP method to use. Defaults to `'GET'`.
 * - `headers`: Additional headers to send with the request. Supports the `node-fetch` [HeadersInit]
 * @example
 * ```
 * import { readExcel } from "danfojs-node"
 * const df = await readExcel("https://raw.githubusercontent.com/test.xlsx")
 * ```
 * @example
 * ```
 * import { readExcel } from "danfojs-node"
 * const df = await readExcel("https://raw.githubusercontent.com/test.xlsx", {
 *    method: "GET",
 *    headers: {
 *      Accept: "text/csv",
 *      Authorization: "Bearer YWRtaW46YWRtaW4="
 *    }
 * })
 * ```
 * @example
 * ```
 * import { readExcel } from "danfojs-node"
 * const df = await readExcel("./data/sample.xlsx")
 * ```
 */
declare const $readExcel: (filePath: string, options?: ExcelInputOptionsNode) => Promise<unknown>;
/**
 * Converts a DataFrame or Series to Excel Sheet.
 * @param df DataFrame or Series to be converted to JSON.
 * @param options Configuration object. Supported options:
 * - `sheetName`: The sheet name to be written to. Defaults to `'Sheet1'`.
 * - `filePath`: The filePath to be written to. Defaults to `'./output.xlsx'`.
 * @example
 * ```
 * import { toExcel } from "danfojs-node"
 * const df = new DataFrame([[1, 2, 3], [4, 5, 6]])
 * toExcel(df, {
 *     filePath: "./data/sample.xlsx",
 *     sheetName: "MySheet",
 *   })
 * ```
 */
declare const $toExcel: (df: NDframe | DataFrame | Series, options?: ExcelOutputOptionsNode | undefined) => void;
export { $readExcel, $toExcel };