/**
*  @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 { JsonInputOptionsBrowser, JsonOutputOptionsBrowser } from '../../shared/types';
import { DataFrame, NDframe, Series } from '../../';
/**
 * Reads a JSON file from local or remote location into a DataFrame.
 * @param fileName 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 { readJSON } from "danfojs-node"
 * const df = await readJSON("https://raw.githubusercontent.com/test.json")
 * ```
 * @example
 * ```
 * import { readJSON } from "danfojs-node"
 * const df = await readJSON("https://raw.githubusercontent.com/test.json", {
 *    headers: {
 *      Accept: "text/json",
 *      Authorization: "Bearer YWRtaW46YWRtaW4="
 *    }
 * })
 * ```
 * @example
 * ```
 * import { readJSON } from "danfojs-node"
 * const df = await readJSON("./data/sample.json")
 * ```
 */
declare const $readJSON: (file: any, options?: JsonInputOptionsBrowser | undefined) => Promise<unknown>;
/**
 * Converts a DataFrame or Series to JSON.
 * @param df DataFrame or Series to be converted to JSON.
 * @param options Configuration object. Supported options:
 * - `fileName`: The file path to write the JSON to. If not specified, the JSON object is returned.
 * - `format`: The format of the JSON. Defaults to `'column'`. E.g for using `column` format:
 * ```
 * [{ "a": 1, "b": 2, "c": 3, "d": 4 },
 *  { "a": 5, "b": 6, "c": 7, "d": 8 }]
 * ```
 * and `row` format:
 * ```
 * { "a": [1, 5, 9],
 *  "b": [2, 6, 10]
 * }
 * ```
 * @example
 * ```
 * import { toJSON } from "danfojs-node"
 * const df = new DataFrame([[1, 2, 3], [4, 5, 6]])
 * const json = toJSON(df)
 * ```
 * @example
 * ```
 * import { toJSON } from "danfojs-node"
 * const df = new DataFrame([[1, 2, 3], [4, 5, 6]])
 * toJSON(df, {
 *     fileName: "./data/sample.json",
 *     format: "row"
 *   })
 * ```
 */
declare const $toJSON: (df: NDframe | DataFrame | Series, options?: JsonOutputOptionsBrowser | undefined) => object | void;
export { $readJSON, $toJSON };