export declare namespace json {
    /**
     * Retrieve a JSON file asynchronous. Supports `extends` with one or many existing JSON files.
     *
     * @template T
     * @param {string} filePath path to a JSON file.
     * @param {{ [id: string]: string }} [namedExtends] A key value pair of named extends paths.
     *
     * @example
     * import { json } from "@speedy/json-extends";
     *
     * const named = {
     * 	"@speedy/commit-msg-hook:latest": "./node_modules/config/config.json"
     * };
     *
     * json.read("local-config.json", named)
     * 	.then(content => {
     * 		// json content
     * 	});
     *
     * @returns {Promise<T>}
     */
    function read<T>(filePath: string, namedExtends?: {
        [id: string]: string;
    }): Promise<T>;
    /**
     * Retrieve a JSON file synchronously. Supports `extends` with one or many existing JSON files.
     *
     * @template T
     * @param {string} filePath path to a JSON file.
     * @param {{ [id: string]: string }} [namedExtends] A key value pair of named extends paths.
     *
     * @example
     * import { json } from "@speedy/json-extends";
     *
     * const named = {
     * 	"@speedy/commit-msg-hook:latest": "./node_modules/config/config.json"
     * };
     *
     * const content = json.readSync("local-config.json", named);
     *
     * @returns {T}
     */
    function readSync<T>(filePath: string, namedExtends?: {
        [id: string]: string;
    }): T;
}