import { TreeLike } from './tree';
/**
 * Checks if a specified file in a tree-like structure is a valid JSON file.
 *
 * This function determines whether a file at a given path within a tree-like structure
 * contains valid JSON content. It utilizes a `TreeAdapter` to interact with the tree structure,
 * allowing it to check for the existence of the file and to read its contents.
 *
 * @param tree - An object representing the tree-like structure. Must be compatible with the `TreeAdapter`.
 * @param filePath - The path to the file within the tree structure to be checked.
 * @returns `true` if the file exists and contains valid JSON content, otherwise `false`.
 *
 * @typeParam Tree - The type of the tree structure that extends `TreeLike`, ensuring compatibility with `TreeAdapter`.
 *
 * @example
 * // Assuming `projectFiles` is a tree-like structure that includes a file at 'data/config.json'
 * const isValidJson = HasJsonFile(projectFiles, 'data/config.json');
 * console.log(isValidJson); // Outputs: true or false based on the file's content validity as JSON.
 */
export declare function HasJsonFile<Tree extends TreeLike>(tree: Tree, filePath: string): boolean;
/**
 * Retrieves the contents of a JSON file and returns it as an object.
 * If the file does not exist and `create` flag is set to `true`, an empty JSON file will be created.
 *
 * @template T - The type of the returned JSON object.
 * @param tree - The file system tree-like object.
 * @param filePath - The path to the JSON file.
 * @param [create=false] - Flag indicating whether to create the file if it does not exist (default: false).
 * @throws If the JSON file does not exist and `create` flag is set to `false`.
 * @throws If the content of the JSON file could not be parsed.
 * @returns {T} The parsed JSON object.
 */
export declare function GetJsonFile<T = any>(tree: TreeLike, filePath: string, create?: boolean): T;
export interface UpdateJsonFileOptions {
    space?: string | number;
    /**
     * true - create the file if it does not exist
     */
    create?: boolean;
}
export declare function UpdateJsonFile<T extends Record<string, any> = Record<string, any>>(tree: TreeLike, updaterOrJsonFile: T | ((jsonFile: T) => void), filePath: string, options?: UpdateJsonFileOptions): void;
export declare function UpdateJsonFile<T extends Record<string, any> = Record<string, any>>(tree: TreeLike, updaterOrJsonFile: T | ((jsonFile: T) => Promise<void>), filePath: string, options?: UpdateJsonFileOptions): Promise<void>;