/**
 * Reads a JSON file, either via Node’s fs (if available)
 * or via window.fetch in the browser. Never throws — returns
 * the parsed object or null on any error.
 */
export declare function readJsonFile<T = any>(relativeOrAbsolutePath: string): Promise<T | null>;
export declare function getConfigContent<T = Record<string, any>>(): Promise<T | null>;
export declare function getConfigVar<T = any>(key?: any): Promise<T | undefined>;