import type { IEnvironment } from '../shared/types.js';
import { type IResolvedConfig } from './types.js';
/**
 * Reads the configuration file and returns the configuration object.
 * @param configPath The path to the configuration file.
 * @param environment The current environment.
 * @returns The configuration object.
 * @throws
 * - FAILED_TO_READ_BASE_CONFIG: if the base configuration file could not be read or parsed.
 * - INVALID_FIREBASE_CONFIG: if the configured env var key is invalid or not set.
 * - INVALID_ENVIRONMENT: if the provided environment is not recognized.
 * - FAILED_TO_READ_FIREBASE_CONFIG: if the Firebase configuration could not be read from the environment variable.
 * - FAILED_TO_BUILD_CONFIG: if the configuration file could not be read or parsed.
 */
export declare const readConfigFile: (configPath: string, environment: IEnvironment | undefined) => IResolvedConfig;