import { type SystemConfig, type WebsocketServerConfig } from '@citrineos/types';
import type { IFileStorage } from '../interfaces/files/file-storage.js';
export declare class ConfigLoader {
    private static websocketServers;
    static loadConfig(): Promise<SystemConfig>;
    /**
     * Reads and validates the websocket servers this pod hosts, or returns the already
     * read config. The returned array is shared with every other caller — see
     * {@link websocketServers}.
     *
     * @param fileStorage Storage the file is read through; keys resolve against its root.
     * @param fileName `SystemConfig.websocketServerConfigFile`.
     * @throws If the file is missing or fails schema validation.
     */
    static loadWebsocketServersConfig(fileStorage: IFileStorage, fileName: string): Promise<WebsocketServerConfig[]>;
    /**
     * Validates and writes the websocket servers config back to storage, then brings the
     * shared array up to date.
     *
     * @throws If `websocketServers` fails schema validation. Nothing is written or updated
     *   in that case.
     */
    static saveWebsocketServersConfig(fileStorage: IFileStorage, fileName: string, websocketServers: WebsocketServerConfig[]): Promise<void>;
    /**
     * Merges configuration from environment variables into the default configuration. Allows any to keep it as generic as possible.
     * @param config The default configuration.
     * @param envVars The environment variables.
     * @returns The merged configuration.
     */
    private static mergeConfigFromEnvVars;
    /**
     * Resolves one path segment against a level of the key map.
     *
     * A level holds leaf fields as `lowercasename -> realKey` and nested objects as
     * `realKey -> submap`, so both spellings have to be tried.
     *
     * @returns The real schema key, plus the submap to descend into when the segment named
     *   a nested object. `child` is undefined for a leaf field, which is what tells the
     *   caller that a further segment cannot resolve. Undefined when nothing matched.
     */
    private static lookupSegment;
    private static getZodSchemaKeyMap;
}