import { DokkimiConfig, RuntimeConfig } from './config.types';
export declare class ConfigLoader {
    private static instance;
    private config;
    private constructor();
    static getInstance(): ConfigLoader;
    /**
     * Load configuration from YAML file
     * Must be called during application startup before any services initialize
     */
    load(configPath?: string): DokkimiConfig;
    /**
     * Get loaded configuration
     * Throws if configuration hasn't been loaded yet
     */
    getConfig(): DokkimiConfig;
    /**
     * Get runtime configuration from environment variables
     * These are instance-specific values not in the static config files
     */
    getRuntimeConfig(): RuntimeConfig;
    /**
     * Recursively expand ~ to the user's home directory in all string values.
     */
    private expandTildePaths;
    /**
     * Apply environment variable overrides to the loaded config.
     * Only HOST overrides are supported — port values come from the config file.
     */
    private applyEnvOverrides;
    /**
     * Helper to get required environment variable
     */
    private getRequiredEnv;
}
export declare const loadConfig: (configPath?: string) => DokkimiConfig;
export declare const getConfig: () => DokkimiConfig;
export declare const getRuntimeConfig: () => RuntimeConfig;