import { EventEmitter } from '../utils/EventEmitter';
export declare class ConfigManager extends EventEmitter {
    private static instance;
    private config;
    private logger;
    private constructor();
    static getInstance(): ConfigManager;
    private loadConfig;
    private saveConfig;
    get(key: string, defaultValue?: any): any;
    set(key: string, value: any): void;
    remove(key: string): void;
    clear(): void;
    getAll(): {
        [key: string]: any;
    };
    setMultiple(configs: {
        [key: string]: any;
    }): void;
    has(key: string): boolean;
    subscribe(callback: (config: {
        [key: string]: any;
    }) => void): () => void;
    validate(schema: {
        [key: string]: any;
    }): boolean;
}