/**
 * Singleton configuration manager backed by an in-memory Map.
 */
export declare class ConfigManager {
    private static instance;
    private config;
    /**
     * Creates a new ConfigManager instance.
     */
    private constructor();
    /**
     * Returns the singleton instance of the ConfigManager.
     * @returns The singleton ConfigManager instance.
     */
    static getInstance(): ConfigManager;
    /**
     * Gets a configuration value by key.
     * @param key - Configuration key to retrieve.
     * @returns The stored configuration value, or undefined if missing.
     */
    get(key: string): any;
    /**
     * Sets a configuration value by key.
     * @param key - Configuration key to set.
     * @param value - Configuration value to store.
     * @returns No return value.
     */
    set(key: string, value: any): void;
}
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