export default class Conf<T> implements Iterable<[string, T]> {
    readonly path: string;
    readonly size: number;
    constructor(options?: any);
    private throwEnvNotSetErr;
    [Symbol.iterator](): Iterator<[string, T]>;
    set(key: string, value: T): void;
    isExpired(key: T): boolean;
    get(key: string, defaultValue?: T): void;
    has(key: string): void;
    delete(key: string): void;
    clear(): void;
    onDidChange(key: string, callback: (newValue: T | undefined, oldValue: T | undefined) => void): void;
    onDidAnyChange(callback: (oldValue: Record<string, T> | undefined, newValue: Record<string, T> | undefined) => void): void;
}