export declare class KeyPair<TKey = any, TValue = any> {
    key?: TKey | null;
    value?: TValue | null;
    constructor(init?: Partial<KeyPair>);
}
export declare class KeyPairEx<TKey = any, TValue = any> extends KeyPair<TKey, TValue> {
    [key: string]: any;
}
export declare class KeyPairChecked<TKey = any, TValue = any> extends KeyPair<TKey, TValue> {
    checked?: boolean | null;
}
export declare class KeyPairRequired<TKey = any, TValue = any> extends KeyPair<TKey, TValue> {
    required?: boolean | null;
}