export declare class NativeStyleMap {
    _map: Map<string, string>;
    constructor();
    set(key: string, value: string): NativeStyleMap;
    delete(key: string): NativeStyleMap;
    forEach(fn: (value: string, key: string) => void): void;
    mergeTo(dst: NativeStyleMap): NativeStyleMap;
    applyTo(style: CSSStyleDeclaration): NativeStyleMap;
}