export declare const NSKeyValueObservingOptions: {
    readonly NSKeyValueObservingOptionNew: 1;
    readonly NSKeyValueObservingOptionOld: 2;
    readonly NSKeyValueObservingOptionInitial: 4;
    readonly NSKeyValueObservingOptionPrior: 8;
};
export type NSKeyValueObservingOptions = (number & {}) | typeof NSKeyValueObservingOptions[keyof typeof NSKeyValueObservingOptions];
