export declare function capitalize(s: string): string;
export type SingletonGetter<T> = {
    get(): T;
};
export declare function singleton<T>(valueGetter: () => T): SingletonGetter<T>;
export declare function mapObject<TKey extends string, TInitialValue, TNewValue>(obj: Record<TKey, TInitialValue>, predicate: (value: TInitialValue, key: TKey) => TNewValue): Record<TKey, TNewValue>;