declare function lighten(hexColor: string): string;
declare function darken(hexColor: string): string;
declare function optionsMerge(...targets: any[]): object;
declare function isNull(arg: any): boolean;
declare function isUndefined(arg: any): boolean;
declare function isEmptyStr(arg: any): boolean;
declare function isNothing(arg: any): boolean;
declare function debounce(func: any, interval: number): () => void;
declare function throttle(func: any, interval: number): () => void;
export { lighten, darken, optionsMerge, isNull, isUndefined, isEmptyStr, isNothing, debounce, throttle, };