export declare function deleteUndefinedValueProps<O>(obj: O): O;
export declare function uid(): string;
export declare function judgingTheSignOfNumber(num: string | number): -1 | 0 | 1;
export declare function measureText({ fontFamily, fontSize, text }: {
    fontFamily: string;
    fontSize: number | string;
    text: string;
}): TextMetrics;
export declare function defaultsDeep<T extends {
    [k: string]: any;
} | any[], S extends {
    [k: string]: any;
} | any[]>(target: T, source: S, { overlay, depth, currentDepth }?: {
    overlay?: boolean;
    depth?: number;
    currentDepth?: number;
}): T & S;