export declare function roundToDigits(val: number, digits?: number): number;
export declare function isNumber(value: any): value is number;
export declare function isString(value: any): value is string;
export declare function isBigInt(value: any): value is bigint;
export declare function isObject(value: any): value is object;
export declare function isArray(value: any): value is any[];
export declare function isBoolean(value: any): value is boolean;
export declare function isFunction(value: any): value is Function;