export declare function isNumber(val: unknown): val is number;
export declare function isntNumber<T>(val: T): val is Exclude<T, number>;
export declare function isFinite(val: number): boolean;
export declare function isPositiveInfinity(val: number): boolean;
export declare function isNegativeInfinity(val: number): boolean;
export declare function isNaN(val: number): boolean;
export declare function isntNaN(val: number): boolean;