export declare function DCHECK(bool: boolean): void;
export declare function DCHECK_EQ(a: any, b: any): void;
export declare function DCHECK_NE(a: any, b: any): void;
export declare function isUndefined(a: any): boolean;
export declare function isNil(a: any): boolean;
export declare function isNumber(value: any): value is number;
export declare function isFunction(value: any): value is Function;
export declare function isBoolean(value: any): value is boolean;
export declare function isObject(value: any): value is object;