export declare const isNil: (val: unknown) => val is null | undefined;
export declare const isDefined: <T>(val: T) => val is NonNullable<T>;
export declare function isAnyNil(...arr: unknown[]): boolean;
export declare function isAnyDefined(...arr: unknown[]): boolean;
export declare function compareFlatObjects(a: Record<string, unknown>, b: Record<string, unknown>): boolean;