import { NzSafeAny } from '../types/any';
import { IndexableObject } from '../types/indexable';
export declare function isNotNil<T>(value: T): value is NonNullable<T>;
export declare function isNil(value: unknown): value is null | undefined;
/**
 * Examine if two objects are shallowly equaled.
 */
export declare function shallowEqual(objA?: IndexableObject, objB?: IndexableObject): boolean;
export declare function isNonEmptyString(value: NzSafeAny): boolean;
export declare function isTemplateRef(value: NzSafeAny): boolean;