import type { EntityType, OpenContainerDataType, Placeholder, Ref, RegisteredEntity, RegisteredOpenContainerEntity } from '../../core';
export declare const isNothing: (obj: unknown) => obj is void;
export declare const isObject: <T extends {
    [key: string]: unknown;
}>(obj: unknown) => obj is T;
export declare const isScalar: (obj: unknown) => obj is string | number | boolean | void;
export declare const isRef: (obj: unknown) => obj is Ref;
export declare const isPlaceholder: (obj: unknown) => obj is Placeholder<any>;
export declare const isOpenContainer: (entity: EntityType<unknown>) => entity is EntityType<OpenContainerDataType>;
export declare const isRegisteredOpenContainerEntity: (entity: RegisteredEntity) => entity is RegisteredOpenContainerEntity;
export declare const isContainer: (entity: EntityType<unknown>) => entity is EntityType<OpenContainerDataType>;