import { CustomKey } from './custom-key';
import { PropertyExtensionMetadataCtor } from './property-extension-metadata-ctor';
/**
 * Property extension metadata constructor set key.
 *
 * @type {CustomKey<Set<PropertyExtensionMetadataCtor<any, any, any>>>}
 */
export declare const PROPERTY_EXTENSION_METADATA_CTOR_SET_KEY: CustomKey<Set<PropertyExtensionMetadataCtor<any, any, any, any>>>;
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