import { IExtensionFactory, IExtensionInstance } from './IExtension';
import GltfLoader from '../io/GltfLoader';
/**
 * This class provides functionalities for managing a list of extensions
 */
export declare class ExtensionList {
    /**
     * Map of extensions by name
     */
    _map: Record<string, IExtensionInstance>;
    /**
     * Array of extensions
     */
    _list: IExtensionInstance[];
    /**
     * Add an extension to the list, will throw if extension already exists
     * @param ext Extension to add
     */
    addExtension(ext: IExtensionInstance): void;
    /**
     * Sort extensions _list by priority, highest priority first
     */
    sort(): void;
    /**
     * Check if this list contains a list of given extensions
     * @param used List of used but not necessary extensions, will only warn if missing
     * @param required List of necessary extensions, will throw if missing
     */
    validate(used?: string[], required?: string[]): void;
}
/**
 * This class manages all the extensions activated for Gltf processing (like KHR_texture_transform, EXT_texture_webp, ...)
 */
declare class ExtensionsRegistry {
    /**
     * Map of extensions factories by name
     */
    _extensionFactories: Record<string, IExtensionFactory>;
    constructor();
    /**
     * Add an extension factory to the registry
     * @param ext Extension factory to add to the registry
     */
    addExtension(ext: IExtensionFactory): void;
    /**
     * Setup extensions for a given loader, will create extension instances from extension factories
     * @param loader Loader to setup extensions for
     * @param additionalExtensions Additional extensions not yet added in the registry
     */
    setupExtensions(loader: GltfLoader, additionalExtensions?: IExtensionFactory[]): void;
}
export default ExtensionsRegistry;