import type { ManifestBase } from '../types/index.js';
import type { UmbExtensionRegistry } from '../registry/extension.registry.js';
import type { SpecificManifestTypeOrManifestBase } from '../types/map.types.js';
import { UmbControllerBase } from '../../class-api/index.js';
import type { UmbElement } from '../../element-api/index.js';
/**
 * Base class for extension initializers, which are responsible for loading and unloading extensions.
 */
export declare abstract class UmbExtensionInitializerBase<Key extends string, T extends ManifestBase = SpecificManifestTypeOrManifestBase<UmbExtensionManifest, Key>> extends UmbControllerBase {
    #private;
    protected host: UmbElement;
    protected extensionRegistry: UmbExtensionRegistry<T, import("../index.js").UmbConditionConfigBase<string>, ManifestBase | T>;
    loaded: import("rxjs").Observable<void>;
    constructor(host: UmbElement, extensionRegistry: UmbExtensionRegistry<T>, manifestType: Key);
    /**
     * Perform any logic required to instantiate the extension.
     */
    abstract instantiateExtension(manifest: T): Promise<void> | void;
    /**
     * Perform any logic required to unload the extension.
     */
    abstract unloadExtension(manifest: T): Promise<void> | void;
}