import { ExtensionDefinition } from './definition';
import { Extension } from './extension';
import { Reka } from '../reka';
export declare class ExtensionRegistry {
    readonly reka: Reka;
    private keyToExtension;
    extensions: Extension[];
    constructor(reka: Reka, definitions: ExtensionDefinition[]);
    init(): void;
    dispose(): void;
    getExtensionFromDefinition<D extends ExtensionDefinition<any>>(definition: D): Extension<D>;
    getExtensionStateValue<D extends ExtensionDefinition<any>>(definition: D): D["state"];
}