import * as t from '@rekajs/types';
import { Extension } from './extension';
export type ExtensionStateDefinition = Record<string, any>;
type Require<T, K extends keyof T> = T & {
    [P in K]-?: T[P];
};
export interface ExtensionConfig<S extends ExtensionStateDefinition | any = undefined> {
    key: string;
    state: S;
    init: (extension: Extension<ExtensionDefinition<S>>) => void;
    dispose: (extension: Extension<ExtensionDefinition<S>>) => void;
    fromJSON: (state: any) => S;
}
export type ExtensionStateFromDefinition<D extends ExtensionDefinition> = D['state'];
export declare class ExtensionDefinition<S extends ExtensionStateDefinition | any = any> {
    key: string;
    globals: Record<string, any>;
    components: t.Component[];
    state: S;
    fromJSON: (state: any) => S;
    init: (extension: Extension<ExtensionDefinition<S>>) => void;
    dispose: (extension: Extension<ExtensionDefinition<S>>) => void;
    constructor(config: Require<Partial<ExtensionConfig<S>>, 'key'>);
}
export declare const createExtension: <S extends ExtensionStateDefinition>(config: Require<Partial<ExtensionConfig<S>>, "key">) => ExtensionDefinition<S>;
export {};