import { Type } from "./Utils.js";
export default interface Extendable<ComponentClass> {
    as<C extends ComponentClass>(type: Type<C>): C;
    asOptional<C extends ComponentClass>(type: Type<C>): C | null;
    has<C extends ComponentClass>(type: Type<C>): boolean;
    /**
     * @throws MissingComponentError
     */
    require<C extends ComponentClass>(type: Type<C>): void;
}
export declare class MissingComponentError<ComponentClass> extends Error {
    constructor(type: Type<ComponentClass>);
}