Interface CustomElementRegistry

interface CustomElementRegistry {
    define(
        name: string,
        constructor: CustomElementConstructor,
        options?: ElementDefinitionOptions,
    ): void;
    get(name: string): undefined | CustomElementConstructor;
    getName(constructor: CustomElementConstructor): null | string;
    upgrade(root: Node): void;
    whenDefined(name: string): Promise<CustomElementConstructor>;
}