class Feedimport { Feed } from "https://deno.land/x/none@v0.0.6/deps.ts"; ConstructorsnewFeed(options: FeedOptions)PropertiesaddCategory: (category: string) => numberaddContributor: (contributor: Author) => numberaddExtension: (extension: Extension) => numberaddItem: (item: Item) => numberatom1: () => stringcategories: string[]contributors: Author[]extensions: Extension[]items: Item[]json1: () => stringoptions: FeedOptionsrss2: () => string