interface FeedItemOptionsimport { type FeedItemOptions } from "https://deno.land/x/lume@v2.1.2/plugins/feed.ts"; Propertiesoptionaltitle: string | ((data: Data) => string | undefined)The item title optionaldescription: string | ((data: Data) => string | undefined)The item description optionalpublished: string | ((data: Data) => Date | undefined)The item published date optionalupdated: string | ((data: Data) => Date | undefined)The item updated date optionalcontent: string | ((data: Data) => string | undefined)The item content optionallang: string | ((data: Data) => string | undefined)The item language