Typescript mimetypes as a set of constant strings. I prefer this to the TS enum type.

mimetypes.ts

export type MimeTypes =
  | "audio/aac"
  | "application/x-abiword"
  | "application/x-freearc"
  | "video/x-msvideo"
  | "application/vnd.amazon.ebook"
  | "application/octet-stream"
  | "image/bmp"
  | "application/x-bzip"
  | "application/x-bzip2"
  | "application/x-csh"
  | "text/css"
  | "text/csv"
  | "application/msword"
  | "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
  | "application/vnd.ms-fontobject"
  | "application/epub+zip"
  | "application/gzip"
  | "image/gif"
  | "text/html"
  | "image/vnd.microsoft.icon"
  | "text/calendar"
  | "application/java-archive"
  | "image/jpg"
  | "image/jpeg"
  | "text/javascript"
  | "application/javascript"
  | "application/json"
  | "application/ld+json"
  | "audio/midi"
  | "audio/mpeg"
  | "video/mpeg"
  | "application/vnd.apple.installer+xml"
  | "application/vnd.oasis.opendocument.presentation"
  | "application/vnd.oasis.opendocument.spreadsheet"
  | "application/vnd.oasis.opendocument.text"
  | "audio/ogg"
  | "video/ogg"
  | "application/ogg"
  | "audio/opus"
  | "font/otf"
  | "image/png"
  | "application/pdf"
  | "application/php"
  | "application/vnd.ms-powerpoint"
  | "application/vnd.openxmlformats-officedocument.presentationml.presentation"
  | "application/vnd.rar"
  | "application/rtf"
  | "application/x-sh"
  | "image/svg+xml"
  | "application/x-shockwave-flash"
  | "application/x-tar"
  | "image/tiff"
  | "video/mp2t"
  | "font/ttf"
  | "text/plain"
  | "application/vnd.visio"
  | "audio/wav"
  | "audio/webm"
  | "video/webm"
  | "image/webp"
  | "font/woff"
  | "font/woff2"
  | "application/xhtml+xml"
  | "application/vnd.ms-excel"
  | "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
  | "application/xml"
  | "text/xml"
  | "application/vnd.mozilla.xul+xml"
  | "application/zip"
  | "video/3gpp"
  | "video/3gpp2"
  | "application/x-7z-compressed";