Getting User Guild Avatar/Banner

Hi I'd like to know how can i get the user's avatar and banner in the current guild

Currently I get the user info from

    let currentUser =
      message.mentions.users.size > 0
        || message.mentions.users.first()

    let currentUser =
      message.mentions.users.size > 0
        || message.mentions.users.first()

    let currentUser =
      message.mentions.users.size > 0
        || message.mentions.users.first()

    let currentUser =
      message.mentions.users.size > 0
        || message.mentions.users.first()