If user has higher role than bot

Currently i have this code:

    let targetMember =
      message.mentions.members?.first()

    let targetMember =
      message.mentions.members?.first()

    let targetMember =
      message.mentions.members?.first()

    let targetMember =
      message.mentions.members?.first()

how can i check if the bot has a lower role than targetMember?