title: MapEntry - specify type annotation
body: <p>I'm using a linter package to practice strict coding, however, I can't figure out how to solve this warning. The code is working but I just want to understand this warning and how to solve this. I'm new to flutter by the way. Hope someone can answer my question. TIA!</p>
  <p><a href="https://i.stack.imgur.com/7lzXd.png" rel="nofollow noreferrer">Actual Code</a></p>
  <p>PS: sorry, unable to display image because of restriction</p>