title: Import extension file automatically in flutter
body: <p>I'm using AndroidStudio to develop flutter, I have a file named <code>extensions.dart</code> for my extensions, when I want to use an extension inside another file, I have to import extensions file manually (like <code>import '../../../../utils/extensions.dart';</code>) otherwise auto compilation doesn't work and also this process is kind of annoying. How can I force AndroidStudio to import extensions file automatically?</p>