title: Flutter package's own import target URI does not exist
body: <p>I have a Flutter project that I started as a package in order for it to speak to platform specific native code.   I've updated several packages lately along with flutter and my</p>
  <blockquote>
  <p>import: package: mypackage/mypackage.dart</p>
  </blockquote>
  <p>is no longer working.  The dart analysis says the target URI doesn't exist and none of the of solutions for outside packages seem to work for me.  Any ideas on how I can correct this issue?</p>