package:foo

This is an example package that has a DevTools extension shipped with it. See the extension/devtools directory. There you will find the two requirements for the parent package that is providing a DevTools extension:

1. A config.yaml file that contains metadata DevTools needs to load the extension.
2. The build directory, which contains the pre-compiled build output of the extension Flutter web app (see foo/packages/foo_devtools_extension).