Hey, I tried implementing Workspaces on a repo and here is some feedback that you might be interested in.

Basically I am having trouble running yarn outdated, yarn upgrade-interactive or other similar commands in a workspaces project.

What is the current behavior?
yarn outdated or yarn upgrade-interactive run from the root folder work only for the root package.json.
If I run those commands in a packages/* folder the error No lockfile in this directory. Run 'yarn install' to generate one. comes up.

What is the expected behavior?
yarn outdated or yarn upgrade-interactive should also check workspaces folders when run from root folder.

Please mention your node.js, yarn and operating system version.
yarn v1.0.2 with workspaces flag enabled
node v8.5.0

This is related to #4442