Do you want to request a feature or report a bug?

Bug

What is the current behavior?

In a project work workspaces, yarn outdated claims everything is up to date. (The root project has no dependences). yarn workspace api outdated errors with the following:

yarn workspace v1.0.0
yarn outdated v1.0.0
error No lockfile in this directory. Run `yarn install` to generate one.
error Command failed.
Exit code: 1
Command: /usr/local/Cellar/node/8.4.0/bin/node
Arguments: /usr/local/Cellar/yarn/1.0.0_1/libexec/lib/cli.js outdated
Directory: /Volumes/git/project/packages/api
Output:

info Visit https://yarnpkg.com/en/docs/cli/workspace for documentation about this command.

If the current behavior is a bug, please provide the steps to reproduce.

What is the expected behavior?

I expect it to tell me the outdated modules.

Please mention your node.js, yarn and operating system version.

yarn 1.0.0