Yarn is not installed on the Xcode 8.2 stack

[viktorbenei]

Hi @QuinnStephens,

That’s not a “bug”. We don’t install tools or update tool versions on previous stack versions. The Xcode 8.2 stack will have the same tools & versions as long as it’s available.

You can read more about the stack types and update policy at:

How are the bitrise.io stacks updated and with what frequency? What's the stack deprecation / removal policy?

The stacks on bitrise.io are updated every weekend, but what’s updated depends on the stack. There are stacks where only certain caches are updated (no preinstalled tools etc.), and there are stacks which are completely re-built every week. You can find the update type of the stacks below. Xcode stacks Xcode stacks, except the “Edge” one, are built once, and are not updated at all, except with Bitrise CLI related updates, dependency manager cache updates and with critical fixes. These are Stabl…

To install a tool which is not preinstalled, you can use e.g. a Script step and a package manager like brew. Related docs: Installing tools during a build - Bitrise Docs

If you have any questions just let us know!