How is yarn getting installed?

[BrandonLWhite]

I cannot determine by what mechanism yarn is getting installed by this action. I was hoping to find something explicit in the code that is downloading and installing it, but I found no mention of yarn.

Could you please clarify how setup-node is ensuring that yarn gets installed?

[phartenfeller]

Yarn is automatically preinstalled with hosted runners. (docs)

[RammusXu]

Yarn is automatically preinstalled with hosted runners. (docs)

What if I run on self-hosted runner? Should I install yarn in my runner?

[phartenfeller]

What if I run on self-hosted runner? Should I install yarn in my runner?

Yes, only the runner gets installed.

You can simply install it on the machine and the runner can access it. You don't have to do it in the workflow itself.

[bryanmacfarlane]

questions answered ☝️