Important: This documentation covers Yarn 1 (Classic).
For Yarn 2+ docs and migration guide, see yarnpkg.com.

Package detail

Whoa, _express@4.15.4@express does not exist yet

But that means it is now yours!

$ mkdir _express@4.15.4@express
$ cd _express@4.15.4@express
$ yarn init

Make your package

$ yarn publish