Trouble running examples using npm. What is test:types?

[wdma]

I am trying to run the examples using the npm instructions and am getting the below error. I am not familiar with yarn and have already done quite a bit of debugging. Can you tell me what test:types is and how I provide it so that yarn can find it?

> nexus@1.3.0 test
> yarn test:types && jest --testTimeout 10000

00h00m00s 0/0: : ERROR: [Errno 2] No such file or directory: 'test:types'