danger pr throwing "Cannot find module 'package.json'"

👋 I’m currently trying to add danger to my project. I’ve set up my dangerfile.js as so:

const { danger, fail } = require('danger')

const someoneAssigned = danger.github.pr.assignee
if (someoneAssigned === null) {
  fail("Please assign someone to merge this PR, and optionally include people who should review.")
}

and if I run danger pr I get back an error:

> danger pr https://github.com/artsy/positron/pull/1
(node:97283) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): Error: Cannot find module 'package.json'
(node:97283) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I have danger installed both globally and to my project repo. My local version of Node is v7.10.0. Any thoughts?

[threeve]

This really bummed me out just now trying to set up danger on our project finally. Until the new version of Jest is released it seems that a simple workaround is to ensure you have a .babelrc file in your project containing simply an empty json object {}. With that in place I’m able to get danger working both on jenkins and locally with danger pr 👍

[hramos]

I’ve been running into this as well. Looks like this is fixed in jest#master, and the fix is available in Jest 20.1.0-alpha.3. I’m guessing we won’t want to move Danger to an alpha release just yet, so we’ll need to wait for the final Jest 20.1.0 release to become available.