Maybe add jest to dev dependencies?

[kasperpeulen]

There is no jest in dev-dependencies. I'm not sure if it is good idea to hide this. For example, I get this error message when installing the type definition of jest:

⇒  flow-typed install jest        
• Found flow-bin@v0.32.0 installed. Installing libdefs compatible with this version of Flow...
ERROR: Please specify an npm package name of the format 'foo@1.2.3'

But it is not trivial to find out now which version of jest I'm actually using.

[gaearon]

We should have a better integration with flow-typed. cc @thejameskyle

In the meantime, you can learn your Jest version by checking jest in dependencies of node_modules/react-scripts/package.json.

[gaearon]

Going to close this in favor of #453.