HMR is not working out of box (does a full page refresh) #3215

Is this a bug report?

Yes

Can you also reproduce the problem with npm 4.x?

Yes

Which terms did you search for in User Guide?

hmr, hot

Environment

1. node -v: 8.3.0
2. npm -v: 4.6.1
3. yarn --version (if you use Yarn): 0.27.5
4. npm ls react-scripts (if you haven’t ejected): 1.0.14

Then, specify:

1. Operating system: macOS Sierra
2. Browser and version (if relevant): Chrome 61.0.3163.100

Steps to Reproduce

cd whatever
npm run start
modify the Welcome to react text in an editor

(Write your steps here:)

1. create-react-app whatever
2. cd whatever
3. npm run start
4. Preserve log in the net tab on the site (Chrome)
5. modify the Welcome to react text in an editor (in App.js) and save

Expected Behavior

The page should update without a full reload (eg it should HotReload).

Actual Behavior

If you look in the net tab its refreshing the page. You can also see it flicker as it reloads.

Something in the HMR stack isn't working correctly out of the box.

Reproducible Demo

https://github.com/lukemcgregor/create-react-hmr-not-working

see instructions above