Create-react-app: Question: *** process.env.ENV is not defined, assuming 'prod' env

[mnemanja]

Starting from version 1.0.5 I've started getting this warning message in the browser console.

I've been wondering on how to get rid of it. I know how to create a custom variable, but I'm not sure how the process.env.ENV should be defined?

1. node -v: 6.10.0
2. npm -v: 5.0.4

3. npm ls react-scripts: 1.0.5

4. Operating system: Windows 10

5. Browser and version (if relevant): Chrome

Cheers,
Nemanja

[gaearon]

Please edit the bug report to follow the issue template. You didn't specify most of the information we need to diagnose the issue. Thanks!

[gaearon]

(At the very least we'll need the full message text, preferably a screenshot, and steps to reproduce.)

[gaearon]

Thanks for the screenshot.

This is not a warning from React or Create React App.
It comes from some third party library you’re using.
Try searching node_modules/**/*.js for this message and you’ll find which library it’s coming from.

I don’t know how this could be related to our updates, but I can only say more if you provide a project reproducing it.

[nerdymax]

@mnemanja This warning comes from the latest Chrome update. Any React app I use where the ENV variable is not defined produces this error for me.

[mayurvarma14]

@mnemanja Even I had same issue, it was coming from one of the chrome extension (Grammarly for Chrome). Disabling the extension solved problem!!

[mnemanja]

Thanks @mayurvarma14, I can confirm this behavior coming from the Grammarly extension.

[mayurvarma14]

@mnemanja Welcome!

[xtremetom]

Thanks mayurvarma14

[gaearon]

Since we figured out what causes it, I’ll lock the thread to prevent additional +1’s.