[Solved] “Treating warnings as errors because of process.env.CI = true”

Did deploying your code to netlify failed and in logs you are getting
Treating warnings as errors because of process.env.CI = true

If yes then you are at the right place. I'll help you fix this error within seconds. Before showing you the fix let's first have a glance at the root cause of this error.

What is this error all about?

Beginning on June 15, 2020, Netlify started a gradual rollout of adding the environment variable CI to build environments, with the value of true. This environment variable, short for Continuous Integration, is commonly set in various CI environments like Travis CI and Github Actions, among many others. The ecosystem has largely agreed to use this environment setting to detect when a build is executing in a CI environment, as opposed to a local development environment.

This setting allows many common libraries to detect a CI environment and change behavior accordingly. One such behavior is the disabling of progress “spinners” that while useful in a local development terminal, can render poorly when operating in a log streamed CI environment.

Because of this some libraries now interpret what were previously just warnings as hard errors and halt the build. The intention is that developers should not ship potentially broken configurations, but the downside is that builds that successfully completed previously started failing after this change.

The fix

If your build is breaking after this change, you can disable this behavior by unsetting the CI variable in your build. For example, the following will unset CI for the NPM command:
CI= npm run build

• Log in to Netlify
• Choose your app and click on Site settings
• Navigate to Build & Deploy
• Under Continuous Deployment select Edit settings
• Update Build command to ```

CI= npm run build
or
CI=false npm run build //OP mentioned below in comments

If you are using `netlify.toml` to set the build command, update it as such:

...
command = "CI= npm run build"
...

*Rebuild you deployment
Now you should see `Production: master@c215c12 Published` 😉

Comments

[Militus]

I did CI=false npm run build and it worked :)

[saurabh daswant]

yup worked for me too

[Bakhodir]

Worked for me too

[João Amadeu]

Worked for me too, I tested on Vercel and Netlify.

[Aditya Narayan Sah]

Fix

• Log in to Netlify
• Choose your app and click on Site settings
• Navigate to Build & Deploy
• Under Continuous Deployment select Edit settings
• Scroll down to Environment variables and add a new Variable with the following values

CI = false

[Raymart Evangelista]

Worked for me too!

[drahdavid]

Thank you so much for the fix and the explanaition. CI=false npm run build worked for me.

[juan]

ty! worked for me deploying a react app to vercel
just override the build command with CI= npm run build

[Nitika Sharma]

It worked! Thanks :)

[desdamo]

Hello. I tried différents write but didn't work with vercel. Can you help me please?

"scripts": {
"start": "craco start",
"build": "CI='' yarn build",
"test": "craco test",

"eject": "react-scripts eject"

},

[KelahKelah]

Thanks. This solved the problem for me.
I used yarn and already had a yarn.lock file so automatically the Build command already had 'yarn build' so all i did was add CI = to the yarn build and it worked.
Like
Build command: CI= yarn build.

But for npm it would be
Build command: CI= npm run build

[Militus]

Hi, I'm almost completely new. I tried CI= npm run build but it didn't work, I guess I'm doing sth wrong. Any ideas on how to fix this on vercel?

[Josias Aurel]

On vercel and netlify, setting CI to false in environment variables make it work XD

[Ahmed Sarhan]

I just signed in to say thank you ... this saved my day

[Chaz Kiker]

retweet

[Sungguk Cho]

THANKS !!

CI=false npm run build
working in gitlab ci
but in other cases, i think
Ci='' would be good
because sometimes the false string means true not false

reference below
docs.netlify.com/configure-builds/...