Deploying new projects started failing on Netlify. Checking the logs I see something that was not in the logs on previous successful deploys:
Treating warnings a
On June 15 2020 Netlify made a configuration change "adding the environment variable CI to build environments, with the value of true." In your Build and Deploy settings on Netlify change your build command to CI= npm run build
. This will prevent Netlify from treating warnings as errors. More discussion on this issue can be found in Netlify's forums.