Using environment variables we can change the default behavior of react scripts.
To set environment variables in React build, first install the:
"env-cmd" package
npm i --save env-cmd
Create an environment file, e.g env.production or env.iis
Add variables like
PUBLIC_URL=/myurl/ (for base url)
BUILD_PATH=..//..//publish (where to store the build output)
BROWSER=none (don't open browser)
Then add the variable loading in the npm script:
e.g.
"build": "env-cmd -f .env.iis react-scripts build"