So I started to learn Ionic and got an issue with environment variables.
I created an env.local file inside the root folder, added REACT_APP_API:'...'.
I did stop and restart the server but my console.log(process.env.REACT_APP_API) log undefined and not the text inside of it.
Am I using it wrong with Ionic?
Solution:
I changed it to REACT_APP_API=myurl and it solved my issue as @MarcoKlein said.