Building ionic 4 project doesn't work

Hello everyone,

I have built a project using Ionic 4. The project is meant to be for the web (so no plugins needed only ionic and angular). However, everytime I try to build the project using the command “ionic build --prod” it would run and show no errors, but at the www folder all other map and ts files still exist after running and the html page show blank. I tried building the project using cordova browser command, but the issue still exists. Any one can help please ? I don’t know what files to submit here so please let me know what you need.