Bootstrap dropdown not opening first click on React 16

You should import this line and Test again :

import 'bootstrap/dist/js/bootstrap.bundle';

this work for me like a charm :)

I got the same issue. I noticed that when i was using bootstrap.min.js and jquery.min.js at a same time. Then my dropdown takes two click for toggle in first time after page load. Then i commented bootstrap.min.js. Now it is not giving me this issue. Try this. Maybe it will solve your problem.

You may have jQuery or Bootstrap included twice. I don't use React, but I was having the same problem with Angular. It turns out that I was including jQuery/Bootstrap in my index.html as well my "scripts" configuration (which I think would be your "entry").