Navbar not working?

Question

css

Good day, I use the Gulp assembler and for some reason the adaptive menu does not work for me (bootstrap 4)
It seems that everything is connected, but the menu is just open and nothing happens when you click on the menu hamburger
Here is the project:
proglass.localtunnel.me
Even errors in the developer console no.

Here are the settings of the gulp file

Styles

Answer 1

You've lost the bootstrap styles for transitions. That's why the navbar doesn't collapse - there are no styles for that.
I also see that the dropdown menu is not hidden, but you need to add a script there
$('.dropdown-toggle').dropdown()