I followed the instructions in https://getbootstrap.com/docs/4.0/getting-started/webpack/ and I also installed jquery and popper.js with npm.
Still when I use the output bundle.js, the browser keeps on sending GET requests for popper.js.map and I need all the assets to be part of the bundle.js.
I searched a lot for the proper answer but none that explains whats wrong with the instructions mentioned above, exists. Please help.
At the very end of the popper.js file there is a comment like this:
//# sourceMappingURL=popper.js.map
Removing the commented line fixed the issue for me.