use Requirejs or a similar tool to build a single-file JS code by linking a module made of multiple JS files

I wrote a code [login to view URL] that loads and uses a third party module: const foo = require('foo'); ... var x = [login to view URL](data); I installed the module foo with npm install. I can run [login to view URL] from terminal and it works. Now I want to build a single JS file that I could use in a browser. The problem is that the module foo is not just a code named [login to view URL], but a folder ./node_modules/foo/dist/ with 3 JS files in it: [login to view URL], [login to view URL], c.js. I used Requirejs and I managed to build a sample bundle out of [login to view URL] and some other module bar but only when it consists of a single file bar.js. When I'm trying to do the same with foo, I'm getting the error Tracing dependencies for: main Error: ENOENT: no such file or directory, open '/home/greg/blabla/node_modules/[login to view URL]' Indeed foo is not a file but a directory that contains the code files. How do I get around this issue and load a module made of multiple JS scrips by referring to the module name and not to the individual JS file name(s)? Please bid if you know how. This should be a 5-10 min job for an expert. I also tried Browserify. It creates a single bundle JS file without complaints and I can see that this file actually includes the codes from all 3 of the module's JS files, but the bundled JS code fails to work in a browser because it still contains a require() call in it...