Support for MIME types as option

[ilsubyeega]

I would like to see the headers like "application/javascript" in the .js file.
Some problems like Failed to load module script: The server responded with a non-JavaScript MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec. (from chrome) could occur, so I'm willing to get this feature. Thank you for creating this, I used a lot

[syntaqx]

It's on my todo list to do some decent overhauls with this project to add more functionality, but I'll keep this in mind on the roadmap for sure. Feel free to open up a pull request if you have a fix in the mean time