Fix issue with detecting AMD like imports

[kitsonk]

Fixes the issue mentioned in #3089 (comment). Essentially when we were preprocessing the dependencies, we were looking for JavaScript like dependencies, which include things like AMD and others. Only detecting these when the media type is JS (which implies that checkJs is enabled and we could be transpiling AMD/CommonJS/etc to ESM) should eliminate improper detection.

[bartlomieju]

LGTM

[kevinkassimo]

This actually was one of the issues I had with require() polyfill in std/node before, that I have to call the function require_(). I guess now we can finally update the docs to normal require()