Documentation need for using the module in. and html page

If I have a number of script files, normally I include them as:

```

```
but if one of those files needs to use the module, I can't figure out how to import everything so it works.

If I do it this way:
```

import * as id3 from './js/vendor/id3js/id3.js';

```
id3 isn't visible in the script files
while if I include the script files in the module:
```

import * as id3 from './js/vendor/id3js/id3.js';
import './js/foo.js';
import './js/bar.js';

```
I can't use any of their code (I suspect I would have to rewrite everything to be a module)
Is there a way to use this in non-modular javascript?