Cannot find files with multiple extensions (e.g. fileName.decorator.js)

We have some files in the codebase with filenames like `fileName.decorator.js`. These get a "required module not found" error with flow.
Have tried editing the options as
```
[options]
module.file_ext=.decorator
```
and also
```
[options]
module.file_ext=.decorator.js
```
but neither seems to be doing the trick. Was wondering if I'm missing something?

Thanks a lot!