Suggested conversion from coffeescript to ES6

Hi:
I implemented the following features in my own init.js:
1. Filter whether automatic opening is enabled based on the file extension.
2. When switching file windows, the preview window will also switch.
3. When the file window is closed, the preview window will also close.

These features are inspired by atom-preview-enhanced, which I find very easy to use, so I implemented these features with reference to atom-preview-enhanced.

I want to merge these implementations into the main branch. However, this package is implemented using coffeescript, Coffeescript is now obsolete and difficult to maintain and develop.
In fact, the atom official has deprecated coffeescript:
https://discuss.atom.io/t/no-more-coffee-decaffeinate-the-atoms-core-atom-without-coffeescript/51092

I recommend that this package be transferred from coffeescript to ES6 for ease of maintenance and ease of development.
There are already mature tools that automatically help with the conversion: https://github.com/decaffeinate/decaffeinate

This is my some suggestion. I hope you can agree with me. Or I had to fork this repository and complete the conversion myself. Thank you.