As an additional point - the current package file will work, but dependencies might not be correctly resolved - this was how I first realised that they'd deprecated that format.

We should keep package.json file too.
It is necessary for npm installation for example for browserify.

Agreed; I think from a point of view of commits we should commit package.json -> bower.json and then add a new package.json to handle npm.

(Though supporting Browserify would require some extra work with the exports model too)

Done!

Thanks!

(Though supporting Browserify would require some extra work with the exports model too)

Yes, but I have no enough time now=(

Yeah, I was hacking away last night to try and make a generic compiler that would expose items for browserify, but not sure it's always feasible with big packages like this.