Use the polyfill version of u2f API provided by Google.
https://github.com/mastahyeti/u2f-api
This polyfill is at least compatible with Chrome and
Firefox after enabling the U2F support.
[HOWTO] Enable U2F in Firefox >= 57:
Navigate to 'about:config' and search for 'u2f' option.
Double-click on the line to toggle the option.
The u2f-api package does not use the official u2f script provided by Yubikey.
Unfortunately, it was blocked by Firefox. This change reintroduces the
official u2f script.
Client and server now have their own tsconfig so that the transpilation is only
done on the part that is being modified.
It also allows faster transpilation since tests are now excluded from tsconfig.
They are compiled by ts-node during unit tests execution.
