Yes, this is the ancient Bootstrap 2.3.2 taken from https://www.npmjs.com/package/bootstrap-2.3.2.
While that 1.0.0 release contains the vanilla version, versions 2.0.0 and greater add some improvements:
- jQuery 3 compatibility
To mitigate the »Couldn't find preset "env" relative to directory« error
after linking this into other projects,
we had to run yarn add --dev babel-preset-env here, see also
babel/babel-preset-env#186 (comment)