As mentioned in issue #1387 the @babel/plugin-proposal-private-methods is deprecated. In the issue however, it is solved by adding it, which was a different issue entirely (namely that it wasn't added and gave typescript issues).

So can it be replaced by the finalized package or is there something holding back the migration?
https://babeljs.io/docs/babel-plugin-transform-private-methods

Similarly vis gives an error about using visjs as well: vis@4.21.0-EOL: Please consider using https://github.com/visjs. Is there any chance of that migration too? It doesn't look like its a massively different module, though it is handled a bit differently.