Grapher Live not working

[Herteby]

I was going to use this package as a base to test GraphicalGrapherReact, but it's not working.
I haven't made any changes, just cloned it and ran npm install, which ran fine.
The home page works, although it throws Uncaught Error: Cannot find module 'brace'
When I go to Grapher Live I get

Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in.

Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in.

[suttersaga]

So I think it's just missing some packages...
npm install classnames --save
npm install brace

seems to make it work.