This `node_modules` folder is not generated by a package manager.
It is manually created, to use node's resolution algorithms in fixture options
to resolve providers defined in this monorepo.

e.g. "@@/babel-plugin-polyfill-regeneretor" instead of
"../../../../../babel-plugin-polyfill-regeneretor"

Ref: https://twitter.com/Rich_Harris/status/1139908960520220677
