Circular dependencies using jwt and webpack

util causes circular dependencies when using the JWT npm module and webpack.

Check out this webpack issue for details:

https://github.com/webpack/webpack/issues/1019

Start with the reported JWT npm module and webpack combination, then read webpack issue #1019 for the dependency-cycle details. No project file or test is named, so first locate the dependency path involved; done means the circular dependency no longer occurs in this webpack scenario.

Written by the indexing model from the issue text.