I used node-config for far too long before I discovered https://github.com/node-config/node-config/wiki/Reserved-Words

I even issued a PR (#705) meant to override it.

I ended up writing my own linter for the config/directory that checked for things like this. A utility method callable by users to do the same would be quite handy to have. Perhaps even a CLI to check things like this.

Part of the failure mode here is that because of the way setImmutable and defineProperty works, there's a silent failure mode when the definition collision happens. For certain combination of property attributes, further attempts to modify the object simply become a no-op, with no exception. The changes I made in #705 were meant to address that but I now think in the wrong direction.

There may be a few lines of that PR that still should be brought forward, as IMO there are two bugs there.