The version of this in normalize-package-data emits a warning for conflicts with core modules

[iarna]

Specifically:

 if (coreModuleNames.indexOf(data.name) !== -1)
      this.warn("conflictingName", data.name)

Using this list.

I'm not saying we should warn here, but I'd like to have that discussion.

[othiym23]

We definitely want to warn on this. There are valid use cases for overriding core modules (particularly when polyfilling stuff from Node for browserify pipelines – I know @feross, among others, leans on this pretty hard), but in general, leaning on a builtin is a mistake because it will be completely ignored by Node's module loader (as mentioned elsewhere).

[feross]

Wrote my thoughts on this here: #2 (comment)

[zeke]

https://www.npmjs.com/package/validate-npm-package-name 2.0 landed a few months back, with support for checking against core modules.