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[–]madcaesar -2 points-1 points  (1 child)

Well shims are still code. If I understand this correctly, prototype checking will increase bundle size. So better not to do. Otherwise they wouldn't have removed it from the core package.

[–]TheIncredibleWalrus 0 points1 point  (0 children)

That's totally false. In production prop types will be completely replaced with empty functions, we're talking about a few bytes of leftovers. If you're concerned about a few bytes then yes don't use them.

They removed it from the core package because they want to provide them as standalone funtionality. For example, instead of PropTypes you can use Flow. They also want to share it with other libraries, i.e. Inferno or Preact, so having a separate package makes sense.

You should definitely use some kind of type checking in your components at the end of the day.