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Interesting. I was attempting to compile some bundles over the weekend and was noticing drastically larger chunk sizes. I realized this was because I had neglected to specify NODE_ENV=production, and my babel-loader was using my dev config (which leaves prop-types in the code). Based on your comment, and the above docs, I shouldn't be seeing what I'm seeing.

Are you using webpack 3? That change happened in February with webpack 4:


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