@bvaughn I think it was published by you. I see paths such as `/Users/bvaughn/Documents/git/react.devtools` in the bundle's comments. v4.16.0 weighs under 8MB. v4.17.0 weighs over 400MB and contains many dev-time bundles with source maps. See https://www.npmjs.com/package/react-devtools-inline ("Unpacked Size: 426MB") Or install locally to reproduce.