create-react-app install devDepencies in dependencies section

After creating a new project with create-react-app and running yarn eject.

The dependencies section of my package.json looks like this:

  "dependencies": {
    "autoprefixer": "7.1.1",
    "babel-core": "6.25.0",
    "babel-eslint": "7.2.3",
    "babel-jest": "20.0.3",
    "babel-loader": "7.0.0",
    "babel-preset-react-app": "^3.0.1",
    "babel-runtime": "6.23.0",
    etc.

I would say these are all devDependencies why has create-react-app placed them here?