我是npm的新手，并不真正理解依赖项与开发依赖项之间的关系。我知道对于测试库，他们应该进入dev，但是对于像babel和WebPack这样的东西呢？因为它们只用于将es6和JSX转换成普通JS，所以它们也应该在dev中吗？我的理解是，当您部署到heroku时，heroku已经对必要的库进行了传输编译，因此没有必要在生产中托管它们？
"dependencies": {
"babel-core": "^6.7.7",
"babel-eslint": "^6.0.4",
"babel-loader": "^6.2.4",
"babel-plugin-react-transform": "^2.0.2",
"babel-plugin-transform-object-rest-spread": "^6.6.5",
"babel-plugin-transform-react-display-name": "^6.5.0",
"babel-polyfill": "^6.7.4",
"babel-preset-es2015": "^6.6.0",
"babel-preset-react": "^6.5.0",
"bootstrap": "^3.3.7",
"css-loader": "^0.23.1",
"es6-promise": "^3.2.1",
"eslint": "^2.9.0",
"eslint-plugin-babel": "^3.2.0",
"eslint-plugin-react": "^5.0.1",
"express": "^4.13.4",
"extract-text-webpack-plugin": "^1.0.1",
"file-loader": "^0.9.0",
"lodash": "^4.15.0",
"react": "^15.0.2",
"react-addons-css-transition-group": "^15.0.2",
"react-dom": "^15.0.2",
"react-redux": "^4.4.5",
"react-transform-catch-errors": "^1.0.2",
"react-transform-hmr": "^1.0.4",
"redbox-react": "^1.2.3",
"redux": "^3.5.2",
"redux-form": "^6.1.0",
"rimraf": "^2.5.2",
"style-loader": "^0.13.1",
"webpack-dev-middleware": "^1.6.1",
"webpack-hot-middleware": "^2.10.0"
},
"devDependencies": {
"babel-register": "^6.9.0",
"chai": "^3.5.0",
"mocha": "^2.5.3",
"sinon": "^1.17.4",
"webpack": "^1.13.2"
}
babel和webpack包将进入devdependencies部分，因为当将代码转换并捆绑到bundle.js&etc文件。
在生产中，您将从bundle.js中运行代码，构建/生成的代码将不再需要这些依赖项。
不管大家怎么说，我还是要给大家一个理智的解释。。。其实很简单:
您的项目是否将被另一个项目NPM安装？你是否在创作一个npm模块？它会在另一个项目package.json中结束吗？
没有？
然后将所有内容放在dependencies中。
是的？
依赖项:希望项目的下游使用者和项目开发人员安装的内容:PeerDependencies:下游用户需要确保已安装的东西BundleDependencies:下游用户需要的东西，不需要单独安装，因为当您NPM发布时，这些东西将与您的包“捆绑”在一起。OptionalDependencies:拥有的东西很好，但缺少不会导致致命错误DevDependencies:仅在处理项目时使用的东西。它的缺点是:模块不会神奇地以不同的方式安装。它们要么安装要么不安装。
DevDependency是只用于开发服务器的，这些是DevDependency:源代码中没有使用的包或导入的包都是DevDependency
"babel-cli": "^6.26.0",
"babel-core": "^6.26.0",
"babel-loader": "^7.1.4",
"babel-preset-env": "^1.6.1",
"babel-preset-react": "^6.24.1",
"clean-webpack-plugin": "^0.1.19",
"copy-webpack-plugin": "^4.5.1",
"css-loader": "^0.28.11",
"file-loader": "^1.1.11",
"html-webpack-plugin": "^3.2.0",
"mini-css-extract-plugin": "^0.4.0",
"node-sass": "^4.8.3",
"optimize-css-assets-webpack-plugin": "^4.0.0",
"prop-types": "^15.6.1",
"sass-loader": "^7.0.1",
"style-loader": "^0.21.0",
"uglifyjs-webpack-plugin": "^1.2.5",
"webpack": "^4.6.0",
"webpack-cli": "^3.1.1",
"webpack-dev-server": "^3.1.9"
