问题
I am trying to install react-bootstrap. When I run the command
npm install react-bootstrap --save
I get the following (some path names replaced with '...') :
npm WARN saveError ENOENT: no such file or directory, open '/Users/../package.json'/Users/.../..
├── UNMET PEER DEPENDENCY react@>=0.14.0
├─┬ react-bootstrap@0.30.7
│ ├─┬ babel-runtime@6.20.0
│ │ ├── core-js@2.4.1
│ │ └── regenerator-runtime@0.10.1
│ ├── classnames@2.2.5
│ ├── dom-helpers@2.4.0
│ ├─┬ invariant@2.2.2
│ │ └─┬ loose-envify@1.3.0
│ │ └── js-tokens@2.0.0
│ ├── keycode@2.1.8
│ ├── UNMET PEER DEPENDENCY react@>=0.14.0
│ ├── UNMET PEER DEPENDENCY react-dom@>=0.14.0
│ ├─┬ react-overlays@0.6.10
│ │ └── UNMET PEER DEPENDENCY react@>=0.14.0
│ ├── react-prop-types@0.4.0
│ ├── uncontrollable@4.0.3
│ └── warning@3.0.0
└── UNMET PEER DEPENDENCY react-dom@>=0.14.0
npm WARN enoent ENOENT: no such file or directory, open '/Users/../../package.json'
npm WARN react-bootstrap@0.30.7 requires a peer of react@>=0.14.0 but none was installed.
npm WARN react-bootstrap@0.30.7 requires a peer of react-dom@>=0.14.0 but none was installed.
npm WARN react-overlays@0.6.10 requires a peer of react@>=0.14.0 but none was installed.
npm WARN react-overlays@0.6.10 requires a peer of react-dom@>=0.14.0 but none was installed.
npm WARN uncontrollable@4.0.3 requires a peer of react@>=0.11.0 but none was installed.
npm WARN react-prop-types@0.4.0 requires a peer of react@>=0.14.0 but none was installed.
Do I need to install React before I install react-bootstrap? I don't see any specific mention of it in the doc. (I am new to React and didn't even know that I need React also if I am using react-bootstrap. I thought it included React as well. But saw this mentioned in the Javascript section of the same doc later: "If you have React setup and React-Bootstrap installed you have everything you need.")
回答1:
In the React ecosystem, you should always install react + react-dom first. Don't rely on peer dependencies in general.
回答2:
Yes you will need to install react and react-dom separately. A peer dependency is one that the package you're installing assumes to already be installed.
The behaviour changed in npm 3 to simply warn of those that are missing.
npm install react react-dom react-bootstrap --save
来源：https://stackoverflow.com/questions/41299783/do-i-need-to-install-react-before-i-install-react-bootstrap