为什么npm不从package.json安装react？

Question

如果我删除我的node_modules并在我的ReactNative项目中执行一次干净的npm安装，我得到警告"react-native@0.37.0需要一个react@~15.3.1的对等体，但没有安装。“但是，我在package.json文件中将react列为依赖项：

{
  "name": "MyApp",
  "version": "1.1.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start"
  },  
  "dependencies": {
    "lodash": "^4.17.2",
    "moment": "^2.16.0",
    "react": "^15.3.1",
    "react-native": "^0.37.0",
    "react-native-drawer": "^2.2.6",
    "react-native-htmlview": "^0.5.0",
    "react-native-keyboard-spacer": "^0.3.0",
    "react-native-material-design": "^0.3.7",
    "react-native-modal-picker": "0.0.16",
    "react-native-modalbox": "^1.3.4",
    "react-native-vector-icons": "^3.0.0",
    "react-native-viewpager": "^0.2.13",
    "rebound": "0.0.13"
  }
}

Answer 1

您的react依赖项版本为^15.3.1。semver中的插入字符^允许在version major.minor.patch的次要范围内的任何版本。NPM目前将其解析为15.4.2。

另一方面，React Native中的react对等依赖项是~15.3.1。波浪号字符~只允许在补丁版本中变化，所以它与15.4.2不兼容。

将您的react依赖项定义为~15.3.1，您将获得正确的版本。