node.js - NPM 需要一个对等点，但所有对等点都在 package.json 和 node_modules 中

Question

我面临安装时 npm 所说的问题

npm WARN eslint-config-react-app@2.0.1 requires a peer of babel-eslint@^7.2.3 but none was installed.
npm WARN eslint-config-react-app@2.0.1 requires a peer of eslint-plugin-jsx-a11y@^5.1.1 but none was installed.
npm WARN semantic-ui-react@0.74.2 requires a peer of react@>=0.14.0 <= 15 but none was installed.
npm WARN semantic-ui-react@0.74.2 requires a peer of react-dom@>=0.14.0 <= 15 but none was installed.

我认为非常奇怪的是，我的 package.json 中实际上有这些依赖项，并且还在 node_modules 文件夹中看到它们。

我的package.json:

{
  "name": "react-box",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "autoprefixer": "7.1.4",
    "babel-core": "6.26.0",
    "babel-eslint": "^8.0.1",
    "babel-jest": "21.2.0",
    "babel-loader": "7.1.2",
    "babel-preset-react-app": "^3.0.3",
    "case-sensitive-paths-webpack-plugin": "2.1.1",
    "chalk": "2.1.0",
    "connect-history-api-fallback": "1.3.0",
    "cross-spawn": "5.1.0",
    "css-loader": "0.28.7",
    "detect-port": "1.2.1",
    "dotenv": "4.0.0",
    "eslint": "4.8.0",
    "eslint-config-react-app": "^2.0.1",
    "eslint-loader": "1.9.0",
    "eslint-plugin-flowtype": "2.38.0",
    "eslint-plugin-import": "2.7.0",
    "eslint-plugin-jsx-a11y": "^6.0.2",
    "eslint-plugin-react": "7.4.0",
    "extract-text-webpack-plugin": "3.0.1",
    "file-loader": "1.1.5",
    "filesize": "3.5.10",
    "fs-extra": "4.0.2",
    "gzip-size": "4.0.0",
    "html-webpack-plugin": "2.30.1",
    "http-proxy-middleware": "0.17.4",
    "jest": "21.2.1",
    "json-loader": "0.5.7",
    "object-assign": "4.1.1",
    "path-exists": "3.0.0",
    "postcss-loader": "2.0.6",
    "promise": "8.0.1",
    "react-dev-utils": "^4.1.0",
    "recursive-readdir": "2.2.1",
    "strip-ansi": "4.0.0",
    "style-loader": "0.19.0",
    "truffle-contract": "^3.0.0",
    "truffle-solidity-loader": "0.0.8",
    "url-loader": "0.6.2",
    "webpack": "3.6.0",
    "webpack-dev-server": "2.9.1",
    "webpack-manifest-plugin": "1.3.2",
    "whatwg-fetch": "2.0.3"
  },
  "dependencies": {
    "axios": "^0.16.2",
    "babel-eslint": "^8.0.1",
    "dotenv": "^2.0.0",
    "react": "^16.0.0",
    "react-countup": "^2.2.0",
    "react-dom": "^16.0.0",
    "semantic-ui-react": "^0.74.2"
  },
  "scripts": {
    "start": "node scripts/start.js",
    "build": "node scripts/build.js",
    "test": "node scripts/test.js --env=jsdom"
  },
  "jest": {
    "collectCoverageFrom": [
      "src/**/*.{js,jsx}"
    ],
    "setupFiles": [
      "<rootDir>/config/polyfills.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.js?(x)",
      "<rootDir>/src/**/?(*.)(spec|test).js?(x)"
    ],
    "testEnvironment": "node",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.(js|jsx)$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web"
    },
    "moduleFileExtensions": [
      "web.js",
      "js",
      "json",
      "web.jsx",
      "jsx"
    ]
  },
  "babel": {
    "presets": [
      "react-app"
    ]
  },
  "eslintConfig": {
    "extends": "react-app"
  }
}

当尝试像这样手动安装这些对等点时:

npm install babel-eslint --save-dev

我仍然收到错误:

├── UNMET PEER DEPENDENCY babel-eslint@8.0.1
├── UNMET PEER DEPENDENCY eslint-plugin-jsx-a11y@6.0.2
├── UNMET PEER DEPENDENCY react@16.0.0
└── UNMET PEER DEPENDENCY react-dom@16.0.0

也许我不明白 NPM 是如何工作的，但据我了解，手动安装至少应该可以解决它，对吗？

如果有人需要更多信息，请发表评论，我将提供附加信息。谢谢!

Answer 1

关于peerDeps版本不匹配的NPM警告在这里是正确的。这些软件包已安装，但您拥有的某些其他软件包不支持已安装的版本。

就您而言 - 它们太新了，这意味着警告包的维护者尚未更新到这些版本。并将所需的peerDeps版本限制在API兼容范围内(没有破坏/主要版本飞跃)。

eslint-config-react-app@2.0.1 需要对等 deps:babel-eslint@^7.2.3(即 7.x.x)和 eslint-plugin-jsx-a11y@^5.1.1(即 5.x.x)。

您的版本是 "babel-eslint": "^8.0.1" 和 "eslint-plugin-jsx-a11y": "^6.0.2"。第一个数字 - 主要 - 不匹配。这就是 ^(插入符号)标记的含义。

与semantic-ui-react相同 - 他们还不支持react@16(🤗我也等不及了!)。

在此之前，您可以安装具有确切主要版本的软件包:

> npm view babel-eslint@7.* version // list released versions in required range 7.x.x
babel-eslint@7.0.0 '7.0.0'
babel-eslint@7.1.0 '7.1.0'
babel-eslint@7.1.1 '7.1.1'
babel-eslint@7.2.0 '7.2.0'
babel-eslint@7.2.1 '7.2.1'
babel-eslint@7.2.2 '7.2.2'
babel-eslint@7.2.3 '7.2.3'
> npm install --save-dev babel-eslint@7.2.3 // install latest version in required range

与其他包相同。

PS:另外，在 package.json 中，您必须删除重复的记录:dependency 中的 babel-eslint 和 dotenv，因为它们已经在 devDependency 中声明。