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I tried some solutions on stackOverFlow and youTube about peerDependencies. One of them was add a peerDependency in package.json file. Following is my package.json file

{
  "name": "app",
  "version": "0.1.0",
  "private": true,
  "peerDependencies": {
    "react": "^17.0.0",
    "@babel/core": "^7.13.0",
    "react-dom": "^17.0.0",
    "typescript": "3.2.0-dev",
    "fsevents": "1.2.13"
  },
  "dependencies": {
    "@emotion/react": "^11.10.5",
    "@emotion/styled": "^11.10.5",
    "@mui/material": "^5.11.8",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-scripts": "3.2.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

After I did npm install, still I am getting this error "WARN @mui/material@5.11.8 requires a peer of react@^17.0.0 || ^18.0.0 but none is installed. You must install peer dependencies yourself." My questions are :

  1. How to install peer dependency by yourself means ? I have already added it to package.json. How to add it when there is already react 16.12 running ?
  2. I don't want to use mui version 4, Isn't there other ways to club react 16.12 and Material UI 5 ?
PVD
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  • I also tried npm install @mui/material @emotion/react @emotion/styled --legacy-peer-deps, still getting the same warning. – PVD Feb 12 '23 at 07:34

1 Answers1

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  1. How to install peer dependency by yourself means ? I have already added it to package.json. How to add it when there is already react 16.12 running ?

A peer dependency specifies that our package is compatible with a particular version of an npm package.
peerDependencies are not automatically installed. You need to manually modify your package.json file in order to add a Peer Dependency.

Source: Difference between dependencies, devDependencies and peerDependencies

Using --legacy-peer-deps will usually allow you to install the package without meeting the peer dependency requirements. If that doesn't work, --force will install without regard to peer dependencies.

Source: How can I make npm install package and ignore one (or all) peer dependencies?

So, You can do:

npm install @mui/material@5 --legacy-peer-deps

Or

npm install @mui/material@5 --force
  1. I don't want to use mui version 4, Isn't there other ways to club react 16.12 and Material UI 5 ?

No, You have to upgrade React version, or just ignore the peer dependency requirements warning.

Amr Eraky
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  • Thank you @Amr Eraky, you said, 'You need to manually modify your package.json file in order to add a Peer Dependency' , in my above package.json how to add react@17.0.0 as a peerDependency while my project is already running on react@16.12 ? – PVD Feb 12 '23 at 08:07
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    `package.json` here means `package.json` of the package (in case you create your own package) https://stackoverflow.com/a/68932368/13346156 . not for your app – Amr Eraky Feb 12 '23 at 08:34
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    If you open `\node_modules\@mui\material\package.json` for @mui/material v5, you'll find `"peerDependencies": { "@types/react": "^17.0.0 || ^18.0.0", },`, This means you can't install it without React 17 or 18, or ignore peer Dependencies – Amr Eraky Feb 12 '23 at 08:37