Error: PostCSS plugin autoprefixer requires PostCSS 8. Update PostCSS or downgrade this plugin

Question

I am getting this error whenever I run npm start. I tried a couple of fixes but none of them work for me. I tried to change the version of autoprefixer to 9.8.6 but it didn\'t w

Answer 1

Based on documentation link are drop some support for old NodeJS and you must upgrade manually the packages. Example in my case for a project based on webpack need just to update those dependencies:

  "dependencies": {
    "autoprefixer": "^10.0.2",
    "postcss": "^8.1.7",
    "postcss-loader": "^4.0.4"
  }

So you do not need to downgrade autoprefixer :)