Error: [object Object] is not a PostCSS plugin

See original GitHub issue

I just happened to setup a new workstation, installed some tools to process SASS files and called something like npm i -g node-sass postcss postcss-cli clean-css-cli autoprefixer browserslist on the command line. I tried to prefix a css files using a statement like postcss expanded.css -u autoprefixer -o prefixed.css --no-map and got error Error: [object Object] is not a PostCSS plugin I downgraded to autoprefixer@9 and the error went away. I see version 10 had just been pushed. Is there an issue?

Issue Analytics

State:
Created 3 years ago
Reactions:18
Comments:27 (9 by maintainers)

Top GitHub Comments

36reactions

mwmcodecommented, Sep 16, 2020

had Error: true is not a PostCSS plugin after upgrading to v10.

Then I read the changelog which mentions postcss being moved to peerDep

so I npm i postcssed and it went away

10reactions

evanleckcommented, Sep 15, 2020

Same here:

TypeError: Invalid PostCSS Plugin found at: plugins[0]

(@/home/evan/Code/prepaid/web/postcss.config.js)
    at /home/evan/Code/prepaid/web/node_modules/.pnpm/postcss-load-config@2.1.0/node_modules/postcss-load-config/src/plugins.js:72:15
    at Array.forEach (<anonymous>)
    at plugins (/home/evan/Code/prepaid/web/node_modules/.pnpm/postcss-load-config@2.1.0/node_modules/postcss-load-config/src/plugins.js:58:13)
    at processResult (/home/evan/Code/prepaid/web/node_modules/.pnpm/postcss-load-config@2.1.0/node_modules/postcss-load-config/src/index.js:33:14)
    at /home/evan/Code/prepaid/web/node_modules/.pnpm/postcss-load-config@2.1.0/node_modules/postcss-load-config/src/index.js:94:14
    at async Promise.all (index 0)

My postcss.config.js:

/* eslint-env node */
module.exports = {
  plugins: [
    require('autoprefixer'),
    require('cssnano')({
      preset: ['advanced', {
        autoprefixer: false,
        discardComments: {
          removeAll: true
        }
      }]
    })
  ]
}

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