Error: webpack.optimize.UglifyJsPlugin has been removed, please use config.optimization.minimize instead.

[xeroneon]

when i try to go live on heroku i get this error, unfortunately i dont know much about webpack yet so i have no clue how to resolve this issue

[frankthoeny]

I fixed mine. This message is caused by the updated version of UglifyJS. They removed that function. Install this package here. https://github.com/webpack-contrib/uglifyjs-webpack-plugin Replace the old block of code Open config/webpack.prod.js [top] ... const UglifyJsPlugin = require("uglifyjs-3-webpack-plugin"); ...

plugins: [ new UglifyJsPlugin({ uglifyOptions: { warnings: false, ie8: false, output: { comments: false } } }) ]

[PrathamDogra]

Any update on this?

[dajanvulaj]

@PrathamDogra

Optimization Since version 4 webpack runs optimizations for you depending on the chosen mode, still all optimizations are available for manual configuration and overrides.

To fix this:

module.exports = {
  optimization: {
    minimize: false //Update this to true or false
  }
};