Getting ValidationError for mix phx.server

Questions / Help
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#1

When I try to run mix phx.server I am getting this error…

[webpack-cli] ValidationError: Invalid options object. Copy Plugin has been initialized using an options object that does not match the API schema.
 - options[0] misses the property 'patterns'. Should be:
   [non-empty string | object { from, to?, context?, globOptions?, filter?, toType?, force?, info?, transform?, transformPath?, noErrorOnMissing? }, ...] (should not have fewer than 1 item)

Can anyone please help me with this?

“webpack”: “^5.23.0”,
“webpack-cli”: “^4.5.0”
npm -v 6.14.11

#2

It’s in the webpack.config.js. The configuration of Copy webpack plugin has changed recently.

Please show the relevant part of your webpack config file…

#3

my assets/webpack.config.js looks like this

const path = require('path');
const glob = require('glob');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const webpack = require('webpack');

module.exports = (env, options) => ({
  optimization: {
    minimizer: [
      new UglifyJsPlugin({ cache: true, parallel: true, sourceMap: false }),
      new OptimizeCSSAssetsPlugin({})
    ]
  },
  entry: {
      './js/app.js': ['./js/app.js'].concat(glob.sync('./vendor/**/*.js'))
  },
  output: {
    filename: 'app.js',
    path: path.resolve(__dirname, '../priv/static/js')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader']
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({ filename: '../css/app.css' }),
    new CopyWebpackPlugin([{ from: 'static/', to: '../' }]),
     new webpack.ProvidePlugin({
         $: "jquery",
         jQuery: "jquery"
       })
  ]
});
#4

It should be…

      new CopyWebpackPlugin({
        patterns: [{ from: "static/", to: "../" }]
      }),
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