Customize Angular Webpack config

add customWebpackConfig to angular.json

{
    "projects": {
        "architect": {
            "build": {
                "options": {
                  "customWebpackConfig": {
          "path": "./custom-webpack.config.js",
          "replaceDuplicatePlugins": true
        },
                }
            }
        }
    }
}

add the extra webpack plugin config in the custom-webpack.config.js

module.exports = {
    module: {
        rules: [
            {
                test: /\.js$/,
                loader: 'babel-loader',
                query: {
                    presets: ['@babel/preset-env'
                    ]
                }
            }
        ]
    }
}