How to include and use DefinePlugin in webpack config?

Question

Hi there i am trying to use the define plugin so i can update the version number to make sure my JS refreshes after releasing a new build. I can't seem to get DefinePlugin to work properly though. I see it in the folder webpack and i'm trying to follow the documentation but i get errors that it isn't found. Here is my config:

const path = require('path'),
settings = require('./settings');

const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const webpack = require('webpack');


module.exports = {
  entry: {
    'scrollerbundled': [settings.themeLocation + "js/scroller.js"],
    'mapbundled': [settings.themeLocation + "js/shopmap.js"],
    'sculptor': [settings.themeLocation + "js/sculptor.js"]
  },
  output: {
    path: path.resolve(__dirname, settings.themeLocation + "js-dist"),
    filename: "[name].js"
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ],
    plugins: [new webpack.DefinePlugin({
    PRODUCTION: JSON.stringify(true),
    VERSION: JSON.stringify('5fa3b9'),
  })]
  },
  optimization: {
    minimizer: [new UglifyJsPlugin({ 
            uglifyOptions: {
                mangle: true,
                output: {
                    comments: false
                }
            }
       })]
  },
  mode: 'production'
}

Answer 1

I Have "webpack": "^4.28.4" and define in webpack config

new webpack.DefinePlugin({
 PRODUCTION: JSON.stringify(true),
});

if you console that variables, you don't find it. I use in conditional

if (PRODUCTION) {
 //do stuff
}

Another case is to set globals variables in a object and share with webpack.

here is an example

        new webpack.ProvidePlugin({
        CONFIG: path.resolve(__dirname, './CONSTS.js')
        }),
        // the path is src/CONST.JS

In the eslintrc file you can add that variables to avoid import errors.

    "settings": {
     "import/resolver": {
      "webpack": {
       "config": "webpack.dev.js"
      }
     }
    }

then in any file you can use import {value} from 'CONFIG'