Webpack v5 toJson namedChunkGroups

index.js

/**
 * Demonstrates the different between Webpack v4 and Webpack v5 toJson behaviour
 **/

const webpack = require("webpack");

const compiler = webpack({});

compiler.run((err, res) => {
  if (err) {
    console.log({ err });
    throw err;
  }
  const stats = res.toJson();
  /**
   * Webpack 4
   * stats.namedChunkGroups = { main:
   * { chunks: [ 0 ],
   *    assets: [ 'main.js' ],
   *    children: [Object: null prototype] {},
   *    childAssets: [Object: null prototype] {},
   *    isOverSizeLimit: undefined } }
   **/
   /**
    * Webpack 5
    * stats.namedChunkGroups = [Object: null prototype] {}
    **/
  console.log("stats.namedChunkGroups", stats.namedChunkGroups);
  if (!stats.namedChunkGroups.main) {
    throw new Error("main not found in namedChunkGroups");
  }
});