webpack not honoring swiper modules: how to?

[stratboy]

Hi, I'm doing some tests, my index.js is just this:

import Swiper, { Navigation, Pagination } from 'swiper';
console.log(Swiper);

And this is my webpack config:

const path = require('path');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  //mode: 'development',
  mode: 'production',
  watch: true,
  entry: {
    index: './src/index.js',

  },

  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist'),
    clean: true,
  },


  plugins: [
    new BundleAnalyzerPlugin()
  ],

  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: { presets: ['@babel/preset-env'] }
        }
      } // babel
    ] // rules
  } // module
};

Well, the BundleAnalyzer graph shows that ALL the swiper modules are bundled. Why? How can I avoid that?

[stratboy]

I just realised that swiper.esm.js exports pretty everything, not only Swiper. So docs are wrong, I guess. They state:

By default Swiper exports only core version without additional modules (like Navigation, Pagination, etc.)

https://swiperjs.com/get-started

Instead:

export { default as Swiper, default } from './core/core.js';
export { default as Virtual } from './modules/virtual/virtual.js';
export { default as Keyboard } from './modules/keyboard/keyboard.js';
export { default as Mousewheel } from './modules/mousewheel/mousewheel.js';
export { default as Navigation } from './modules/navigation/navigation.js';
export { default as Pagination } from './modules/pagination/pagination.js';
export { default as Scrollbar } from './modules/scrollbar/scrollbar.js';
export { default as Parallax } from './modules/parallax/parallax.js';
export { default as Zoom } from './modules/zoom/zoom.js';
export { default as Lazy } from './modules/lazy/lazy.js';
export { default as Controller } from './modules/controller/controller.js';
export { default as A11y } from './modules/a11y/a11y.js';
export { default as History } from './modules/history/history.js';
export { default as HashNavigation } from './modules/hash-navigation/hash-navigation.js';
export { default as Autoplay } from './modules/autoplay/autoplay.js';
export { default as Thumbs } from './modules/thumbs/thumbs.js';
export { default as FreeMode } from './modules/free-mode/free-mode.js';
export { default as Grid } from './modules/grid/grid.js';
export { default as Manipulation } from './modules/manipulation/manipulation.js';
export { default as EffectFade } from './modules/effect-fade/effect-fade.js';
export { default as EffectCube } from './modules/effect-cube/effect-cube.js';
export { default as EffectFlip } from './modules/effect-flip/effect-flip.js';
export { default as EffectCoverflow } from './modules/effect-coverflow/effect-coverflow.js';
export { default as EffectCreative } from './modules/effect-creative/effect-creative.js';
export { default as EffectCards } from './modules/effect-cards/effect-cards.js';

[oguilleux]

@nolimits4web solution might be above.

[stratboy]

Solution was this:

  module: {
    rules: [
      {
        test: /swiper\.esm\.js/,
        sideEffects: false
      }, //tree shaking
    ] // rules
  }, // module

[oguilleux]

Thank you @stratboy ! This solved my problem !

Stackoverflow link for more details : https://stackoverflow.com/questions/71031894/why-isnt-webpack-tree-shaking-swiperjs-modules