How to get a list of all files (or modules) included per chunk in Webpack

Question

Can't seem to find any debug option or plugin in webpack to show what exactly went into a chunk.

Why do I need this? I've noticed cases where code splitting literally makes everything much larger then just sticking everything in a single file. This is a bit counter intuitive since I don't believe the bootstrap code from webpack is that significant; I suspect it might be minification/deduping, but with out knowing which modules are actually being chunked togheter it's very hard to do some isolated tests to confirm.

My build process uses gulp; if that makes any difference.

Answer 1

Webpack 5.x:

$ webpack --stats-modules-space 999 

Before Webpack 5.x:

It seems that it has the parameter called --display-modules to show all the modules as follows:

$ webpack --display-modules 

Then you will get the list of used modules similar the following:

                   Asset     Size  Chunks             Chunk Names javascripts/webpack/app.js   211 kB       0  [emitted]  javascripts/webpack/app stylesheets/webpack/app.js  4.13 kB       1  [emitted]    stylesheets/webpack/app stylesheets/webpack/app.scss  2.99 kB       1  [emitted]  stylesheets/webpack/app [0] ./app/webpack/js/behaviors/lory-icon-slider.js.coffee 1.1 kB {0} [optional] [built] [1] ./app/webpack/css/components (\.scss|\.css)$ 160 bytes {1} [built] [2] ./app/webpack/js/behaviors (\.js|\.js.jsx|\.js.coffee)$ 252 bytes {0} [built] [3] ./~/pickmeup/css/pickmeup.scss 41 bytes {1} [built] [4] ./app/webpack/css/app.js 205 bytes {1} [built] [5] ./app/webpack/js/app.js 250 bytes {0} [built] [6] ./app/webpack/js/behaviors/pickmeup-fixed-calendar.js 3.47 kB {0} [optional] [built] [7] ./~/lory.js/dist/jquery.lory.js 25 kB {0} [built] [8] ./~/pickmeup/js/pickmeup.js 41.4 kB {0} [built] [9] (webpack)/buildin/global.js 509 bytes {0} [built] Child extract-text-webpack-plugin:    [0] ./~/css-loader/lib/css-base.js 1.51 kB {0} [built]    [1] ./~/css-loader!./~/sass-loader/lib/loader.js!./~/pickmeup/css/pickmeup.scss 3.23 kB {0} [built]