isabella232 / wp-scripts-webpack-clean-bug

Demo of the https://github.com/WordPress/gutenberg/issues/35980

This repository demonstrates the issue with the CleanWebpackPlugin webpack plugin removing build output in multi-process webpack configurations such as webpack.config.js.

See this GitHub action run that shows that the js/dist/modern output directory is empty after the build:

$ find js/dist
js/dist
js/dist/legacy
js/dist/legacy/legacy.js
js/dist/legacy/legacy.asset.php
js/dist/modern

even though webpack built both:

$ npm run build

> wp-scripts-webpack-clean-bug@ build /home/runner/work/wp-scripts-webpack-clean-bug/wp-scripts-webpack-clean-bug
> wp-scripts build

asset legacy.js 9.01 KiB [emitted] [minimized] (name: legacy)
asset legacy.asset.php 95 bytes [emitted] (name: legacy)
Entrypoint legacy 9.1 KiB = legacy.js 9.01 KiB legacy.asset.php 95 bytes
orphan modules 16.3 KiB [orphan] 1 module
./js/src/legacy.js + 1 modules 16.3 KiB [built] [code generated]
./js/src/modern.js 101 bytes [built] [code generated]
webpack 5.60.0 compiled successfully in 1139 ms

asset modern.asset.php 95 bytes [emitted] (name: modern)
asset modern.js 78 bytes [emitted] [minimized] (name: modern)
Entrypoint modern 173 bytes = modern.js 78 bytes modern.asset.php 95 bytes
./js/src/modern.js 101 bytes [built] [code generated]
webpack 5.60.0 compiled successfully in 696 ms