When reading from webpack5 filesystem cache imported assets from css are not found

[piecyk]

• Operating System: macOS
• Node Version: 12.14.1
• NPM Version: 6.13.4
• webpack Version: 5.4.0
• mini-css-extract-plugin Version: 1.3.0

Expected Behavior

When webpack is running from cache, output is the same as without.

Actual Behavior

When reading from cache assets imported from css are not found.

Code

https://github.com/piecyk/mini-css-extract-plugin-asset-cache-bug

How Do We Reproduce?

1. checkout mini-css-extract-plugin-asset-cache-bug
2. yarn webpack
3. checkout output from ./dist

./dist/
├── index.html
├── main.css
├── main.js
└── static
    └── webpack-logo.svg

4. rm -rf ./dist/
5. yarn webpack
6. checkout output from ./dist

./dist/
├── index.html
├── main.css
└── main.js

[alexander-akait]

Yep, bug, mini-css-extract-plugin doesn't work with asset modules, critical, need to fix

[piecyk]

Hmm hard to say where or how to start with this 🤔 Obvious workaround is to use file-loader/url-loader rather new assets. Also if someone want's to have a look added testes cases https://github.com/piecyk/mini-css-extract-plugin/tree/bugfix/655 can use this as base branch.

[alexander-akait]

I will send a fix today

[alexander-akait]

Hope, we don't break anything, anyway there is one way to check, release it 😄

[alexander-akait]

Please try https://github.com/webpack-contrib/mini-css-extract-plugin/releases/tag/v1.3.1

[piecyk]

@evilebottnawi works! Thanks 👏

[Varedis]

This seems to have broken Webpack 4 compatibility.

v1.3.0 works with Webpack 4
v1.3.1 does not

[alexander-akait]

@Varedis when you speak it is broken please provide reproducible test repo, hard to say what is not working

[alexander-akait]

We have tests for v4 and all works fine, hard-source-webpack-plugin will be never compatibility with this

[Varedis]

Maybe this helps, I don't really have the time to make a test repo at the minute, sorry:

using mini-css-extract-plugin@1.3.1 and webpack@4.29.6:

Using mini-css-extract-plugin@1.3.0 with the same webpack version and exactly same config works fine.