Wrong path for assets inside css files, when use subfolder for css files

[WebCimes]

Bug report

Actual Behavior

For begin I set a publicPath for my assets (ex fonts) :

test: /\.(eot|ttf|otf|woff|woff2)$/i,
    type: 'asset/resource',
    generator: {
        publicPath: '/dist/fonts/',
        outputPath: './fonts/',
    },

When I set no subfolder for my css files it's work fine :
new MiniCssExtractPlugin({filename: "[name].css"}),

And I got the right path in my css files :

@font-face
{
    font-family: 'Poppins';
    src: url(/dist/fonts/3bd71aafa4de4b4a8875.eot);
    src: url(/dist/fonts/3bd71aafa4de4b4a8875.eot?#iefix) format('embedded-opentype'),
        url(/dist/fonts/e9b88d1590baa248f3e2.woff2) format('woff2'),
        url(/dist/fonts/081fa188b65fb4393803.woff) format('woff'),
        url(/dist/fonts/5c210093630fe230c462.ttf) format('truetype');
    font-weight: 300;
    font-style: normal;
}

But now if I want to put my css files into a subfolder like css/myfiles.css :
new MiniCssExtractPlugin({filename: "css/[name].css"}),

I get wrong path in my css files :

@font-face
{
    font-family: 'Poppins';
    src: url(..//dist/fonts/3bd71aafa4de4b4a8875.eot);
    src: url(..//dist/fonts/3bd71aafa4de4b4a8875.eot?#iefix) format('embedded-opentype'),
        url(..//dist/fonts/e9b88d1590baa248f3e2.woff2) format('woff2'),
        url(..//dist/fonts/081fa188b65fb4393803.woff) format('woff'),
        url(..//dist/fonts/5c210093630fe230c462.ttf) format('truetype');
    font-weight: 300;
    font-style: normal;
}

Expected Behavior

When I use subfolder for my css files the path of my fonts inside my css files must be only /dist/fonts/, but actually ../ are added in addition.

Please paste the results of npx webpack-cli info here, and mention other relevant information

System:
OS: Linux 4.4 Debian GNU/Linux 10 (buster) 10 (buster)
CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
Memory: 8.02 GB / 15.89 GB
Binaries:
Node: 18.12.1 - ~/.nvm/versions/node/v18.12.1/bin/node
npm: 9.2.0 - ~/.nvm/versions/node/v18.12.1/bin/npm
Packages:
@webpack-cli/generators: ^3.0.1 => 3.0.1
babel-loader: ^9.1.0 => 9.1.0
copy-webpack-plugin: ^11.0.0 => 11.0.0
css-loader: ^6.7.3 => 6.7.3
html-webpack-plugin: ^5.5.0 => 5.5.0
style-loader: ^3.3.1 => 3.3.1
terser-webpack-plugin: ^5.3.6 => 5.3.6
webpack: ^5.75.0 => 5.75.0
webpack-cli: ^5.0.1 => 5.0.1
webpack-dev-server: ^4.11.1 => 4.11.1
webpack-manifest-plugin: ^5.0.0 => 5.0.0
workbox-webpack-plugin: ^6.5.4 => 6.5.4
Global Packages:
webpack-cli: 5.0.1
webpack: 5.75.0

Thanks

[alexander-akait]

Please creare repdocuible test repo, I think you have a problem with public path

[vetruvet]

I happen to have run into the same issue and put together a reproduction repo: https://github.com/vetruvet/mini-css-extract-public-path-bug

In digging into the issue, I've found some seemingly useful information (not enough for me to propose a fix though):

• When this plugin's loader runs importModule, it passes ABSOLUTE_PUBLIC_PATH (webpack:///mini-css-extract-plugin/) as the publicPath
• When the webpack asset module rule has a publicPath (that overrides the full output.publicPath), webpack's AssetGenerator will put that in the generated code instead of a publicPath + filename expression. This causes the ABSOLUTE_PUBLIC_PATH to not be used, and instead BASE_URI (webpack://)
• When this plugin then does replacement of the webpack:// URIs, it ends up trying to make a relative path from the CSS file to the asset using getUndoPath, but (at least in the reproduction repo) it ends up being ../ and then the asset rule's publicPath and file name get appended to that. In the case of the reproduction repo, it would need to be ../../.
• This only happens when the CSS file is output into a subfolder. Otherwise getUndoPath returns an empty string, and the asset rule's publicPath is not prepended with ../

I'm not sure where a proper fix would be, but hopefully that info at least helps.

@WebCimes as a workaround what I've done is make output.assetModuleFilename a function and not use the outputPath or publicPath options on the asset rule e.g.

assetModuleFilename: ({ filename }) => `${/\.(eot|ttf|otf|woff|woff2)$/i.test(filename) ? 'fonts/' : ''}[name][ext]`,

[WebCimes]

@vetruvet thanks for your reproduction repo and your great explanation of the problem, I hope someone could correct the bug. Also thanks for your workaround who works well, but finnaly I have also find another easy workaround (similary to yours), like you said I don't use outputPath or publicPath, and I add the subfolder for my asset directly inside the generator.filename :
{ test: /\.(eot|ttf|otf|woff|woff2)$/i, type: 'asset/resource', generator: { // publicPath: '/dist/fonts/', // outputPath: './fonts/', filename: 'fonts/[name][ext][query]', }, },

[MLoughry]

I encountered this issue after enabling esModule and module.namedExport in css-loader. While the above workarounds were not really applicable to my config, I found the setting experimentalUseImportModule: false bypasses the bad code in question and resolved my issue.

[alexander-akait]

@MLoughry You should not use experimentalUseImportModule