module.rule.generator.emit = false results in different emitted filenames

[billyjanitsch]

• Operating System: macOS
• Node Version: 14.17.0
• NPM Version: 7.18.1
• webpack Version: 5.40.0
• image-minimizer-webpack-plugin Version: 2.2.0

Expected Behavior

When module.rule.generator.emit is set to false for asset resources, webpack is supposed to emit the same filename as when it's set to true.

Actual Behavior

This doesn't work correctly if there's an image minimizer in the chain, presumably because the minifier is only running when {emit: true} and ends up influencing the asset hash.

Note that this reproduces regardless of the asset filename, e.g., setting it to something like [contenthash][ext] does not fix the issue.

Not sure if this bug is specific to image-minimizer-webpack-plugin or generally an issue with webpack, so I'm reporting it in both places. (See webpack/webpack#13628.)

Code

Here is a minimal reproduction repo.

How Do We Reproduce?

See the readme and test file in the repo for details.

[alexander-akait]

Please do not duplicate issues

[alexander-akait]

Here bug https://github.com/webpack-contrib/image-minimizer-webpack-plugin/blob/v2.2.0/src/loader.js#L58

[alexander-akait]

Please add configuration for https://github.com/billyjanitsch/webpack-bug-emit-hash

[billyjanitsch]

The configuration is here.

[alexander-akait]

We prepare big refactor of the plugin and loader in near future, and will solve this problem, right now please disable loader https://github.com/webpack-contrib/image-minimizer-webpack-plugin#standalone-plugin

[billyjanitsch]

Thank you for the fast reply.

Disabling loader does not fix the issue. See this commit; the test still fails.

[alexander-akait]

I will look at this deeply in near future

[alexander-akait]

Fixed, sorry for big delay, we rewrite plugin from scratch and now have better support asset modules, here example to generate webp and oprimize images, please try https://github.com/webpack-contrib/image-minimizer-webpack-plugin#optimize-and-generate-webp-images