How would I go on about debugging file-loader in webpack v4?

[runofthemillgeek]

Hi there. I was trying to debug an issue that stemmed from file-loader responding to .mjs files. I tried to debug this by setting stats: "verbose" in devServer and core webpack config along with other similar settings. I did get a detailed log but I couldn't find a line there that told me that file-loader touched this particular file, if that makes sense. I can see lines about css-loader and such but none about file-loader. Is this because it intentionally doesn't have debug logging or am I missing something?

Would appreciate in general, if there's any source about debugging webpack configs/loaders/plugins.

[alexander-akait]

What it the problem?

[runofthemillgeek]

I've managed to resolve it by excluding .mjs in the config. It was picking up .mjs files and producing them in the output which caused "export X not found" sort of errors. But I was just curious as to if there are any logs about which loaders got invoked to help debug issues like this.