copy-webpack-plugin: Watch mode not working correctly for certain filetypes

• Operating System: Windows 10
• Node Version: 10.12.0
• NPM Version: 6.4.1
• webpack Version: 4.29.6
• copy-webpack-plugin Version: 5.0.0

Expected Behavior

• Files that are copied by this plugin should be watched & recopied when they are modified.
• Copied directories should watch for new/deleted files
• Globs should watch for new files matching it. The copy-and-watch npm module does this already by watching the parent directory and copying any files that match the glob. (Linking to a specific commit in my own fork because it actually works there, and in my opinion it’s more readable before I had to reformat because of lint settings.)

Actual Behavior

At first I thought copied files weren’t watched at all, but after some headaches I found out that it’s just files without a webpack loader. json files are copied, ejs files aren’t.

To add salt to injury, in my own project these “no-loader” files got copied sometimes when I modified another file that did have a loader first and if they were copied by a glob, and then it still only worked once for some reason. However I wasn’t able to reproduce this behavior in my reproducing-repository (it might have something to do with the context option). For now I think we should focus on making it work in a not-complicated environment, if the issue persists after that I’ll look into it more extensively.

As far as I can tell the copyUnmodified option doesn’t change anything.

Code

I’ve created a reproducing repository here, for my own project is private.

How Do We Reproduce?

• Clone aforementioned repository
• Run npx webpack --watch
• Modify one of the ejs files or create a new file in the assets directory
• Observe the absence of a build trigger