Watching single files broken on Windows since 4.4.0 because of wrong path separator

[frigus02]

Since version 4.4.0 watching of single files (from is no glob and points to file) is broken on Windows. I tracked it down to this change. It changes the file path on Windows like this:

// pattern before: { absoluteFrom: 'C:\\code\\notes\\src\\sw.js' }
pattern.absoluteFrom = escape(pattern.absoluteFrom);
// pattern after: { absoluteFrom: 'C:/code\\notes\\src\\sw.js' }

The path after the change is registered as a file dependency in webpack. But since it's wrong, webpack does not notice any changes to the file.

[alexander-akait]

@frigus02 can you create minimum reproducible test repo?

[frigus02]

Sure, here you go: https://github.com/frigus02/test-copy-webpack-plugin-path-separator

To reproduce, clone on Windows and do:

yarn install
yarn start

Then change the file copy.txt. Webpack will not notice any changes. Try the same on Linux and it works as expected.

[vsDizzy]

Changed from to glob as a workaround.

[alexander-akait]

@frigus02 Thanks for issue. Confirm. WIP

[alexander-akait]

@frigus02 can you test branch #230?

[frigus02]

Thanks @evilebottnawi. I tested the PR and can confirm that it solves the issue on Windows.