list files changed

[dylang]

It would be nice to know what files thinks have changed. This can help debug issues where changing a file doesn't reload, or when it reloads without changing a file.

[glenjamin]

Seems like a reasonable suggestion to me, PRs welcome.

[dylang]

Results of spending too much time trying to figure out how get the changed file:

compiler.plugin('invalid', (filename) => {
    console.log('File changed', filename);
});

Now that I know how to do this, it would be nice if webpack-hot-middleware handled it, but not required.