Hot reloading not longer working without specifying the port yourself

[PieterBoeren]

1. Create a new single-spa application
2. Update all dependencies to latest (including webpack)
3. Start the project with the start script (notice the 8080 port)
4. Open the single-spa playground in the browser with the devtools open, notice all kinds of webpack-dev-server errors

When I change the start script to contain a port (start": "webpack serve --port 8080"), everything works again.

It has probably something to do with the fixes in webpack-cli/serve as seen in the changelog: https://github.com/webpack/webpack-cli/blob/master/packages/serve/CHANGELOG.md

My workaround would probably be to add a static port to all my single-spa applications/libraries, but if this issue can't be solved without that, I guess an option to set a static port should be added to the creation wizard of create-single-spa.

[jolyndenning]

Appears to be a regression in @webpack-cli/serve. I created https://github.com/webpack/webpack-cli/issues/2696 - it's probably better to track it there since it's not something that can be fixed here in create-single-spa.