Watch works exactly once without polling

[mnpenner]

Here's the scenario: I start up webpack-dev-server and wait for my page to finish loading. Then I edit a .less file on my computer, it gets rsync'd into my Vagrant box where webpack-dev-server is running, WDS picks up the change and HMR refreshes my CSS without a full page reload. However, when I edit my .less again then nothing happens. Nothing is logged to Chrome's dev console, and WDS doesn't print anything to the terminal.

If I enable polling,

watchOptions: {
    aggregateTimeout: 250,
    poll: 50
},

then everything works fine.

If I had to take a guess, I suspect rsync is recreating the file and that's destroying the [inotify?] watch. At least that would explain why it works once.

[ghost]

Ran into this issue today as well.

Adding watchOptions fixes it.

[sigo]

The same issue here. Problem was affected at all linux-machine at our office. Explicitly defining watchOptions works.

Thanks @mnpenner.

[SpaceK33z]

Jep, --watch-poll, or the watchOptions equivalent is necessary for Vagrant boxes to work.