Disable dev-server reload for PHP files?

[stephanvierkant]

Every time I change a PHP file in my project, dev-server reloads the page. That is really annoying, because when I create a syntax error, dev-server (/usr/bin/yarn encore dev-server) crashes:

[webpack-dev-server] 404s will fallback to '/index.html'
3% setup watch run RouteDump_Watchnode:internal/errors:984
const err = new Error(message);
^

// ...

stdout: 'ParseError {#5965\n' +
' #message: "syntax error, unexpected identifier "instancof""\n' +
' #code: 0\n' +

// ..
stderr: '2024-05-01T18:46:09+00:00 [critical] Uncaught Error: syntax error, unexpected identifier "instancof"\n'
}

Node.js v21.7.3
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Process finished with exit code 1

This is my config:

.configureDevServerOptions(options => {
    options.server = {
      type: 'https',
      options: {
        pfx: path.join(process.env.HOME, '.symfony/certs/default.p12')
      }
    }
    options.allowedHosts = 'all'
    options.port = 8080
    options.client = {
      overlay: false
    }
  })

I tried options.watchFiles, hot=false, etc. Nothing works. How can I disable this behaviour? It shouldn't reload when changing PHP files.