grimcap

const chokidar = require('chokidar');
   ...
  devServer: {
    hot: true,
    overlay: {
      warnings: false,
      errors: true
    },
    before(app, server) {
      chokidar.watch([
        `${PATHS.src}/**/*.pug`
      ]).on('all', function() {
        server.sockWrite(server.sockets, 'content-changed');
      })
    }
  }
   ...