Problem reloading electron

[WarrickFitz]

On windows after editing and saving App.tsx, the build completes, and that triggers the reload of electron. That however throws this error:

Uncaught Exception:
Error: EPERM: operation not permitted, watch
    at FSEvent.FSWatcher._handle.onchange (internal/fs/watchers.js:123:28)

[WarrickFitz]

Looks like it has something to do with the way webpack is locking the output. If I watch something other than the build\static folder it seems fine. I then tried installing the node-watch module

npm install node-watch

and replacing the logic with

    if (process.env.NODE_ENV !== 'production') {

        const watchPath = path.join(__dirname, "./build/static");

        watch(watchPath, { recursive: true, delay: 10000 }, 
            debounce((eventType, filename) => {
                watchPathExists = fs.existsSync(watchPath);
                console.log(`Reloading electron: ${watchPathExists}`);
                if (watchPathExists) {
                    mainWindow.destroy();
                    createWindow();
                }
            }, 50)
          );
    }

This seems to trigger correctly without and error, it closes the current electron instance but does not launch a new one for some reason?