Normally, your angular app will re-compile after hitting that save (ctrl+s) and will reload your page on the browser. But when your app gets bigger, as I understand it correctly, it will have some memory leak and will stop the hot reloading. A small popup will appear on your VS Code and will give you the following error:
"Visual Studio Code is unable to watch for file changes in this large workspace" (error ENOSPC)
This gives you a notification that you need to increase the size of your watcher to listen for file changes. You can check/view your current watcher size by typing the following on your terminal:
I have experienced this using a linux/ubuntu OS, and to resolve this, you can increase the size of the watcher by typing:
$ sudo sysctl fs.inotify.max_user_watches=524288 $ sudo sysctl -p
skip the $ symbol
Your watcher is now updated to listen to 524288 or 512 MB of file changes.
Finally, re-run your app (i.e. ctrl+c and npm start or ng serve).