Hello! The mounting project (be it root or not) will always throw any errors during the evaluation of the mount lifecycle chain. The shell blanking is a possibility. Error boundaries are framework things that developers may opt to use, but since they are framework-specific CollageJS doesn't include them by default. Fallbacks are in the same category: Not included because it is up to developers whether to use fallbacks.

Generally speaking, developers/teams should always externalize using the import map entries. The Vite plug-in @collagejs/vite-aim (the hidden plug-in) does this externalization using the root project's import map, minimizing the possibility of errors due to version differences.