Thanks Jens. If I paraphrase in my words, you would keep the "shell" (menu 
items etc) and have iFrames for new functionality? 

Sounds like a reasonable approach, although I'd prefer to have the "shell" 
in the new technology and have iFrames for the old GWT modules.

Have you come across any resources/examples that you can share?

Cheers, Thomas

On Friday, April 17, 2020 at 9:11:03 PM UTC+8, Jens wrote:
>
> Kind of in the same situation and I figured that using an iframe approach 
> is probably the best idea. So you would need to refactor your app in a way 
> that you can launch an external application in an iframe for a given menu 
> item, basically the content area in your app should be an iframe. That way 
> you could develop future content using a different framework (or even 
> multiple different frameworks!) and also refactor current/old GWT content 
> to fit into the iframe solution which shortens the compile time for these 
> new minimal GWT content applications. Finally you get the freedom to only 
> update parts of your application instead the whole beast.
>
> However when doing so and your app uses history tokens / pushstate you 
> need to figure out a good way to update the browser main location bar from 
> within the iframe.
>
> Personally I would consider using Angular, Vue or Svelte (with Sapper 
> being the Svelte app framework). While Angular and Vue both use virtual 
> DOM, Svelte does only look like it would use a virtual DOM but in reality 
> it compiles down to direct DOM operations which makes it more performant 
> than a virtual DOM based solution. I would only use React if there are 
> thoughts about using React Native as well, but then Flutter from Google 
> might also be interesting.
>
> -- J.
>

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