Button to quickly show the generated JS output of an F# Fable file

[Darkle]

Hi, when using Rescript in VScode, the Rescript VSCode extension has a neat feature where you can click a button and it will show you the Javascript file that was generated for the Rescript file you have open. I think this would be a good feature to have in the Ionide extension too, as when using F# with Fable, you often want to check the output is right.

Screenshots of how it looks in Rescript extension:
Before clicked on button:

After clicked on button:

[MangelMaxime]

The difficulty with this feature is that Fable don't always generate the files alongside the source files.

Indeed, when using Fable user can specify an output directory. And I am not sure there is an elegant way of detecting these files.

Should we cover only the case where we detect source.fs.js files alongside the originated source.fs file?