TypeScript about forge-sparks

[rafaelmardojai]

Yes I would accept a PR.

I wanted to port to TypeScript some time ago, but it was a bit unclear which type definition generator to use. Also I remember that when implementing an interface you had to implement even the methods that are not needed, like items_changed in Gio.ListModel, not sure if this is still a thing. Another complication was that I didn't have time to figure out the best way to combine gjspack with TypeScript.

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We are currently merging the two generators ts-for-gir and gi.ts :)

These are exactly the kind of problems we need feedback on to make the generator better 👍 I hope I find the time for a PR soon