Codesandbox-client: Upgrade TypeScript to 3.7 or greater

[gamedevsam]

🌈 Upgrade TypeScript version to 3.7 or greater

TS 3.7 brings along some MAJOR improvements to the language, including:

• Optional Chaining
• Nullish Coalescing
• Assertion Functions
• Recursive Type Aliases (my personal favorite)

My imported project doesn't work properly because I make use of recursive types and assertion functions: https://codesandbox.io/s/react-typescript-type-safe-redux-with-immerreducer-tdl7w

Ship TypeScript 3.7 or greater with the editor, please.

[stnwk]

What is blocking that from being possible? How can we help?

[garethx]

The version of TypeScript comes from VS Code, so we need to upgrade the version of VS Code we've integrated in order to enable this. As you might imagine, that's a significant amount of work. We've made good progress and I think we'll be able to do this soon, though I don't have dates to share yet.

[stnwk]

Thanks for the explanation! All the best with it :)

[FredyC]

I wonder, would it be impossible to somehow enable the use of TypeScript version installed through package.json? The VSCode allows but this option is missing in CS for some reason. That way you wouldn't need to update VSCode with every new TS version that brings important changes.

[CompuIves]

Heyo! We've updated TypeScript to v3.8.3 🎉! I like your suggestion @FredyC, this is definitely possible, I'll create an issue for it. https://github.com/codesandbox/codesandbox-client/issues/3904

In the meantime, we can close this one!