Upgrade TypeScript

[AbhiPrasad]

Currently the SDK is on TS version 3.8.3. When we upgrade our TS version as part of the new major we should explore if we can emit definition files for older typescript versions using the typesVersions command. See: https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#version-selection-with-typesversions

https://github.com/DefinitelyTyped/DefinitelyTyped#i-want-to-use-features-from-very-new-typescript-versions

[varadkarpe]

Hey, can I contribute to this issue?

[AbhiPrasad]

Hey @varadkarpe feel free to investigate and take a look! Note that we can’t immediately merge stuff that is breaking, so if you can find something that is non-breaking, even better!

[mydea]

This has been done already, we now ship both TS 4.9 & TS 3.8 types, while using TS 4.9 internally.