TypeScript 3.9 support

[mkrause]

Is this project still maintained? Looks like the TypeScript compiler is currently stuck at v3.7. This is starting to cause issues as some packages are starting to adopt newer TS syntax. For example, I cannot upgrade to the latest version of pretty-format without breaking tsd, because it uses import type syntax in its definitions:

https://github.com/facebook/jest/blob/master/packages/pretty-format/src/index.ts

[papb]

I am also waiting for feedback in some questions I raised in this repository... In the meantime, I have been using expect-type. It's a very different approach, and I like it so far.

[SamVerschueren]

Yes, I'm planning to upgrade in the coming days.

[SamVerschueren]

Released as 0.13.0.

[mkrause]

Thank you!