Running latest example doesn't work with TS 2.7.2

[henrikra]

When running following code with TS 2.7.2

type User = {
  name?: {
    first: string
  }
}
const user: User = {name: null};
const optionalUser = optional(user);
optionalUser.k("name").k("first").get();

I will get error Property 'get' does not exist on type 'Option<string>'

What is wrong? With TS 2.9.2 I will not get error. Problem is that I am not able to upgrade TS yet because of other problems

[henrikra]

Hmm I guess it is because of this line: https://github.com/yayoc/optional-chain/blob/master/src/index.ts#L10 Since conditional types came to TS in 2.8 :/

[yayoc]

Yes, This library requires TS 2.8+ to use conditional types.

[henrikra]

Maybe you should add it to README?

[yayoc]

I noted the requirement on README, Thanks.

[henrikra]

Very nice! I am able to test this in couple weeks since then I can update to TS 2.8. Have you used this library in production yet or just hobby projects?