TypeScript dependent types and function bivariance

Posted by metaweta on Wednesday January 27, 2021 @03:22PM
from the reperiendi.wordpress.com dept.

https://reperiendi.wordpress.com/2021/01/27/2657/

( 2 comments | 19 points | on HN )

Re:TypeScript dependent types and function bivariance by lights0123 on Wednesday January 27, 2021 @09:56PM (#25937576)

> TypeScript now supports

What does "now" mean here? The sample code works fine on 3.3 (the earliest version I could select on the playground, I'm sure it works on earlier versions too), released in January 2019.

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Re:TypeScript dependent types and function bivariance by ameliaquining on Thursday January 28, 2021 @03:46AM (#25939659)

Conditional types were introduced in TypeScript 2.8, released March 2018. The sample code from the documentation dates back to 2014: https://web.archive.org/web/20140407071740/http://www.typesc...

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