JavaScript boy and “lovely thoughtleader” 
he/him 
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
JS Type Checker Wish List: Regex validated strings
type HexColor = /#[0-9a-f]+/i;
const color: HexColor = '#eee'; // fine
const color: HexColor = 'red'; // error!
I don't really like using regexes here but it's the most intuitive API for defining a validation rule. Super trivial to implement in a type checker too (if it's written in JS, just delegate to the runtime engine). Could have some way to specify the actual message for errors too.
I want a type error.
I'm continuously blown away by the momentum and innovation of the TypeScript team 
https://twitter.com/drosenwasser/status/1062452381743439872 …
This is what @flowtype opaque types are for. Opaque types are super flexible as they can support arbitrary constraints on any value.
Also see dependent type systems.
Unclear how that would cover this use case? Imagine you had some CSS-in-JS API where you have your CSS properties typed. How would you define the `color` property without just using `string`?
Check Facebook's internal Flow support group. I asked for that feature before, and remember that there was a good reply. That feature would be helpful in many cases.
Just checked and it was "that's a great idea, we don't have time, PRs accepted" which is about what I expected haha
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
