he/him 
JS Type Checker Wish List: Regex validated strings
type HexColor = /#[0-9a-f]+/i;
const color: HexColor = '#eee'; // fine
const color: HexColor = 'red'; // error!
Show this thread
-
``` function foo(x: /a+-b+/) { /*...*/ } declare var x: string; // Great, we have to write the same regex again. if (x.match(/a+-b+/)) { foo(x); } ```
``` const regex = /a+-b+/ // Matches is pretty gross, but just some way to turn it into a "validation" type function foo(x: Matches<regex>) { /*...*/ } declare var x: string; if (x.match(regex)) { foo(x); } ```
-
-
How about just using the keyword pattern instead of type, type feels a bit odd and then just use what you suggested.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.