String Union Autocomplete Support

[basarat]

Something along:

type Foo = "aReallyLong" | "bReallyLong";
let foo:Foo;
foo = "aReally // Here 

Similar to #5602 🌹 (also requested here #3192 (comment))

[olmobrutall]

👍
...not sure it the autocomplete should be triggered on = or " however.

[mhegazy]

+1. PRs welcomed

[Ciantic]

Is equality autocompletion possiblity too? E.g. foo === "aReally here.

P.S. in equality comparsion it would be nice to have error checking when using bare string, like

foo === "not" would be flagged as error since foo can be demonstrated to never have this "not"

[basarat]

Its been supported for a while:

Thanks TS Folks 🌹 ❤️