I really like how Facebook's Hack has a local file system monitor which incrementally compiles on file changes. I haven't used it yet, but it sounds like a nearly ideal compromise.
As far as I can tell, the language would also support a non-validating mode that would be more or less instantaneous (the transformations it performs are all local, and none of them involve knowledge of the types involved).
interface Person {
firstname: string;
lastname: string;
}
function greeter(person: Person) {
return 'Hello, ' + person.firstname + ' ' + person.lastname;
}
var user = {firstname: 'John', lastname: 'Doe'}
document.body.innerHTML = greeter(user);
This. at least the js one. Maybe VS is bundled with a Typescript compiler written in C# , i dont know,but clearly the javascript one is damn slow.
I know when Palantir was developing Eclipse tools for TypeScript they posted to the Codeplex project regarding performance issues and the team from MS responded with suggestions about caching and only recompiling the minimal targets necessary.