TypeScript 2.1 RC: Better Inference, Async Functions, and More

Better type inferencing of course makes writing code better for everyone.

Also, somewhat buried in this announcement is showing off support for more modular lib.d.ts support, which is also something that has been patiently needed. (Up to now the basic types and expectations of the target ES version you were transpiling to were in big monolithic definition files making it harder to "pick and choose" as needed for your project: the most common case being one shown here that most browsers support native promises from ES2015 and/or are easily polyfilled, but you still want to mostly stick everything else to ES5 output code for the time being.)

Sincerely, Microsoft, bravo!

    interface Color {
        isRed: boolean,
        name: string
    }

    function example(): Color {
        let x = {};
        x.isRed = false;
        x.name = "Cerulean";
        return x;
    }