You don't, I do. TypeScript has been a revolution in the way that I write client side code, been able to write in a superset of a language I already know again

You don't, I do. TypeScript has been a revolution in the way that I write client side code, been able to write in a superset of a language I already know against existing code in a way that I and my tools can reason about and with faith (backed up by experience) that I can write it once and know it will work basically everywhere is huge. Is it a perfect tool? by no means, it's output messages can be a bit opaque. That I can also use features now that won't make it into browsers everywhere for a while and that they'll gradually replace those features as browser support for them increases, ES6 was a good step in the right direction (and you can target it from TS and in many cases there aren't that many differences between clean ES6 and TypeScript's output but I can also set the target to ES5 and use it). FWIW: https://github.com/Microsoft/TypeScript/pull/12346 https://github.com/Microsoft/TypeScript/pull/12346 https://basarat.gitbooks.io/typescript/content/docs/types/lib.d.ts.html#lib-option https://basarat.gitbooks.io/typescript/content/docs/types/li...