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Scott Hanselman[^]:
TypeScript is a superset of JavaScript and you write it like you write JavaScript which I like. Any existing JavaScript is already TypeScript. One argument has been made that TypeScript is for people who don't want to learn JavaScript. I don't buy that. As Ward Bell said in an email: TypeScript is not a crutch any more than JSLint is a crutch. It doesn’t hide JavaScript (as CoffeeScript tends to do). - Ward Bell. I think Ward says it well. Folks rail against static typing but they don't complain about JSLint. TypeScript offers optional type annotations - it's hardly a perversion of JavaScript.

TypeScript has been out a day. It's way early to see if it has legs.