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I see the following code in https://github.com/Microsoft/TypeScriptSamples/blob/master/t... , For me, it is definitively not the JS I know.

  declare var _: {

    each<T, U>(arr: T[], f: (elem: T) => U): U[];

    delay(f: Function, wait: number, ...arguments: any[]): number;

    template(template: string): (model: any) => string;

    bindAll(object: any, ...methodNames: string[]): void;

  };

  declare var Store: any;
If there is bug in this code, I won't know how to debug it.

I have no clue on what the JS generated by it looks like.

If I have to ask some JS programmer with no TS experience to integrate this "ts library" into their app and make sure the integrated app works on all browsers. I would have no clue on the complexity of the task just as I have no clue on how complex it was to make the GWT generated JS app to work on all browsers.

If it is just a JQuery / JS app, I can have 80-90% confident on schedule and quality of the app delivery.

But that's me, like I said, I am too old... :-)



Just wanted to point out that that isn't the JS you know because that's just typing information -- it isn't generating any code at all, it's telling TS what the types look like for Underscore's external methods. This would be stripped out completely in the compiled code. The actual code that results in JS just below that is much more typical.


This is only a typescript definition. It only shows you the types that were already there - even before typescript was introduced. And if the JS developer was not aware that these are the accepted types for the functions then he obviously wouldn't also be able to use or debug it in pure JS.


Right, for the human there are still the English API docs to figure out the arguments and return values. These are the type annotations that TypeScript uses to let you know when you've misinterpreted the API docs, which is an incredible time saver.




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