Hi Alon,
thank you very much and it's great to hear that you find this interesting.
I would be very interested in integrating this with emscripten of course.
How should we start this process? There are probably a few things that
still need to be implemented for a good MVP, so to speak.
Regards
Sebastian
Am Do., 6. Jan. 2022 um 21:59 Uhr schrieb Alon Zakai :
> Hi Sebastian,
>
> This is really nice! I watched your talk as well at CppCon (
> https://www.youtube.com/watch?v=CLuhogat6aY), very interesting.
>
> For a while it's seemed like we need something in this general area, so
> it's great to see it happen! I think this is a very good design, too (the
> performance issue with strings is the one concern I have, but as you say in
> the talk, that can be optimized - I'd use EM_JS for that probably).
>
> Did you have ideas about integrating this with upstream Emscripten? I
> think that might make sense to do, although maybe as part of a larger
> conversation on our bindings story (atm we have embind and the WebIDL
> binder, which already have some overlap).
>
> - Alon Zakai
>
> On Tue, Dec 28, 2021 at 2:21 AM Sebastian Theophil
> wrote:
>
>> Hi,
>>
>> I wanted to plug my own project for some time here on the mailing list
>> because it also handles JavaScript - C++ interop and now wajic came up so I
>> thought I pitch in.
>>
>> My project https://github.com/think-cell/typescripten produces type-safe
>> C++ interfaces to JavaScript standard libraries or third-party libraries.
>> It reads TypeScript interface definition files and transforms them into C++
>> shims based on emscripten.
>>
>> The resulting C++ code is often a straight-forward port from
>> TypeScript/JavaScript, e.g.,
>>
>> JavaScript:
>>
>> var elem = document.createElement("p")
>> elem.innerText = "Hello CppCon 2021"
>> elem.style.fontSize = "20.0"
>> document.body.appendChild(elem)
>>
>> C++:
>>
>> auto elem = js::document()->createElement(js::string("p"));
>> elem->innerText(js::string("Hello CppCon 2021"));
>> elem->style()->fontSize(js::string("20vh"));
>> js::document()->body()->appendChild(elem);
>>
>> No macros and the C++ functions return typed JavaScript objects! Because
>> we use the TypeScript interface definitions, the C++ code is typechecked.
>> Passing a number to fontSize will create a compiler error.
>>
>> The project is not yet meaningfully complete but it bootstraps
>> successfully, i.e., the compiler understands the interface definition file
>> for the TypeScript compiler and parser API that it uses itself. TypeScript
>> generic constraints are not yet supported, for example, but should be.
>>
>> Maybe somebody else finds this useful. We have used it internally for a
>> small web app already that needed to call the tableau.com JavaScript
>> API.
>>
>> Regards
>> Sebastian
>>
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