At Tableau, what we've done is very similar to what Floh mentioned, but 
baked into our tooling. It's probably not for everyone, since we require 
calls into WASM be asynchronous, and Javascript access WASM's heap in a 
serializable way. From those restrictions, we're able to use a python 
server that loads a native version of our WASM, and exposes our methods via 
a REST interface. We even support native executing Javascript through 
Chrome's remote debugging protocol.

If there's interest keeping in mind those restrictions, I can look into 
sharing source.

On Friday, April 5, 2019 at 1:28:58 PM UTC-7, Alon Zakai wrote:
>
> Yeah, debugging is definitely one of the bigger missing pieces here. This 
> will hopefully improve soon in toolchains and browsers, there is ongoing 
> work on it. Meanwhile debugging a parallel native build is often best, as 
> mentioned.
>
> On Thu, Apr 4, 2019 at 8:56 PM Александр Гурьянов <[email protected] 
> <javascript:>> wrote:
>
>> Agree, I never debug emscripten output. Source map never works for big
>> code bases. So all bug fixing done by playing with C++ native build,
>> in hope that it will be ported 1:1, actually it's almost true.
>>
>> пт, 5 апр. 2019 г. в 03:28, Brian Gavin <[email protected] <javascript:>
>> >:
>> >
>> > My experience with source maps is similar to Floh.   Kind of works for 
>> very simple hello world apps but even then there are some lines I can not 
>> set breakpoints.  No variable inspection.   Stepping into and out of 
>> functions does not always work.
>> >
>> > Unfortunately my debugging technique is lots of prints and dump 
>> callstack.   You need to plan for development time to take longer then a 
>> regular C++ application.
>> >
>> > Better debugging is my number 1 feature wish.
>> >
>> > Brian Gavin
>> >
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