How does the BangleJS emulator link with the Espruino repo

So i want to make changes to BangleJS software and i want to make sure the changes i make don't effect the emulator functionality.

So what I'm curious how does the webIDE link up with the Espruino library. I see there's a webpages for the different bangle watches. I see there is this blob that I'm guessing is the emulator.

So I know i need to build this in Espruino repo and then i guess copy it to this folder?

So i see there's the linux_build_bangleJS2, but not one for the bangleJS1.

The emulator for the IDE is build with this script: https://github.com/espruino/EspruinoWebI­DE/blob/master/extras/create_emulator.sh­

So the actual board targets are (confusingly) just EMSCRIPTEN.py and EMSCRIPTEN2.py

The Linux build was an unused attempt at making a linux executable for testing Bangle.js apps, but in the end I figured it was safer just to use the JS Emscripten app for that

With the latest build Espruino, EsperuinoWebIDE and EMCC, i'm getting this error when i try to build the Emulator.

error: undefined symbol: emscripten_memcpy_js (referenced by root reference (e.g. compiled C/C++ code))
warning: To disable errors for undefined symbols use -**sERROR_ON_UNDEFINED_SYMBOLS=0**
warning: _emscripten_memcpy_js may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors
emcc: error: '/home/brendena/code/newCode/emsdk/node/­16.20.0_64bit/bin/node /home/brendena/code/newCode/emsdk/upstre­am/emscripten/src/compiler.mjs /tmp/tmp54wpsiw5.json' failed (returned 1)

NodeJS -v 20 - but i don't know if this matters because EMCC uses its own NodeJS

So i tried to add it to the EXPORTED_FUNCTIONS, but i get this error.

wasm-ld: error: symbol exported via --export not found: emscripten_memcpy_js

I don't really get the error. I feel like a memcpy function should be fairly universal?

That's odd - I'm not sure to be honest. Currently it's feeling like just playing catch-up with all the stuff everyone else randomly changes is a full-time job.

I'm building with Emscripten 3.1.13 and that works for me, so you could try that

I can see that. That's the beauty and problem with coding. Its always changing. haha

So that change is from
3.1.13 - 06/02/2022

So I'll look through the change log and see what's changed. Logs

Its interesting from if i'm inside the esperuino repo and build it. Its fine.

• make board="EMSCRIPTEN2" RELEASE=1
  
  

But when the same command runs in the esperuinoWebIDE. It fails? Have to look into this more.