DWARF is a debugging data format for ELF files.[1]

WebDWARF then would be to WebASM, as DWARF is to ELF files.

[1]https://en.wikipedia.org/wiki/DWARF

I'm suggesting that when debugging optimized code, you'll use -g as on native platforms. I'm speculating further that with wasm, decompilers will rise to the view source challenge.