[BUG] Can't run examples

[tarasglek]

Describe the bug

1. Ran all the build commands from https://github.com/ocaml-wasm/wasm_of_ocaml/tree/main/examples
   • dune build @examples/default
   • dune build @examples/boulderdash/default --profile wasm
2. Saw some errors

dune build @examples/default
File "lib/lwt/dune", line 4, characters 24-27:
4 |  (libraries js_of_ocaml lwt)
                            ^^^
Error: Library "lwt" not found.
-> required by library "js_of_ocaml-lwt" in _build/default/lib/lwt
-> required by executable boulderdash in examples/boulderdash/dune:2
-> required by _build/default/examples/boulderdash/boulderdash.bc.js
-> required by alias examples/boulderdash/default in
   examples/boulderdash/dune:18
File "examples/graphics/dune", line 4, characters 12-36:
4 |  (libraries js_of_ocaml-lwt.graphics)
                ^^^^^^^^^^^^^^^^^^^^^^^^
Error: Library "js_of_ocaml-lwt.graphics" in _build/default/lib/lwt/graphics
is hidden (optional with unavailable dependencies).
-> required by _build/default/examples/graphics/main.bc.js
-> required by alias examples/graphics/default in examples/graphics/dune:14

3. Ran python3 -m http.server in _build/default/examples
4. Every example that I navigate to is missing .bc.js files.

• eg GET http://b550:8000/graph_viewer/viewer_js.bc.js net::ERR_ABORTED 404 (File not found)

Why aren't .bc.js files being generate? Is there some instruction missing?

 wasm_of_ocaml/_build/default/examples$ find -name \*.bc.js
./test_wheel/test_wheel.bc.js

Expected behavior
Demos should work
Versions
Testing with git sha e6ca2d3214908d4c3300d33efcbccec359d8eaf2 of wasm_of_ocaml

[hhugo]

You need to install a bunch of dependencies.
opam install ./ --deps-only -t at the root of the repo should do it.

[tarasglek]

Thank you. Would be great to have that in the examples README.md

[tarasglek]

Really cool to see how small the compiled artifacts are. Is there a blog or some design docs for this? I think these might be the smallest working wasm binaries I've seen. Curious why stuff is packaged inline in .js instead of .wasm, etc

[vouillon]

The Wasm code is not inline but in the .bc.wasm.assets directory.

[tarasglek]

i was looking at browser network console, only bc.js was downloaded. Thus assumed it was inlined there

[vouillon]

Oh, are you sure you compiled the examples with the --profile wasm option? By default, we are only generating some JavaScript code.

[tarasglek]

Looked at commands above, realizedI just built one example with --profile wasm..Now it works as expected, very cool