Don't mutate joo_global_object / globalThis to define js_of_ocaml stubs

[hhugo]

This may prevent multiple programs from running concurrently.

See ocsigen/js_of_ocaml#1622

[smorimoto]

@hhugo Could you tell us more detailed ways to fix it?

[hhugo]

Looking at this more. It seems that this repo replicated the design found in gen_js_api. I will open a ticket there.

First, joo_global_object is deprecated (a warning will be emitted with the upcoming release of jsoo. You should use globalThis instead.

One way to implement binding with jsoo is to rely on external primitives, documented succinctly in https://ocsigen.org/js_of_ocaml/latest/manual/linker.

When using gen_js_api, I don't know how to not mutate the global object. Let see what people say on the gen_js_api repo.

[hhugo]

LexiFi/gen_js_api#177

[smorimoto]

Thanks a lot!