[BUG] Compiling using `--profile=release` leads to runtime errors

[xvw]

Describe the bug
At @funkywork, we're working on a collection of tools to interact with Tezos. We recently realized that when using our libraries, producing JavaScript artifacts with the release profile generates incorrect JavaScript output. For example, in this project (I think it's pretty minimal): https://github.com/funkywork/tezos-dapps-examples/tree/main.
Using dune build; dune exec bin/server/dapps.exe and going to http://localhost:8888/dapps/connect launch properly the apps. But if you run dune build --profile=release; dune exec bin/server/dapps.exe you will have an error console:

12:10:45.847 Uncaught SyntaxError: missing ) after argument list client.bc.js:4635
12:10:45.848 Uncaught ReferenceError: nightmare_js is not defined
    <anonymous> http://localhost:8888/dapps/connect:2
connect:2:358
12:10:45.848 Uncaught ReferenceError: nightmare_js is not defined
    <anonymous> http://localhost:8888/dapps/connect:2
connect:2:465

And here is the client.bc.js generated: https://gist.githubusercontent.com/xvw/d679d490d085e671f926e106cfff37b5/raw/69c2c552065c0466a93a4c05b323ccf75c6ef01a/client.bc.js

From a development point of view, this isn't a problem, but it does make it difficult to put things into production, as the non-release bundle weighs in at ~16mb, compared with ~2mb for release.

If I can provide any additional information, or create a smaller example, please don't hesitate to ask!

Versions

• ocaml: 5.0.0
• js_of_ocaml: 5.4.0+git-e0d000e-dirty

[hhugo]

There seem to be an issue with the printing of some es6 construct. Can you list all the js files that your bundle in your app ?

[vouillon]

The issue is a newline right after an async keyword.
We need to check that we follow the rules in this section: https://tc39.es/ecma262/#sec-rules-of-automatic-semicolon-insertion

fm=b=>async
a=>new
Uint8Array(await
crypto.subtle.digest(b,a)) [...]

[xvw]

There seem to be an issue with the printing of some es6 construct. Can you list all the js files that your bundle in your app ?

It is a little bit hard since we built using NPM, but here are the two bundled files (I guess) :
https://gist.github.com/xvw/fff8e06829a9409be4739fb66f98b164 (i guess the culprit come from https://gist.github.com/xvw/fff8e06829a9409be4739fb66f98b164#file-beacon_stubs-js)