error.txt

% npm run build                  

> [email protected] build /Users/james/projects/loot-sync
> eval $(dependencyEnv) && nopam && rebel

*** jenga: [47575] root=/Users/james/projects/loot-sync, sys=Darwin, j=1, f=1 (NO_VERSION_UTIL)
- build . Default_Tar__Index.cmx
+ bash -c 'ocamlfind ocamlopt -pp refmt -bin-annot -g -w -30 -w -40 -open Default_Tar -I _build/default/src  -package async  -o _build/default/src/Default_Tar__Index -c -impl src/Index.re 2>&1| berror; (exit ${PIPESTATUS[0]})'
ocamlfind: Error from package `threads': Missing -thread or -vmthread switch
- exit . Default_Tar__Index.cmx, 282ms, exited with code 2
*** jenga: 7/10 targets are up to date
*** jenga: failed (#1, 516ms, heap=407.352m, stat=22, digest=1, ls=0, db-save=0)
*** jenga: todo: 0 (7 / 10) !1 ~2 j=0+0 con=10 save=0 act=2, finished
*** jenga: ERROR: (summary) _build/default/src/Default_Tar__Index.cmx: External command failed
      - build . Default_Tar__Index.cmx
      + bash -c 'ocamlfind ocamlopt -pp refmt -bin-annot -g -w -30 -w -40 -open Default_Tar -I _build/default/src  -package async  -o _build/default/src/Default_Tar__Index -c -impl src/Index.re 2>&1| berror; (exit ${PIPESTATUS[0]})'
      ocamlfind: Error from package `threads': Missing -thread or -vmthread switch
      - exit . Default_Tar__Index.cmx, 282ms, exited with code 2
*** jenga: build finished; not in polling mode so quitting
*** jenga: Quit; exit_code = 1

package.json

...
  "rebel": {
    "ocamlfindDependencies": [
      "async"
    ]
  }
...

test.re

open Async;

let msg = "Hello Reason!";

print_string msg;

print_newline ();