Fails on build: The module or file Lexer_flow can't be found.

[kristianmandrup]

Trying to build it on a MacOSX

"Make sure you're on OPAM switch 4.02.3 (might work with other switches; haven't tried)
You need reason (refmt) and ocamllex installed through OPAM (latter comes by default)"

Not sure how I can test that I have all the required dependencies installed and correct versions. Error seems to be that it can't find ocamllex

Should I install via homebrew?

https://ocaml.org/docs/install.html#Homebrew-Homebrew

brew install ocaml
brew install opam

Tried installing ocaml and opam via brew, but still fails :(

Build error

$ git clone https://github.com/chenglou/jeason.git
Cloning into 'jeason'...
remote: Enumerating objects: 41160, done.
remote: Total 41160 (delta 0), reused 0 (delta 0), pack-reused 41160
Receiving objects: 100% (41160/41160), 11.11 MiB | 4.32 MiB/s, done.
Resolving deltas: 100% (29406/29406), done.
✔ ~/repos/reason-projects 
10:02 $ cd jeason/
✔ ~/repos/reason-projects/jeason [master|✔] 
10:02 $ yarn && yarn build
yarn install v1.5.1
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
$ npm run build

> [email protected] build /Users/kristianmandrup/repos/reason-projects/jeason
> bsb -make-world

ninja: Entering directory `/Users/kristianmandrup/repos/reason-projects/jeason/lib/bs/bytecode'
[20/20] Building parser_flow.mlast.d
[6/11] Building parser_env.cmi
FAILED: parser_env.cmi 
/Users/kristianmandrup/repos/reason-projects/jeason/node_modules/bs-platform/vendor/ocaml/ocamlc.opt  -bs-super-errors -I /Users/kristianmandrup/repos/reason-projects/jeason/node_modules/bs-platform/lib/ocaml/bytecode  -I /Users/kristianmandrup/repos/reason-projects/jeason/node_modules/bs-platform/vendor/ocaml/lib/ocaml -I .   -I /Users/kristianmandrup/repos/reason-projects/jeason/node_modules/bs-platform/vendor/ocaml/lib/ocaml/compiler-libs  -no-alias-deps   -color   always -o parser_env.cmi -w -30-40+6+7+27+32..39+44+45+101-40-20-21-26-27-28-32-45-44-33-37-34-39-6 -g -c -intf parser_env.mliast_simple 

  We've found a bug for you!
  /Users/kristianmandrup/repos/reason-projects/jeason/parser_env.mli 29:10-27
  
  27 │ type token_sink_result = {
  28 │   token_loc: Loc.t;
  29 │   token: Lexer_flow.Token.t;
  30 │   token_context: Lex_mode.t;
  31 │   token_value: string;
  
  The module or file Lexer_flow can't be found.
  
  - If it's a third-party dependency:
    - Did you list it in bsconfig.json?
    - Did you run `bsb` instead of `bsb -make-world`
      (latter builds third-parties)?
  - Did you include the file's directory in bsconfig.json?
  
[7/11] Building estree_translator.cmo
ninja: build stopped: subcommand failed.