Opam setup:
$ opam install reason dune melange mel ocaml-lsp-server
$ cd basic-setup-with-alias/
$ dune build @app
$ cd _build/
$ pwd
/home/trite/git/melange-dune-sandbox/basic-setup-with-alias/_build
$ tree
.
├── default
│ ├── HelloOcaml.ml
│ ├── HelloReason.re
│ ├── HelloReason.re.ml
│ └── output
│ ├── HelloOcaml.js
│ └── HelloReason.js
└── log
2 directories, 6 files
$ cd basic-setup-without-alias/
$ dune build
$ cd _build/
$ pwd
/home/trite/git/melange-dune-sandbox/basic-setup-without-alias/_build
$ tree
.
├── default
│ ├── HelloReason.re
│ └── HelloReason.re.ml
└── log
1 directory, 3 files