dune

; `melange.emit` is a Dune stanza that will produce build rules to generate
; JavaScript files from sources using the Melange compiler
; https://dune.readthedocs.io/en/stable/melange.html#melange-emit
(melange.emit

 ; The `target` field is used by Dune to put all JavaScript artifacts in a specific folder inside `_build/default`
 ; This field `target` allows to have multiple `melange.emit` stanzas in the `dune` file
 ; if, for example, we want to produce ES6 and CommonJS output from the same sources.
 (target output)

 ; Here's the list of dependencies of the stanza. In this case (being `melange.emit`),
 ; Dune will look into those dependencies and generate rules with JavaScript targets
 ; for the modules in those libraries as well.
 ; Caveat: the libraries need to be specified with `(modes melange)`.
 (libraries melange-webapi) 

 ; Uncomment the following to copy the generated JavaScript files inside the source tree
 ; (promote (until-clean))

 (preprocess
  (pps melange.ppx))
 (module_systems es6))