Is dune just for building targets, or can I also make it organize build output?

Learning
10

You can avoid much of that by using diskuvbox. (I’m biased since I wrote it.)

Install it:

opam install diskuvbox js_of_ocaml-compiler

Then you can use an easy-to-understand solution:

(executables
 (names bg long_click prefs)
 (modes js)
 ;(libraries js_of_ocaml js_of_ocaml-lwt promise_jsoo ocaml-vdom)
 ;(preprocess
 ; (pps lwt_ppx js_of_ocaml-ppx))
 )

(rule
 (alias dev)
 (deps
  (glob_files icons/*)
  (:rootfiles manifest.json preferences.html)
  (:jsfiles bg.bc.js long_click.bc.js prefs.bc.js))
 (action
  (progn
   (run diskuvbox copy-file-into %{rootfiles} output/)
   (run diskuvbox copy-file-into %{jsfiles} output/js)
   (run diskuvbox copy-dir icons output/icons))))

Working test code is at GitHub - jonahbeckford/discuss-ocaml-org-10368 . Use diskuvbox on your command line to get help.

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