well this is a toplevel, now to add a ppx ast printer?

dune

@@ -1,20 +1,22 @@
 (env
  (dev (flags (:standard -warn-error -A))
-  (js_of_ocaml (flags --no-inline --pretty --source-map-inline --debug-info)
-   (build_runtime_flags --no-inline --pretty --source-map-inline --debug-info)
-   (link_flags --source-map-inline))))
+  (js_of_ocaml (flags :standard --no-inline --debug-info --target-env browser --disable shortvar)
+   (build_runtime_flags :standard --no-inline --debug-info)
+   (link_flags :standard))))
 
 (executable
  (name boot_js)
  (modes byte js)
  (preprocess (pps js_of_ocaml-ppx)) 
-
+ (flags (:standard -rectypes -linkall))
  (modules boot_js human)
  (libraries
    fmt
    logs
    graphv_webgl
    js_of_ocaml-lwt
+   js_of_ocaml-compiler
+   js_of_ocaml-toplevel
    digestif.ocaml
    checkseum.ocaml
    irmin.mem
@@ -23,8 +25,116 @@
    cohttp-lwt-jsoo
    mimic
    uri
-   zed
    gg
    lwd
 ))
 
+(executables
+ (names toplevel)
+ (modules
+  (:standard \ human boot_js test_dynlink examples))
+ (libraries
+  js_of_ocaml-compiler
+  js_of_ocaml-tyxml
+  js_of_ocaml-toplevel
+  lwt
+  js_of_ocaml-lwt
+  ;; not used directly
+  graphics
+  js_of_ocaml.deriving
+  react
+  reactiveData
+  str
+  (select
+   ocp_indent.ml
+   from
+   (ocp-indent.lib -> ocp_indent.ok.ml)
+   (-> ocp_indent.fake.ml))
+  (select
+   colorize.ml
+   from
+   (higlo -> colorize.higlo.ml)
+   (!higlo -> colorize.fake.ml))
+  (select
+   graphics_support.ml
+   from
+   (js_of_ocaml-lwt.graphics -> graphics_support.enabled.ml)
+   (-> graphics_support.disabled.ml))
+  (select
+   ppx_support.ml
+   from
+   (js_of_ocaml-ppx -> ppx_support.enabled.ml)
+   (-> ppx_support.disabled.ml)))
+ (flags
+  (:standard -rectypes -linkall))
+ (modes byte)
+ (preprocess
+  (pps js_of_ocaml-ppx)))
+
+(rule
+ (targets test_dynlink.cmo test_dynlink.cmi)
+ (action
+  (run ocamlc -c %{dep:test_dynlink.ml})))
+
+(rule
+ (targets test_dynlink.js)
+ (action
+  (run %{bin:js_of_ocaml} --pretty --toplevel %{dep:test_dynlink.cmo})))
+
+(rule
+ (targets export.txt)
+ (deps
+  (package js_of_ocaml-ppx)
+  (package js_of_ocaml)
+  (package js_of_ocaml-compiler)
+  (package js_of_ocaml-lwt)
+  (package js_of_ocaml-tyxml)
+  (package js_of_ocaml-toplevel))
+ (action
+  (run
+   jsoo_listunits
+   -o
+   %{targets}
+   stdlib
+   graphics
+   str
+   dynlink
+   js_of_ocaml-compiler.runtime
+   js_of_ocaml-lwt.graphics
+   js_of_ocaml-ppx.as-lib
+   js_of_ocaml.deriving
+   lwt
+   tyxml.functor
+   tyxml.functor:html_types.cmi
+   react
+   reactiveData
+   js_of_ocaml
+   js_of_ocaml-lwt
+   js_of_ocaml-tyxml
+   js_of_ocaml-toplevel
+   dynlink)))
+
+(rule
+ (targets toplevel.js)
+ (action
+  (run
+   %{bin:js_of_ocaml}
+   compile
+   --pretty
+   --Werror
+   --target-env
+   browser
+   --export
+   %{dep:export.txt}
+   --toplevel
+   --disable
+   shortvar
+   +toplevel.js
+   +dynlink.js
+   %{dep:toplevel.bc}
+   -o
+   %{targets})))
+
+(alias
+ (name default)
+ (deps toplevel.js index.html))