dune

(library
 (name server_lib)
 (flags :standard -open ReactCompat -linkall)
 (modules :standard \ server_prod server_dev)
 (libraries 
   react_compat
   eio_main
   fmt.tty
   logs.fmt
   logs.threaded
   piaf
   ptime.clock.os
   routes
   server-reason-react.react
   server-reason-react.reactDom
   react_plugin
 )
 (preprocess (pps server-reason-react.ppx))
)

(executable
 (public_name server_prod)
 (name server_prod)
 (modules server_prod)
 (libraries server_lib react_plugin_static)
 (preprocess (pps server-reason-react.ppx))
)

(executable
 (public_name server_dev)
 (name server_dev)
 (modules server_dev)
 (flags :standard -linkall)
 (libraries server_lib react_plugin_dynamic)
 (preprocess (pps server-reason-react.ppx))
)

(rule
 (alias default)
 (deps ./server_dev.exe)
 (mode
  (promote (until-clean)))
 (action
  ; we want dune to write the file but not attach any fsevents listeners to it,
  ; so that watchexec can read from it without issues.
  ; this means no (target), no (with-stdout-to), just a bash command with stdout
  ; redirect inside a string
  (bash "date > %{project_root}/../../.processes/last_built_at.txt")))