Standard Library
Below is the API for the OCaml standard library. It's directly copied over from the OCaml Manual, formatted to the Reason syntax and styled accordingly. The API docs are work-in-progress; we'll be polishing these gradually!
If you're targeting JavaScript, the API docs for BuckleScript includes all of below, plus JS-specific APIs.
sig val argv : string array val executable_name : string external file_exists : string -> bool = "caml_sys_file_exists" external is_directory : string -> bool = "caml_sys_is_directory" external remove : string -> unit = "caml_sys_remove" external rename : string -> string -> unit = "caml_sys_rename" external getenv : string -> string = "caml_sys_getenv" external command : string -> int = "caml_sys_system_command" external time : unit -> float = "caml_sys_time" external chdir : string -> unit = "caml_sys_chdir" external getcwd : unit -> string = "caml_sys_getcwd" external readdir : string -> string array = "caml_sys_read_directory" val interactive : bool Pervasives.ref val os_type : string val unix : bool val win32 : bool val cygwin : bool val word_size : int val big_endian : bool val max_string_length : int val max_array_length : int type signal_behavior = Signal_default | Signal_ignore | Signal_handle of (int -> unit) external signal : int -> Sys.signal_behavior -> Sys.signal_behavior = "caml_install_signal_handler" val set_signal : int -> Sys.signal_behavior -> unit val sigabrt : int val sigalrm : int val sigfpe : int val sighup : int val sigill : int val sigint : int val sigkill : int val sigpipe : int val sigquit : int val sigsegv : int val sigterm : int val sigusr1 : int val sigusr2 : int val sigchld : int val sigcont : int val sigstop : int val sigtstp : int val sigttin : int val sigttou : int val sigvtalrm : int val sigprof : int exception Break val catch_break : bool -> unit val ocaml_version : string end