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 mk : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.core_type_desc -> Parsetree.core_type val attr : Parsetree.core_type -> Parsetree.attribute -> Parsetree.core_type val any : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> unit -> Parsetree.core_type val var : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> string -> Parsetree.core_type val arrow : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Asttypes.label -> Parsetree.core_type -> Parsetree.core_type -> Parsetree.core_type val tuple : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.core_type list -> Parsetree.core_type val constr : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.lid -> Parsetree.core_type list -> Parsetree.core_type val object_ : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> (string * Parsetree.attributes * Parsetree.core_type) list -> Asttypes.closed_flag -> Parsetree.core_type val class_ : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.lid -> Parsetree.core_type list -> Parsetree.core_type val alias : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.core_type -> string -> Parsetree.core_type val variant : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.row_field list -> Asttypes.closed_flag -> Asttypes.label list option -> Parsetree.core_type val poly : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> string list -> Parsetree.core_type -> Parsetree.core_type val package : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.lid -> (Ast_helper.lid * Parsetree.core_type) list -> Parsetree.core_type val extension : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.extension -> Parsetree.core_type val force_poly : Parsetree.core_type -> Parsetree.core_type end