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.
module Mty: sig .. end
val mk : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.module_type_desc -> Parsetree.module_type
val attr : Parsetree.module_type -> Parsetree.attribute -> Parsetree.module_type
val ident : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.lid -> Parsetree.module_type
val alias : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.lid -> Parsetree.module_type
val signature : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.signature -> Parsetree.module_type
val functor_ : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Ast_helper.str -> Parsetree.module_type option -> Parsetree.module_type -> Parsetree.module_type
val with_ : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.module_type -> Parsetree.with_constraint list -> Parsetree.module_type
val typeof_ : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.module_expr -> Parsetree.module_type
val extension : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> Parsetree.extension -> Parsetree.module_type