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.
Class Pprintast.printer
class printer : unit -> object .. end
val pipe : bool
val semi : bool
method binding : Format.formatter -> Parsetree.value_binding -> unit
method bindings : Format.formatter -> Asttypes.rec_flag * Parsetree.value_binding list -> unit
method case_list : Format.formatter -> Parsetree.case list -> unit
method class_expr : Format.formatter -> Parsetree.class_expr -> unit
method class_field : Format.formatter -> Parsetree.class_field -> unit
method class_params_def : Format.formatter -> (Parsetree.core_type * Asttypes.variance) list -> unit
method class_signature : Format.formatter -> Parsetree.class_signature -> unit
method class_structure : Format.formatter -> Parsetree.class_structure -> unit
method class_type : Format.formatter -> Parsetree.class_type -> unit
method class_type_declaration_list : Format.formatter -> Parsetree.class_type_declaration list -> unit
method constant : Format.formatter -> Asttypes.constant -> unit
method constant_string : Format.formatter -> string -> unit
method core_type : Format.formatter -> Parsetree.core_type -> unit
method core_type1 : Format.formatter -> Parsetree.core_type -> unit
method direction_flag : Format.formatter -> Asttypes.direction_flag -> unit
method directive_argument : Format.formatter -> Parsetree.directive_argument -> unit
method exception_declaration : Format.formatter -> Parsetree.extension_constructor -> unit
method expression : Format.formatter -> Parsetree.expression -> unit
method expression1 : Format.formatter -> Parsetree.expression -> unit
method expression2 : Format.formatter -> Parsetree.expression -> unit
method extension_constructor : Format.formatter -> Parsetree.extension_constructor -> unit
method label_exp : Format.formatter -> Asttypes.label * Parsetree.expression option * Parsetree.pattern -> unit
method label_x_expression_param : Format.formatter -> Asttypes.label * Parsetree.expression -> unit
method list : 'a. ?sep:space_formatter -> ?first:space_formatter -> ?last:space_formatter -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a list -> unit
method longident : Format.formatter -> Longident.t -> unit
method longident_loc : Format.formatter -> Longident.t Asttypes.loc -> unit
method module_expr : Format.formatter -> Parsetree.module_expr -> unit
method module_type : Format.formatter -> Parsetree.module_type -> unit
method mutable_flag : Format.formatter -> Asttypes.mutable_flag -> unit
method option : 'a. ?first:space_formatter -> ?last:space_formatter -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a option -> unit
method paren : 'a. ?first:space_formatter -> ?last:space_formatter -> bool -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a -> unit
method pattern : Format.formatter -> Parsetree.pattern -> unit
method pattern1 : Format.formatter -> Parsetree.pattern -> unit
method payload : Format.formatter -> Parsetree.payload -> unit
method private_flag : Format.formatter -> Asttypes.private_flag -> unit
method rec_flag : Format.formatter -> Asttypes.rec_flag -> unit
method nonrec_flag : Format.formatter -> Asttypes.rec_flag -> unit
method reset : < attribute : Format.formatter -> Parsetree.attribute -> unit; attributes : Format.formatter -> Parsetree.attributes -> unit; binding : Format.formatter -> Parsetree.value_binding -> unit; bindings : Format.formatter -> Asttypes.rec_flag * Parsetree.value_binding list -> unit; case_list : Format.formatter -> Parsetree.case list -> unit; class_expr : Format.formatter -> Parsetree.class_expr -> unit; class_field : Format.formatter -> Parsetree.class_field -> unit; class_params_def : Format.formatter -> (Parsetree.core_type * Asttypes.variance) list -> unit; class_signature : Format.formatter -> Parsetree.class_signature -> unit; class_structure : Format.formatter -> Parsetree.class_structure -> unit; class_type : Format.formatter -> Parsetree.class_type -> unit; class_type_declaration_list : Format.formatter -> Parsetree.class_type_declaration list -> unit; constant : Format.formatter -> Asttypes.constant -> unit; constant_string : Format.formatter -> string -> unit; core_type : Format.formatter -> Parsetree.core_type -> unit; core_type1 : Format.formatter -> Parsetree.core_type -> unit; direction_flag : Format.formatter -> Asttypes.direction_flag -> unit; directive_argument : Format.formatter -> Parsetree.directive_argument -> unit; exception_declaration : Format.formatter -> Parsetree.extension_constructor -> unit; expression : Format.formatter -> Parsetree.expression -> unit; expression1 : Format.formatter -> Parsetree.expression -> unit; expression2 : Format.formatter -> Parsetree.expression -> unit; extension : Format.formatter -> Parsetree.extension -> unit; extension_constructor : Format.formatter -> Parsetree.extension_constructor -> unit; floating_attribute : Format.formatter -> Parsetree.attribute -> unit; item_attribute : Format.formatter -> Parsetree.attribute -> unit; item_attributes : Format.formatter -> Parsetree.attributes -> unit; item_extension : Format.formatter -> Parsetree.extension -> unit; label_exp : Format.formatter -> Asttypes.label * Parsetree.expression option * Parsetree.pattern -> unit; label_x_expression_param : Format.formatter -> Asttypes.label * Parsetree.expression -> unit; list : 'a. ?sep:space_formatter -> ?first:space_formatter -> ?last:space_formatter -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a list -> unit; longident : Format.formatter -> Longident.t -> unit; longident_loc : Format.formatter -> Longident.t Asttypes.loc -> unit; module_expr : Format.formatter -> Parsetree.module_expr -> unit; module_type : Format.formatter -> Parsetree.module_type -> unit; mutable_flag : Format.formatter -> Asttypes.mutable_flag -> unit; nonrec_flag : Format.formatter -> Asttypes.rec_flag -> unit; option : 'a. ?first:space_formatter -> ?last:space_formatter -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a option -> unit; paren : 'a. ?first:space_formatter -> ?last:space_formatter -> bool -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a -> unit; pattern : Format.formatter -> Parsetree.pattern -> unit; pattern1 : Format.formatter -> Parsetree.pattern -> unit; payload : Format.formatter -> Parsetree.payload -> unit; private_flag : Format.formatter -> Asttypes.private_flag -> unit; rec_flag : Format.formatter -> Asttypes.rec_flag -> unit; reset : 'b; reset_ifthenelse : 'b; reset_pipe : 'b; reset_semi : 'b; signature : Format.formatter -> Parsetree.signature_item list -> unit; signature_item : Format.formatter -> Parsetree.signature_item -> unit; simple_expr : Format.formatter -> Parsetree.expression -> unit; simple_pattern : Format.formatter -> Parsetree.pattern -> unit; string_quot : Format.formatter -> Asttypes.label -> unit; structure : Format.formatter -> Parsetree.structure_item list -> unit; structure_item : Format.formatter -> Parsetree.structure_item -> unit; sugar_expr : Format.formatter -> Parsetree.expression -> bool; toplevel_phrase : Format.formatter -> Parsetree.toplevel_phrase -> unit; type_declaration : Format.formatter -> Parsetree.type_declaration -> unit; type_def_list : Format.formatter -> Parsetree.type_declaration list -> unit; type_extension : Format.formatter -> Parsetree.type_extension -> unit; type_param : Format.formatter -> Parsetree.core_type * Asttypes.variance -> unit; type_params : Format.formatter -> (Parsetree.core_type * Asttypes.variance) list -> unit; type_with_label : Format.formatter -> Asttypes.label * Parsetree.core_type -> unit; tyvar : Format.formatter -> string -> unit; under_ifthenelse : 'b; under_pipe : 'b; under_semi : 'b; value_description : Format.formatter -> Parsetree.value_description -> unit; virtual_flag : Format.formatter -> Asttypes.virtual_flag -> unit; .. > as 'b
method reset_semi : 'b
method reset_ifthenelse : 'b
method reset_pipe : 'b
method signature : Format.formatter -> Parsetree.signature_item list -> unit
method signature_item : Format.formatter -> Parsetree.signature_item -> unit
method simple_expr : Format.formatter -> Parsetree.expression -> unit
method simple_pattern : Format.formatter -> Parsetree.pattern -> unit
method string_quot : Format.formatter -> Asttypes.label -> unit
method structure : Format.formatter -> Parsetree.structure_item list -> unit
method structure_item : Format.formatter -> Parsetree.structure_item -> unit
method sugar_expr : Format.formatter -> Parsetree.expression -> bool
method toplevel_phrase : Format.formatter -> Parsetree.toplevel_phrase -> unit
method type_declaration : Format.formatter -> Parsetree.type_declaration -> unit
method type_def_list : Format.formatter -> Parsetree.type_declaration list -> unit
method type_extension : Format.formatter -> Parsetree.type_extension -> unit
method type_param : Format.formatter -> Parsetree.core_type * Asttypes.variance -> unit
method type_params : Format.formatter -> (Parsetree.core_type * Asttypes.variance) list -> unit
method type_with_label : Format.formatter -> Asttypes.label * Parsetree.core_type -> unit
method tyvar : Format.formatter -> string -> unit
method under_pipe : 'b
method under_semi : 'b
method under_ifthenelse : 'b
method value_description : Format.formatter -> Parsetree.value_description -> unit
method virtual_flag : Format.formatter -> Asttypes.virtual_flag -> unit
method attribute : Format.formatter -> Parsetree.attribute -> unit
method item_attribute : Format.formatter -> Parsetree.attribute -> unit
method floating_attribute : Format.formatter -> Parsetree.attribute -> unit
method attributes : Format.formatter -> Parsetree.attributes -> unit
method item_attributes : Format.formatter -> Parsetree.attributes -> unit
method extension : Format.formatter -> Parsetree.extension -> unit
method item_extension : Format.formatter -> Parsetree.extension -> unit