`include module type of struct include Stdlib.StringLabels end`
`type t = string`
`val make : int -> char -> string`
`val init : int -> f:(int -> char) -> string`
`val empty : string`
`val length : string -> int`
`val get : string -> int -> char`
`val of_bytes : bytes -> string`
`val to_bytes : string -> bytes`
`val blit : src:string -> src_pos:int -> dst:bytes -> dst_pos:int -> len:int -> unit`
`val concat : sep:string -> string list -> string`
`val cat : string -> string -> string`
`val compare : t -> t -> int`
`val starts_with : prefix:string -> string -> bool`
`val ends_with : suffix:string -> string -> bool`
`val contains_from : string -> int -> char -> bool`
`val rcontains_from : string -> int -> char -> bool`
`val contains : string -> char -> bool`
`val sub : string -> pos:int -> len:int -> string`
`val split_on_char : sep:char -> string -> string list`
`val map : f:(char -> char) -> string -> string`
`val mapi : f:(int -> char -> char) -> string -> string`
`val exists : f:(char -> bool) -> string -> bool`
`val trim : string -> string`
`val escaped : string -> string`
`val uppercase_ascii : string -> string`
`val lowercase_ascii : string -> string`
`val iter : f:(char -> unit) -> string -> unit`
`val iteri : f:(int -> char -> unit) -> string -> unit`
`val index_from : string -> int -> char -> int`
`val index_from_opt : string -> int -> char -> int option`
`val rindex_from : string -> int -> char -> int`
`val rindex_from_opt : string -> int -> char -> int option`
`val index : string -> char -> int`
`val index_opt : string -> char -> int option`
`val rindex : string -> char -> int`
`val rindex_opt : string -> char -> int option`
`val to_seq : t -> char Stdlib.Seq.t`
`val to_seqi : t -> (int * char) Stdlib.Seq.t`
`val of_seq : char Stdlib.Seq.t -> t`
`val get_utf_16be_uchar : t -> int -> Stdlib.Uchar.utf_decode`
`val is_valid_utf_16be : t -> bool`
`val get_utf_16le_uchar : t -> int -> Stdlib.Uchar.utf_decode`
`val is_valid_utf_16le : t -> bool`
`val get_int8 : string -> int -> int`
`val get_uint16_ne : string -> int -> int`
`val get_uint16_be : string -> int -> int`
`val get_uint16_le : string -> int -> int`
`val get_int16_ne : string -> int -> int`
`val get_int16_be : string -> int -> int`
`val get_int16_le : string -> int -> int`
`val get_int32_ne : string -> int -> int32`
`val seeded_hash : int -> t -> int`
`val get_int32_be : string -> int -> int32`
`val get_int32_le : string -> int -> int32`
`val get_int64_ne : string -> int -> int64`
`val get_int64_be : string -> int -> int64`
`val get_int64_le : string -> int -> int64`
`val unsafe_get : string -> int -> char`
`val unsafe_blit : src:string -> src_pos:int -> dst:bytes -> dst_pos:int -> len:int -> unit`
`val equal : string -> string -> bool`
`val hash : string -> int`
`val is_empty : string -> bool`
`val is_prefix : prefix:string -> string -> bool`
`val is_suffix : suffix:string -> string -> bool`
`val drop_prefix : prefix:string -> string -> string option`
`val for_all : string -> f:(char -> bool) -> bool`
`val is_ascii : string -> bool`
`val has_backslash : string -> bool`
`val split_char : sep:char -> string -> string list`
`val split : sep:string -> string -> string list`
`val apply1 : (char -> char) -> string -> string`
`val lsplit2 : string -> on:char -> (string * string) option`
`val rsplit2 : string -> on:char -> (string * string) option`
`val capitalize_ascii : string -> string`
`val uncapitalize_ascii : string -> string`
`val not_in_x80_to_xBF : int -> bool`
`val not_in_xA0_to_xBF : int -> bool`
`val not_in_x80_to_x9F : int -> bool`
`val not_in_x90_to_xBF : int -> bool`
`val not_in_x80_to_x8F : int -> bool`
`val utf_8_uchar_2 : int -> int -> int`
`val utf_8_uchar_3 : int -> int -> int -> int`
`val utf_8_uchar_4 : int -> int -> int -> int -> int`
`val get_uint8 : string -> int -> int`
`val unsafe_get_uint8 : string -> int -> int`
`val dec_invalid : int -> Uchar.utf_decode`
`val dec_ret : int -> int -> Uchar.utf_decode`
`val get_utf_8_uchar : string -> int -> Uchar.utf_decode`
`val fold_utf_8 : string -> f:('a -> int -> Uchar.t -> 'a) -> 'a -> 'a`
`val fix_utf_8 : string -> string`
`val is_valid_utf_8 : string -> bool`
`val fold_left : f:('a -> char -> 'a) -> init:'a -> string -> 'a`
`val fold_right : f:(char -> 'a -> 'a) -> string -> init:'a -> 'a`