`sig
type t = string
val make : int -> char -> string
val init : int -> (int -> char) -> string
val empty : string
external length : string -> int = "%string_length"
external get : string -> int -> char = "%string_safe_get"
val of_bytes : bytes -> string
val to_bytes : string -> bytes
val blit : string -> int -> bytes -> int -> int -> unit
val concat : string -> string list -> string
val cat : string -> string -> string
val equal : String.t -> String.t -> bool
val compare : String.t -> String.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 -> int -> int -> string
val split_on_char : char -> string -> string list
val map : (char -> char) -> string -> string
val mapi : (int -> char -> char) -> string -> string
val fold_left : ('acc -> char -> 'acc) -> 'acc -> string -> 'acc
val fold_right : (char -> 'acc -> 'acc) -> string -> 'acc -> 'acc
val for_all : (char -> bool) -> string -> bool
val exists : (char -> bool) -> string -> bool
val trim : string -> string
val escaped : string -> string
val uppercase_ascii : string -> string
val lowercase_ascii : string -> string
val capitalize_ascii : string -> string
val uncapitalize_ascii : string -> string
val iter : (char -> unit) -> string -> unit
val iteri : (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 : String.t -> char Stdlib.Seq.t
val to_seqi : String.t -> (int * char) Stdlib.Seq.t
val of_seq : char Stdlib.Seq.t -> String.t
val get_utf_8_uchar : String.t -> int -> Stdlib.Uchar.utf_decode
val is_valid_utf_8 : String.t -> bool
val get_utf_16be_uchar : String.t -> int -> Stdlib.Uchar.utf_decode
val is_valid_utf_16be : String.t -> bool
val get_utf_16le_uchar : String.t -> int -> Stdlib.Uchar.utf_decode
val is_valid_utf_16le : String.t -> bool
val get_uint8 : string -> int -> int
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 hash : String.t -> int
val seeded_hash : int -> String.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
external unsafe_get : string -> int -> char = "%string_unsafe_get"
external unsafe_blit : string -> int -> bytes -> int -> int -> unit
= "caml_blit_string" [@@noalloc]
end`