package decoders

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Pipeline decoders present an alternative to the mapN style. They read more naturally, but can lead to harder-to-understand type errors.

let person_decoder : person decoder =
  decode as_person
  |> required "name" string
  |> required "age" int

val decode : 'a -> 'a decoder

val required : string -> 'a decoder -> ('a -> 'b) decoder -> 'b decoder

val required_at : string list -> 'a decoder -> ('a -> 'b) decoder -> 'b decoder

val optional : string -> 'a decoder -> 'a -> ('a -> 'b) decoder -> 'b decoder

val optional_at : 
  string list ->
  'a decoder ->
  'a ->
  ('a -> 'b) decoder ->
  'b decoder

val custom : 'a decoder -> ('a -> 'b) decoder -> 'b decoder