Option (melange.Js.Option)

type t('a) = option('a);

module Js := Js__.Js_internal

let some: 'a => option('a);

let isSome: option('a) => bool;

let isSomeValue: Js.Fn.arity2(('a => 'a => bool)) => 'a => option('a) => bool;

let isNone: option('a) => bool;

let getExn: option('a) => 'a;

let equal: 
  Js.Fn.arity2(('a => 'b => bool)) =>
  option('a) =>
  option('b) =>
  bool;

let andThen: Js.Fn.arity1(('a => option('b))) => option('a) => option('b);

let map: Js.Fn.arity1(('a => 'b)) => option('a) => option('b);

let getWithDefault: 'a => option('a) => 'a;

let default: 'a => option('a) => 'a;

deprecated Use getWithDefault instead since default has special meaning in ES module

let filter: Js.Fn.arity1(('a => bool)) => option('a) => option('a);

let firstSome: option('a) => option('a) => option('a);