export declare const alt: <A>(second: Lazy<IOOption<A>>) => (first: IOOption<A>) => IOOption<A>

export declare const altW: <B>(second: Lazy<IOOption<B>>) => <A>(first: IOOption<A>) => IOOption<B | A>

export declare const ap: <A>(fa: IOOption<A>) => <B>(fab: IOOption<(a: A) => B>) => IOOption<B>

export declare const compact: <A>(fa: IOOption<O.Option<A>>) => IOOption<A>

export declare const separate: <A, B>(fa: IOOption<Either<A, B>>) => Separated<IOOption<A>, IOOption<B>>

export declare const filter: {
  <A, B extends A>(refinement: Refinement<A, B>): (fb: IOOption<A>) => IOOption<B>
  <A>(predicate: Predicate<A>): <B extends A>(fb: IOOption<B>) => IOOption<B>
  <A>(predicate: Predicate<A>): (fa: IOOption<A>) => IOOption<A>
}

export declare const filterMap: <A, B>(f: (a: A) => O.Option<B>) => (fga: IOOption<A>) => IOOption<B>

export declare const partition: {
  <A, B extends A>(refinement: Refinement<A, B>): (fb: IOOption<A>) => Separated<IOOption<A>, IOOption<B>>
  <A>(predicate: Predicate<A>): <B extends A>(fb: IOOption<B>) => Separated<IOOption<B>, IOOption<B>>
  <A>(predicate: Predicate<A>): (fa: IOOption<A>) => Separated<IOOption<A>, IOOption<A>>
}

export declare const partitionMap: <A, B, C>(
  f: (a: A) => Either<B, C>
) => (fa: IOOption<A>) => Separated<IOOption<B>, IOOption<C>>

export declare const map: <A, B>(f: (a: A) => B) => (fa: IOOption<A>) => IOOption<B>

export declare const chain: <A, B>(f: (a: A) => IOOption<B>) => (ma: IOOption<A>) => IOOption<B>

export declare const of: <A>(a: A) => IOOption<A>

export declare const zero: <A>() => IOOption<A>

export declare const apFirst: <B>(second: IOOption<B>) => <A>(first: IOOption<A>) => IOOption<A>

export declare const apSecond: <B>(second: IOOption<B>) => <A>(first: IOOption<A>) => IOOption<B>

export declare const chainEitherK: <E, A, B>(f: (a: A) => Either<E, B>) => (ma: IOOption<A>) => IOOption<B>

export declare const chainFirst: <A, B>(f: (a: A) => IOOption<B>) => (first: IOOption<A>) => IOOption<A>

export declare const chainFirstEitherK: <E, A, B>(f: (a: A) => Either<E, B>) => (ma: IOOption<A>) => IOOption<A>

export declare const chainFirstIOK: <A, B>(f: (a: A) => I.IO<B>) => (first: IOOption<A>) => IOOption<A>

export declare const chainIOK: <A, B>(f: (a: A) => I.IO<B>) => (first: IOOption<A>) => IOOption<B>

export declare const chainOptionK: <A, B>(f: (a: A) => O.Option<B>) => (ma: IOOption<A>) => IOOption<B>

export declare const flap: <A>(a: A) => <B>(fab: IOOption<(a: A) => B>) => IOOption<B>

export declare const flatten: <A>(mma: IOOption<IOOption<A>>) => IOOption<A>

export declare const fromEitherK: <E, A, B>(f: (...a: A) => Either<E, B>) => (...a: A) => IOOption<B>

export declare const fromIOK: <A, B>(f: (...a: A) => I.IO<B>) => (...a: A) => IOOption<B>

export declare const fromOptionK: <A extends readonly unknown[], B>(
  f: (...a: A) => O.Option<B>
) => (...a: A) => IOOption<B>

export declare const fromPredicate: {
  <A, B extends A>(refinement: Refinement<A, B>): (a: A) => IOOption<B>
  <A>(predicate: Predicate<A>): <B extends A>(b: B) => IOOption<B>
  <A>(predicate: Predicate<A>): (a: A) => IOOption<A>
}

export declare const guard: (b: boolean) => IOOption<void>

export declare const none: IOOption<never>

export declare const some: <A>(a: A) => IOOption<A>

export declare const fold: <B, A>(onNone: () => I.IO<B>, onSome: (a: A) => I.IO<B>) => (ma: IOOption<A>) => I.IO<B>

export declare const getOrElse: <A>(onNone: Lazy<I.IO<A>>) => (fa: IOOption<A>) => I.IO<A>

export declare const getOrElseW: <B>(onNone: Lazy<I.IO<B>>) => <A>(ma: IOOption<A>) => I.IO<B | A>

export declare const match: <B, A>(onNone: () => B, onSome: (a: A) => B) => (ma: IOOption<A>) => I.IO<B>

export declare const matchE: <B, A>(onNone: () => I.IO<B>, onSome: (a: A) => I.IO<B>) => (ma: IOOption<A>) => I.IO<B>

export declare const matchEW: <B, C, A>(
  onNone: () => I.IO<B>,
  onSome: (a: A) => I.IO<C>
) => (ma: IOOption<A>) => I.IO<B | C>

export declare const matchW: <B, A, C>(onNone: () => B, onSome: (a: A) => C) => (ma: IOOption<A>) => I.IO<B | C>

export declare const toNullable: <A>(ma: IOOption<A>) => I.IO<A | null>

export declare const toUndefined: <A>(ma: IOOption<A>) => I.IO<A | undefined>

export declare const Alt: Alt1<'IOOption'>

export declare const Alternative: Alternative1<'IOOption'>

export declare const Applicative: Applicative1<'IOOption'>

export declare const Apply: Apply1<'IOOption'>

export declare const Chain: Chain1<'IOOption'>

export declare const Compactable: Compactable1<'IOOption'>

export declare const Filterable: Filterable1<'IOOption'>

export declare const FromEither: FromEither1<'IOOption'>

export declare const FromIO: FromIO1<'IOOption'>

export declare const Functor: Functor1<'IOOption'>

export declare const Monad: Monad1<'IOOption'>

export declare const MonadIO: MonadIO1<'IOOption'>

export declare const Pointed: Pointed1<'IOOption'>

export type URI = typeof URI

export declare const Zero: Zero1<'IOOption'>

export declare const chainNullableK: <A, B>(
  f: (a: A) => B | null | undefined
) => (ma: IOOption<A>) => IOOption<NonNullable<B>>

export declare const fromNullable: <A>(a: A) => IOOption<NonNullable<A>>

export declare const fromNullableK: <A extends readonly unknown[], B>(
  f: (...a: A) => B | null | undefined
) => (...a: A) => IOOption<NonNullable<B>>

export interface IOOption<A> extends IO<Option<A>> {}

export declare const fromEither: NaturalTransformation21<'Either', 'IOOption'>

export declare const fromIO: NaturalTransformation11<'IO', 'IOOption'>

export declare const fromIOEither: NaturalTransformation21<'IOEither', 'IOOption'>

export declare const fromOption: NaturalTransformation11<'Option', 'IOOption'>

export declare const ApT: IOOption<readonly []>

export declare const Do: IOOption<{}>

export declare const apS: <N, A, B>(
  name: Exclude<N, keyof A>,
  fb: IOOption<B>
) => (fa: IOOption<A>) => IOOption<{ readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>

export declare const bind: <N, A, B>(
  name: Exclude<N, keyof A>,
  f: (a: A) => IOOption<B>
) => (ma: IOOption<A>) => IOOption<{ readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>

export declare const bindTo: <N>(name: N) => <A>(fa: IOOption<A>) => IOOption<{ readonly [K in N]: A }>

export declare const traverseReadonlyArrayWithIndex: <A, B>(
  f: (index: number, a: A) => IOOption<B>
) => (as: readonly A[]) => IOOption<readonly B[]>

export declare const traverseReadonlyNonEmptyArrayWithIndex: <A, B>(
  f: (index: number, a: A) => IOOption<B>
) => (as: ReadonlyNonEmptyArray<A>) => IOOption<ReadonlyNonEmptyArray<B>>