export declare const alt: <A>(that: () => TaskOption<A>) => (fa: TaskOption<A>) => TaskOption<A>

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

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

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

export declare const apFirst: <B>(fb: TaskOption<B>) => <A>(fa: TaskOption<A>) => TaskOption<A>

export declare const apSecond: <B>(fb: TaskOption<B>) => <A>(fa: TaskOption<A>) => TaskOption<B>

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

export declare const separate: <A, B>(ma: TaskOption<Either<A, B>>) => Separated<TaskOption<A>, TaskOption<B>>

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

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

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

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

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

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

export declare const chainFirst: <A, B>(f: (a: A) => TaskOption<B>) => (ma: TaskOption<A>) => TaskOption<A>

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

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

export declare const chainTask: <A, B>(f: (a: A) => Task<B>) => (ma: TaskOption<A>) => TaskOption<B>

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

export declare const mapNullable: <A, B>(f: (a: A) => B | null | undefined) => (ma: TaskOption<A>) => TaskOption<B>

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

export declare const fromOption: <A>(ma: O.Option<A>) => TaskOption<A>

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

export declare const fromTask: <A>(as: Task<A>) => TaskOption<A>

export declare const fromTaskEither: <A>(ma: TaskEither<any, A>) => TaskOption<A>

export declare const none: TaskOption<never>

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

export declare const tryCatch: <A>(f: Lazy<Promise<A>>) => TaskOption<A>

export declare const fold: <A, B>(onNone: () => Task<B>, onSome: (a: A) => Task<B>) => (as: TaskOption<A>) => Task<B>

export declare const getOrElse: <A>(onNone: () => Task<A>) => (as: TaskOption<A>) => Task<A>

export declare const toNullable: <A>(ma: TaskOption<A>) => Task<A | null>

export declare const toUndefined: <A>(ma: TaskOption<A>) => Task<A | undefined>

export declare const Alternative: Alternative1<'TaskOption'>

export declare const Applicative: Applicative1<'TaskOption'>

export declare const Apply: Apply1<'TaskOption'>

export declare const Compactable: Compactable1<'TaskOption'>

export declare const Filterable: Filterable1<'TaskOption'>

export declare const Functor: Functor1<'TaskOption'>

export declare const Monad: Monad1<'TaskOption'>

export type URI = typeof URI

export declare const taskOption: Monad1<'TaskOption'> & Alternative1<'TaskOption'> & Filterable1<'TaskOption'>

export interface TaskOption<A> extends Task<O.Option<A>> {}