export declare const get: <S>() => State<S, S>

export declare const gets: <S, A>(f: (s: S) => A) => State<S, A>

export declare const modify: <S>(f: (s: S) => S) => State<S, void>

export declare const of: <S, A>(a: A) => State<S, A>

export declare const put: <S>(s: S) => State<S, void>

export declare const Applicative: Applicative2<'State'>

export declare const Apply: Apply2<'State'>

export declare const Chain: Chain2<'State'>

export declare const FromState: FromState2<'State'>

export declare const Functor: Functor2<'State'>

export declare const Monad: Monad2<'State'>

export declare const Pointed: Pointed2<'State'>

export declare const flap: <A>(a: A) => <E, B>(fab: State<E, (a: A) => B>) => State<E, B>

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

export interface State<S, A> {
  (s: S): [A, S]
}

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

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

export declare const flatten: <E, A>(mma: State<E, State<E, A>>) => State<E, A>

export declare const sequenceArray: <S, A>(arr: readonly State<S, A>[]) => State<S, readonly A[]>

export declare const traverseArray: <A, S, B>(f: (a: A) => State<S, B>) => (as: readonly A[]) => State<S, readonly B[]>

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

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

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

export declare const URI: 'State'

export type URI = typeof URI

export declare const ap: <E, A>(fa: State<E, A>) => <B>(fab: State<E, (a: A) => B>) => State<E, B>

export declare const apFirst: <E, B>(second: State<E, B>) => <A>(first: State<E, A>) => State<E, A>

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

export declare const apSecond: <E, B>(second: State<E, B>) => <A>(first: State<E, A>) => State<E, B>

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

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

export declare const evaluate: <S>(s: S) => <A>(ma: State<S, A>) => A

export declare const execute: <S>(s: S) => <A>(ma: State<S, A>) => S

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

export declare const evalState: <S, A>(ma: State<S, A>, s: S) => A

export declare const execState: <S, A>(ma: State<S, A>, s: S) => S

export declare const state: Monad2<'State'>