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ReaderTask.ts
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ReaderTask.ts
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/**
* @since 2.3.0
*/
import { Applicative2, getApplicativeMonoid } from './Applicative'
import {
apFirst as apFirst_,
Apply2,
apS as apS_,
apSecond as apSecond_,
getApplySemigroup as getApplySemigroup_
} from './Apply'
import * as chainable from './Chain'
import { chainIOK as chainIOK_, FromIO2, fromIOK as fromIOK_, tapIO as tapIO_ } from './FromIO'
import {
ask as ask_,
asks as asks_,
chainReaderK as chainReaderK_,
FromReader2,
fromReaderK as fromReaderK_,
tapReader as tapReader_
} from './FromReader'
import { chainTaskK as chainTaskK_, FromTask2, fromTaskK as fromTaskK_, tapTask as tapTask_ } from './FromTask'
import { dual, flow, identity, pipe, SK } from './function'
import { as as as_, asUnit as asUnit_, bindTo as bindTo_, flap as flap_, Functor2, let as let__ } from './Functor'
import * as _ from './internal'
import { IO } from './IO'
import { Monad2 } from './Monad'
import { MonadIO2 } from './MonadIO'
import { MonadTask2 } from './MonadTask'
import { Monoid } from './Monoid'
import { Pointed2 } from './Pointed'
import * as R from './Reader'
import * as RIO from './ReaderIO'
import * as RT from './ReaderT'
import { ReadonlyNonEmptyArray } from './ReadonlyNonEmptyArray'
import { Semigroup } from './Semigroup'
import * as T from './Task'
// -------------------------------------------------------------------------------------
// model
// -------------------------------------------------------------------------------------
import ReaderIO = RIO.ReaderIO
import Task = T.Task
/**
* @category model
* @since 2.3.0
*/
export interface ReaderTask<R, A> {
(r: R): Task<A>
}
// -------------------------------------------------------------------------------------
// conversions
// -------------------------------------------------------------------------------------
/**
* @category conversions
* @since 2.3.0
*/
export const fromReader: <R, A>(fa: R.Reader<R, A>) => ReaderTask<R, A> = /*#__PURE__*/ RT.fromReader(T.Pointed)
/**
* @category conversions
* @since 2.3.0
*/
export const fromTask: <A, R = unknown>(fa: Task<A>) => ReaderTask<R, A> = /*#__PURE__*/ R.of
/**
* @category conversions
* @since 2.3.0
*/
export const fromIO: <A, R = unknown>(fa: IO<A>) => ReaderTask<R, A> = /*#__PURE__*/ flow(T.fromIO, fromTask)
/**
* @category conversions
* @since 2.13.0
*/
export const fromReaderIO: <R, A>(fa: ReaderIO<R, A>) => ReaderTask<R, A> = R.map(T.fromIO)
// -------------------------------------------------------------------------------------
// combinators
// -------------------------------------------------------------------------------------
/**
* Changes the value of the local context during the execution of the action `ma` (similar to `Contravariant`'s
* `contramap`).
*
* @since 2.3.0
*/
export const local: <R2, R1>(f: (r2: R2) => R1) => <A>(ma: ReaderTask<R1, A>) => ReaderTask<R2, A> = R.local
/**
* Less strict version of [`asksReaderTask`](#asksreadertask).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category constructors
* @since 2.11.0
*/
export const asksReaderTaskW: <R1, R2, A>(f: (r1: R1) => ReaderTask<R2, A>) => ReaderTask<R1 & R2, A> = R.asksReaderW
/**
* Effectfully accesses the environment.
*
* @category constructors
* @since 2.11.0
*/
export const asksReaderTask: <R, A>(f: (r: R) => ReaderTask<R, A>) => ReaderTask<R, A> = asksReaderTaskW
const _map: Functor2<URI>['map'] = (fa, f) => pipe(fa, map(f))
const _apPar: Apply2<URI>['ap'] = (fab, fa) => pipe(fab, ap(fa))
const _apSeq: Apply2<URI>['ap'] = (fab, fa) => flatMap(fab, (f) => pipe(fa, map(f)))
/**
* `map` can be used to turn functions `(a: A) => B` into functions `(fa: F<A>) => F<B>` whose argument and return types
* use the type constructor `F` to represent some computational context.
*
* @category mapping
* @since 2.3.0
*/
export const map: <A, B>(f: (a: A) => B) => <R>(fa: ReaderTask<R, A>) => ReaderTask<R, B> = /*#__PURE__*/ RT.map(
T.Functor
)
/**
* @since 2.3.0
*/
export const ap: <R, A>(fa: ReaderTask<R, A>) => <B>(fab: ReaderTask<R, (a: A) => B>) => ReaderTask<R, B> =
/*#__PURE__*/ RT.ap(T.ApplyPar)
/**
* Less strict version of [`ap`](#ap).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @since 2.8.0
*/
export const apW: <R2, A>(
fa: ReaderTask<R2, A>
) => <R1, B>(fab: ReaderTask<R1, (a: A) => B>) => ReaderTask<R1 & R2, B> = ap as any
/**
* @category constructors
* @since 2.3.0
*/
export const of: <R = unknown, A = never>(a: A) => ReaderTask<R, A> = /*#__PURE__*/ RT.of(T.Pointed)
/**
* @category sequencing
* @since 2.14.0
*/
export const flatMap: {
<A, R2, B>(f: (a: A) => ReaderTask<R2, B>): <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>
<R1, A, R2, B>(ma: ReaderTask<R1, A>, f: (a: A) => ReaderTask<R2, B>): ReaderTask<R1 & R2, B>
} = /*#__PURE__*/ dual(2, RT.flatMap(T.Monad))
/**
* Less strict version of [`flatten`](#flatten).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category sequencing
* @since 2.11.0
*/
export const flattenW: <R1, R2, A>(mma: ReaderTask<R1, ReaderTask<R2, A>>) => ReaderTask<R1 & R2, A> =
/*#__PURE__*/ flatMap(identity)
/**
* @category sequencing
* @since 2.3.0
*/
export const flatten: <R, A>(mma: ReaderTask<R, ReaderTask<R, A>>) => ReaderTask<R, A> = flattenW
/**
* @category type lambdas
* @since 2.3.0
*/
export const URI = 'ReaderTask'
/**
* @category type lambdas
* @since 2.3.0
*/
export type URI = typeof URI
declare module './HKT' {
interface URItoKind2<E, A> {
readonly [URI]: ReaderTask<E, A>
}
}
/**
* @category instances
* @since 2.7.0
*/
export const Functor: Functor2<URI> = {
URI,
map: _map
}
/**
* Maps the value to the specified constant value.
*
* @category mapping
* @since 2.16.0
*/
export const as: {
<R, A, _>(self: ReaderTask<R, _>, a: A): ReaderTask<R, A>
<A>(a: A): <R, _>(self: ReaderTask<R, _>) => ReaderTask<R, A>
} = dual(2, as_(Functor))
/**
* Maps the value to the void constant value.
*
* @category mapping
* @since 2.16.0
*/
export const asUnit: <R, _>(self: ReaderTask<R, _>) => ReaderTask<R, void> = asUnit_(Functor)
/**
* @category mapping
* @since 2.10.0
*/
export const flap = /*#__PURE__*/ flap_(Functor)
/**
* @category instances
* @since 2.10.0
*/
export const Pointed: Pointed2<URI> = {
URI,
of
}
/**
* Runs computations in parallel.
*
* @category instances
* @since 2.10.0
*/
export const ApplyPar: Apply2<URI> = {
URI,
map: _map,
ap: _apPar
}
/**
* Combine two effectful actions, keeping only the result of the first.
*
* @since 2.3.0
*/
export const apFirst = /*#__PURE__*/ apFirst_(ApplyPar)
/**
* Combine two effectful actions, keeping only the result of the second.
*
* @since 2.3.0
*/
export const apSecond = /*#__PURE__*/ apSecond_(ApplyPar)
/**
* Runs computations in parallel.
*
* @category instances
* @since 2.7.0
*/
export const ApplicativePar: Applicative2<URI> = {
URI,
map: _map,
ap: _apPar,
of
}
/**
* Runs computations sequentially.
*
* @category instances
* @since 2.10.0
*/
export const ApplySeq: Apply2<URI> = {
URI,
map: _map,
ap: _apSeq
}
/**
* Runs computations sequentially.
*
* @category instances
* @since 2.7.0
*/
export const ApplicativeSeq: Applicative2<URI> = {
URI,
map: _map,
ap: _apSeq,
of
}
/**
* @category instances
* @since 2.10.0
*/
export const Chain: chainable.Chain2<URI> = {
URI,
map: _map,
ap: _apPar,
chain: flatMap
}
/**
* @category instances
* @since 2.10.0
*/
export const Monad: Monad2<URI> = {
URI,
map: _map,
of,
ap: _apPar,
chain: flatMap
}
/**
* @category instances
* @since 2.10.0
*/
export const MonadIO: MonadIO2<URI> = {
URI,
map: _map,
of,
ap: _apPar,
chain: flatMap,
fromIO
}
/**
* @category instances
* @since 2.10.0
*/
export const MonadTask: MonadTask2<URI> = {
URI,
map: _map,
of,
ap: _apPar,
chain: flatMap,
fromIO,
fromTask
}
/**
* @category instances
* @since 2.10.0
*/
export const FromIO: FromIO2<URI> = {
URI,
fromIO
}
/**
* @category instances
* @since 2.10.0
*/
export const FromTask: FromTask2<URI> = {
URI,
fromIO,
fromTask
}
/**
* @category instances
* @since 2.11.0
*/
export const FromReader: FromReader2<URI> = {
URI,
fromReader
}
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @category combinators
* @since 2.15.0
*/
export const tap: {
<R1, A, R2, _>(self: ReaderTask<R1, A>, f: (a: A) => ReaderTask<R2, _>): ReaderTask<R1 & R2, A>
<A, R2, _>(f: (a: A) => ReaderTask<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R2 & R1, A>
} = /*#__PURE__*/ dual(2, chainable.tap(Chain))
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as RT from 'fp-ts/ReaderTask'
* import * as Console from 'fp-ts/Console'
*
* // Will produce `Hello, fp-ts` to the stdout
* const effect = pipe(
* RT.ask<string>(),
* RT.tapIO((value) => Console.log(`Hello, ${value}`)),
* )
*
* async function test() {
* assert.deepStrictEqual(await effect('fp-ts')(), 'fp-ts')
* }
*
* test()
*
* @category combinators
* @since 2.16.0
*/
export const tapIO: {
<R, A, _>(self: ReaderTask<R, A>, f: (a: A) => IO<_>): ReaderTask<R, A>
<A, _>(f: (a: A) => IO<_>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, A>
} = /*#__PURE__*/ dual(2, tapIO_(FromIO, Chain))
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @category combinators
* @since 2.16.0
*/
export const tapReader: {
<R1, R2, A, _>(self: ReaderTask<R1, A>, f: (a: A) => R.Reader<R2, _>): ReaderTask<R1 & R2, A>
<R2, A, _>(f: (a: A) => R.Reader<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>
} = /*#__PURE__*/ dual(2, tapReader_(FromReader, Chain))
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @example
* import { pipe } from 'fp-ts/function'
* import * as RT from 'fp-ts/ReaderTask'
* import * as T from 'fp-ts/Task'
*
* const effect = pipe(
* RT.ask<number>(),
* RT.tapTask((value) => T.of(value + 1)),
* )
*
* async function test() {
* assert.deepStrictEqual(await effect(1)(), 1)
* }
*
* test()
*
* @category combinators
* @since 2.16.0
*/
export const tapTask: {
<R, A, _>(self: ReaderTask<R, A>, f: (a: A) => Task<_>): ReaderTask<R, A>
<A, _>(f: (a: A) => Task<_>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, A>
} = /*#__PURE__*/ dual(2, tapTask_(FromTask, Chain))
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation and
* keeping only the result of the first.
*
* @category combinators
* @since 2.16.0
*/
export const tapReaderIO: {
<R1, R2, A, _>(self: ReaderTask<R1, A>, f: (a: A) => ReaderIO<R2, _>): ReaderTask<R1 & R2, A>
<R2, A, _>(f: (a: A) => ReaderIO<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>
} = /*#__PURE__*/ dual(
2,
<R1, R2, A, _>(self: ReaderTask<R1, A>, f: (a: A) => ReaderIO<R2, _>): ReaderTask<R1 & R2, A> =>
tap(self, fromReaderIOK(f))
)
/**
* @category lifting
* @since 2.4.0
*/
export const fromIOK: <A extends ReadonlyArray<unknown>, B>(
f: (...a: A) => IO<B>
) => <R = unknown>(...a: A) => ReaderTask<R, B> = /*#__PURE__*/ fromIOK_(FromIO)
/**
* @category sequencing
* @since 2.4.0
*/
export const chainIOK: <A, B>(f: (a: A) => IO<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, B> =
/*#__PURE__*/ chainIOK_(FromIO, Chain)
/**
* Alias of `tapIO`.
*
* @category legacy
* @since 2.10.0
*/
export const chainFirstIOK: <A, B>(f: (a: A) => IO<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, A> = tapIO
/**
* Reads the current context.
*
* @category constructors
* @since 2.3.0
*/
export const ask = /*#__PURE__*/ ask_(FromReader)
/**
* Projects a value from the global context in a `ReaderTask`.
*
* @category constructors
* @since 2.3.0
*/
export const asks = /*#__PURE__*/ asks_(FromReader)
/**
* @category lifting
* @since 2.11.0
*/
export const fromReaderK: <A extends ReadonlyArray<unknown>, R, B>(
f: (...a: A) => R.Reader<R, B>
) => (...a: A) => ReaderTask<R, B> = /*#__PURE__*/ fromReaderK_(FromReader)
/**
* @category sequencing
* @since 2.11.0
*/
export const chainReaderK: <A, R, B>(f: (a: A) => R.Reader<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, B> =
/*#__PURE__*/ chainReaderK_(FromReader, Chain)
/**
* Less strict version of [`chainReaderK`](#chainreaderk).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category sequencing
* @since 2.11.0
*/
export const chainReaderKW: <A, R1, B>(
f: (a: A) => R.Reader<R1, B>
) => <R2>(ma: ReaderTask<R2, A>) => ReaderTask<R1 & R2, B> = chainReaderK as any
/**
* Alias of `tapReader`.
*
* @category legacy
* @since 2.11.0
*/
export const chainFirstReaderK: <A, R, B>(f: (a: A) => R.Reader<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, A> =
tapReader
/**
* Alias of `tapReader`.
*
* Less strict version of [`chainFirstReaderK`](#chainfirstreaderk).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category legacy
* @since 2.11.0
*/
export const chainFirstReaderKW: <A, R1, B>(
f: (a: A) => R.Reader<R1, B>
) => <R2>(ma: ReaderTask<R2, A>) => ReaderTask<R1 & R2, A> = tapReader
/**
* @category lifting
* @since 2.13.0
*/
export const fromReaderIOK =
<A extends ReadonlyArray<unknown>, R, B>(f: (...a: A) => ReaderIO<R, B>): ((...a: A) => ReaderTask<R, B>) =>
(...a) =>
fromReaderIO(f(...a))
/**
* Less strict version of [`chainReaderIOK`](#chainreaderiok).
*
* @category sequencing
* @since 2.13.0
*/
export const chainReaderIOKW: <A, R2, B>(
f: (a: A) => ReaderIO<R2, B>
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B> = (f) => flatMap(fromReaderIOK(f))
/**
* @category sequencing
* @since 2.13.0
*/
export const chainReaderIOK: <A, R, B>(f: (a: A) => ReaderIO<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, B> =
chainReaderIOKW
/**
* Less strict version of [`chainFirstReaderIOK`](#chainfirstreaderiok).
*
* @category sequencing
* @since 2.13.0
*/
export const chainFirstReaderIOKW: <A, R2, B>(
f: (a: A) => ReaderIO<R2, B>
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A> = (f) => chainFirstW(fromReaderIOK(f))
/**
* @category sequencing
* @since 2.13.0
*/
export const chainFirstReaderIOK: <A, R, B>(f: (a: A) => ReaderIO<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, A> =
chainFirstReaderIOKW
/**
* @category lifting
* @since 2.4.0
*/
export const fromTaskK: <A extends ReadonlyArray<unknown>, B>(
f: (...a: A) => T.Task<B>
) => <R = unknown>(...a: A) => ReaderTask<R, B> = /*#__PURE__*/ fromTaskK_(FromTask)
/**
* @category sequencing
* @since 2.4.0
*/
export const chainTaskK: <A, B>(f: (a: A) => T.Task<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, B> =
/*#__PURE__*/ chainTaskK_(FromTask, Chain)
/**
* Alias of `tapTask`.
* @category legacy
* @since 2.10.0
*/
export const chainFirstTaskK: <A, B>(f: (a: A) => T.Task<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, A> =
tapTask
// -------------------------------------------------------------------------------------
// do notation
// -------------------------------------------------------------------------------------
/**
* @category do notation
* @since 2.9.0
*/
export const Do: ReaderTask<unknown, {}> = /*#__PURE__*/ of(_.emptyRecord)
/**
* @category do notation
* @since 2.8.0
*/
export const bindTo = /*#__PURE__*/ bindTo_(Functor)
const let_ = /*#__PURE__*/ let__(Functor)
export {
/**
* @category do notation
* @since 2.13.0
*/
let_ as let
}
/**
* @category do notation
* @since 2.8.0
*/
export const bind = /*#__PURE__*/ chainable.bind(Chain)
/**
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category do notation
* @since 2.8.0
*/
export const bindW: <N extends string, A, R2, B>(
name: Exclude<N, keyof A>,
f: (a: A) => ReaderTask<R2, B>
) => <R1>(fa: ReaderTask<R1, A>) => ReaderTask<R1 & R2, { readonly [K in keyof A | N]: K extends keyof A ? A[K] : B }> =
bind as any
/**
* @category do notation
* @since 2.8.0
*/
export const apS = /*#__PURE__*/ apS_(ApplyPar)
/**
* Less strict version of [`apS`](#aps).
*
* The `W` suffix (short for **W**idening) means that the environment types will be merged.
*
* @category do notation
* @since 2.8.0
*/
export const apSW: <A, N extends string, R2, B>(
name: Exclude<N, keyof A>,
fb: ReaderTask<R2, B>
) => <R1>(fa: ReaderTask<R1, A>) => ReaderTask<R1 & R2, { readonly [K in keyof A | N]: K extends keyof A ? A[K] : B }> =
apS as any
/**
* @since 2.11.0
*/
export const ApT: ReaderTask<unknown, readonly []> = /*#__PURE__*/ of(_.emptyReadonlyArray)
// -------------------------------------------------------------------------------------
// array utils
// -------------------------------------------------------------------------------------
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
export const traverseReadonlyNonEmptyArrayWithIndex = <A, R, B>(
f: (index: number, a: A) => ReaderTask<R, B>
): ((as: ReadonlyNonEmptyArray<A>) => ReaderTask<R, ReadonlyNonEmptyArray<B>>) =>
flow(R.traverseReadonlyNonEmptyArrayWithIndex(f), R.map(T.traverseReadonlyNonEmptyArrayWithIndex(SK)))
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
export const traverseReadonlyArrayWithIndex = <A, R, B>(
f: (index: number, a: A) => ReaderTask<R, B>
): ((as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>) => {
const g = traverseReadonlyNonEmptyArrayWithIndex(f)
return (as) => (_.isNonEmpty(as) ? g(as) : ApT)
}
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.11.0
*/
export const traverseReadonlyNonEmptyArrayWithIndexSeq = <R, A, B>(
f: (index: number, a: A) => ReaderTask<R, B>
): ((as: ReadonlyNonEmptyArray<A>) => ReaderTask<R, ReadonlyNonEmptyArray<B>>) =>
flow(R.traverseReadonlyNonEmptyArrayWithIndex(f), R.map(T.traverseReadonlyNonEmptyArrayWithIndexSeq(SK)))
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.11.0
*/
export const traverseReadonlyArrayWithIndexSeq = <R, A, B>(
f: (index: number, a: A) => ReaderTask<R, B>
): ((as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>) => {
const g = traverseReadonlyNonEmptyArrayWithIndexSeq(f)
return (as) => (_.isNonEmpty(as) ? g(as) : ApT)
}
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export const traverseArrayWithIndex: <R, A, B>(
f: (index: number, a: A) => ReaderTask<R, B>
) => (as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>> = traverseReadonlyArrayWithIndex
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export const traverseArray = <R, A, B>(
f: (a: A) => ReaderTask<R, B>
): ((as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>) => traverseReadonlyArrayWithIndex((_, a) => f(a))
/**
* Equivalent to `ReadonlyArray#sequence(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export const sequenceArray: <R, A>(arr: ReadonlyArray<ReaderTask<R, A>>) => ReaderTask<R, ReadonlyArray<A>> =
/*#__PURE__*/ traverseArray(identity)
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.10.0
*/
export const traverseSeqArrayWithIndex: <R, A, B>(
f: (index: number, a: A) => ReaderTask<R, B>
) => (as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>> = traverseReadonlyArrayWithIndexSeq
/**
* Equivalent to `ReadonlyArray#traverse(ApplicativeSeq)`.
*
* @category traversing
* @since 2.10.0
*/
export const traverseSeqArray = <R, A, B>(
f: (a: A) => ReaderTask<R, B>
): ((as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>) => traverseReadonlyArrayWithIndexSeq((_, a) => f(a))
// -------------------------------------------------------------------------------------
// legacy
// -------------------------------------------------------------------------------------
/**
* Alias of `flatMap`.
*
* @category legacy
* @since 2.3.0
*/
export const chain: <A, R, B>(f: (a: A) => ReaderTask<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, B> = flatMap
/**
* Alias of `flatMap`.
*
* @category legacy
* @since 2.6.7
*/
export const chainW: <R2, A, B>(
f: (a: A) => ReaderTask<R2, B>
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B> = flatMap
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.3.0
*/
export const chainFirst: <A, R, B>(f: (a: A) => ReaderTask<R, B>) => (first: ReaderTask<R, A>) => ReaderTask<R, A> = tap
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.11.0
*/
export const chainFirstW: <R2, A, B>(
f: (a: A) => ReaderTask<R2, B>
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A> = tap
// -------------------------------------------------------------------------------------
// deprecated
// -------------------------------------------------------------------------------------
/**
* Use `traverseReadonlyArrayWithIndexSeq` instead.
*
* @category zone of death
* @since 2.10.0
* @deprecated
*/
export const sequenceSeqArray: <R, A>(arr: ReadonlyArray<ReaderTask<R, A>>) => ReaderTask<R, ReadonlyArray<A>> =
/*#__PURE__*/ traverseSeqArray(identity)
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `RT.Functor` instead of `RT.readerTask`
* (where `RT` is from `import RT from 'fp-ts/ReaderTask'`)
*
* @category zone of death
* @since 2.3.0
* @deprecated
*/
export const readerTask: MonadTask2<URI> = {
URI,
map: _map,
of,
ap: _apPar,
chain: flatMap,
fromIO,
fromTask
}
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `RT.Functor` instead of `RT.readerTaskSeq`
* (where `RT` is from `import RT from 'fp-ts/ReaderTask'`)
*
* @category zone of death
* @since 2.3.0
* @deprecated
*/
export const readerTaskSeq: typeof readerTask = {
URI,
map: _map,
of,
ap: _apSeq,
chain: flatMap,
fromIO,
fromTask
}
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* @category zone of death
* @since 2.3.0
* @deprecated
*/
export const getSemigroup: <R, A>(S: Semigroup<A>) => Semigroup<ReaderTask<R, A>> =
/*#__PURE__*/ getApplySemigroup_(ApplySeq)
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* @category zone of death
* @since 2.3.0
* @deprecated
*/
export const getMonoid: <R, A>(M: Monoid<A>) => Monoid<ReaderTask<R, A>> =
/*#__PURE__*/ getApplicativeMonoid(ApplicativeSeq)
/**
* @category zone of death
* @since 2.4.0
* @deprecated
*/
/* istanbul ignore next */
export function run<R, A>(ma: ReaderTask<R, A>, r: R): Promise<A> {
return ma(r)()
}