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Просмотр файла: Task.js
/**
* ```ts
* interface Task<A> {
* (): Promise<A>
* }
* ```
*
* `Task<A>` represents an asynchronous computation that yields a value of type `A` and **never fails**.
* If you want to represent an asynchronous computation that may fail, please see `TaskEither`.
*
* @since 2.0.0
*/
import { getApplicativeMonoid } from './Applicative';
import { apFirst as apFirst_, apS as apS_, apSecond as apSecond_, getApplySemigroup as getApplySemigroup_ } from './Apply';
import * as chainable from './Chain';
import { fromIOK as fromIOK_, tapIO as tapIO_ } from './FromIO';
import { dual, identity, pipe } from './function';
import { as as as_, asUnit as asUnit_, bindTo as bindTo_, flap as flap_, let as let__ } from './Functor';
import * as _ from './internal';
// -------------------------------------------------------------------------------------
// conversions
// -------------------------------------------------------------------------------------
/**
* @category conversions
* @since 2.0.0
*/
export var fromIO = function (ma) { return function () { return Promise.resolve().then(ma); }; };
// -------------------------------------------------------------------------------------
// combinators
// -------------------------------------------------------------------------------------
/**
* Creates a task that will complete after a time delay
*
* @example
* import { sequenceT } from 'fp-ts/Apply'
* import * as T from 'fp-ts/Task'
* import { takeRight } from 'fp-ts/Array'
*
* async function test() {
* const log: Array<string> = []
* const append = (message: string): T.Task<void> =>
* T.fromIO(() => {
* log.push(message)
* })
* const fa = append('a')
* const fb = T.delay(20)(append('b'))
* const fc = T.delay(10)(append('c'))
* const fd = append('d')
* await sequenceT(T.ApplyPar)(fa, fb, fc, fd)()
* assert.deepStrictEqual(takeRight(2)(log), ['c', 'b'])
* }
*
* test()
*
* @since 2.0.0
*/
export function delay(millis) {
return function (ma) { return function () {
return new Promise(function (resolve) {
setTimeout(function () {
Promise.resolve().then(ma).then(resolve);
}, millis);
});
}; };
}
var _map = function (fa, f) { return pipe(fa, map(f)); };
var _apPar = function (fab, fa) { return pipe(fab, ap(fa)); };
var _apSeq = function (fab, fa) { return flatMap(fab, function (f) { return 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 2.0.0
*/
export var map = function (f) { return function (fa) { return function () {
return Promise.resolve().then(fa).then(f);
}; }; };
/**
* @since 2.0.0
*/
export var ap = function (fa) { return function (fab) { return function () {
return Promise.all([Promise.resolve().then(fab), Promise.resolve().then(fa)]).then(function (_a) {
var f = _a[0], a = _a[1];
return f(a);
});
}; }; };
/**
* @category constructors
* @since 2.0.0
*/
export var of = function (a) { return function () { return Promise.resolve(a); }; };
/**
* @category sequencing
* @since 2.14.0
*/
export var flatMap = /*#__PURE__*/ dual(2, function (ma, f) {
return function () {
return Promise.resolve()
.then(ma)
.then(function (a) { return f(a)(); });
};
});
/**
* @category sequencing
* @since 2.0.0
*/
export var flatten = /*#__PURE__*/ flatMap(identity);
/**
* @category type lambdas
* @since 2.0.0
*/
export var URI = 'Task';
/**
* Monoid returning the first completed task.
*
* Note: uses `Promise.race` internally.
*
* @example
* import * as T from 'fp-ts/Task'
*
* async function test() {
* const S = T.getRaceMonoid<string>()
* const fa = T.delay(20)(T.of('a'))
* const fb = T.delay(10)(T.of('b'))
* assert.deepStrictEqual(await S.concat(fa, fb)(), 'b')
* }
*
* test()
*
* @category instances
* @since 2.0.0
*/
export function getRaceMonoid() {
return {
concat: function (x, y) { return function () { return Promise.race([Promise.resolve().then(x), Promise.resolve().then(y)]); }; },
empty: never
};
}
/**
* @category instances
* @since 2.7.0
*/
export var Functor = {
URI: URI,
map: _map
};
/**
* Maps the value to the specified constant value.
*
* @category mapping
* @since 2.16.0
*/
export var as = dual(2, as_(Functor));
/**
* Maps the value to the void constant value.
*
* @category mapping
* @since 2.16.0
*/
export var asUnit = asUnit_(Functor);
/**
* @category mapping
* @since 2.10.0
*/
export var flap = /*#__PURE__*/ flap_(Functor);
/**
* @category instances
* @since 2.10.0
*/
export var Pointed = {
URI: URI,
of: of
};
/**
* Runs computations in parallel.
*
* @category instances
* @since 2.10.0
*/
export var ApplyPar = {
URI: URI,
map: _map,
ap: _apPar
};
/**
* Combine two effectful actions, keeping only the result of the first.
*
* @since 2.0.0
*/
export var apFirst = /*#__PURE__*/ apFirst_(ApplyPar);
/**
* Combine two effectful actions, keeping only the result of the second.
*
* @since 2.0.0
*/
export var apSecond = /*#__PURE__*/ apSecond_(ApplyPar);
/**
* Runs computations in parallel.
*
* @category instances
* @since 2.7.0
*/
export var ApplicativePar = {
URI: URI,
map: _map,
ap: _apPar,
of: of
};
/**
* Runs computations sequentially.
*
* @category instances
* @since 2.10.0
*/
export var ApplySeq = {
URI: URI,
map: _map,
ap: _apSeq
};
/**
* Runs computations sequentially.
*
* @category instances
* @since 2.7.0
*/
export var ApplicativeSeq = {
URI: URI,
map: _map,
ap: _apSeq,
of: of
};
/**
* @category instances
* @since 2.10.0
*/
export var Chain = {
URI: URI,
map: _map,
ap: _apPar,
chain: flatMap
};
/**
* @category instances
* @since 2.10.0
*/
export var Monad = {
URI: URI,
map: _map,
of: of,
ap: _apPar,
chain: flatMap
};
/**
* @category instances
* @since 2.10.0
*/
export var MonadIO = {
URI: URI,
map: _map,
of: of,
ap: _apPar,
chain: flatMap,
fromIO: fromIO
};
/**
* @category zone of death
* @since 2.7.0
* @deprecated
*/
export var fromTask = identity;
/**
* @category instances
* @since 2.10.0
*/
export var MonadTask = {
URI: URI,
map: _map,
of: of,
ap: _apPar,
chain: flatMap,
fromIO: fromIO,
fromTask: fromTask
};
/**
* @category instances
* @since 2.10.0
*/
export var FromIO = {
URI: URI,
fromIO: fromIO
};
/** @internal */
var _FlatMap = {
flatMap: flatMap
};
/** @internal */
var _FromIO = {
fromIO: FromIO.fromIO
};
/**
* @category sequencing
* @since 2.16.0
*/
export var flatMapIO = _.flatMapIO(_FromIO, _FlatMap);
/**
* 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 var tap = /*#__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 T from 'fp-ts/Task'
* import * as Console from 'fp-ts/Console'
*
* // Will produce `Hello, fp-ts` to the stdout
* const effect = pipe(
* T.of('fp-ts'),
* T.tapIO((value) => Console.log(`Hello, ${value}`)),
* )
*
* async function test() {
* assert.deepStrictEqual(await effect(), 'fp-ts')
* }
*
* test()
*
* @category combinators
* @since 2.16.0
*/
export var tapIO = /*#__PURE__*/ dual(2, tapIO_(FromIO, Chain));
/**
* @category lifting
* @since 2.4.0
*/
export var fromIOK =
/*#__PURE__*/ fromIOK_(FromIO);
/**
* Alias of `flatMapIO`.
*
* @category legacy
* @since 2.4.0
*/
export var chainIOK = flatMapIO;
/**
* Alias of `tapIO`.
*
* @category legacy
* @since 2.10.0
*/
export var chainFirstIOK = tapIO;
/**
* @category instances
* @since 2.10.0
*/
export var FromTask = {
URI: URI,
fromIO: fromIO,
fromTask: fromTask
};
// -------------------------------------------------------------------------------------
// utils
// -------------------------------------------------------------------------------------
/**
* A `Task` that never completes.
*
* @since 2.0.0
*/
export var never = function () { return new Promise(function (_) { return undefined; }); };
// -------------------------------------------------------------------------------------
// do notation
// -------------------------------------------------------------------------------------
/**
* @category do notation
* @since 2.9.0
*/
export var Do = /*#__PURE__*/ of(_.emptyRecord);
/**
* @category do notation
* @since 2.8.0
*/
export var bindTo = /*#__PURE__*/ bindTo_(Functor);
var let_ = /*#__PURE__*/ let__(Functor);
export {
/**
* @category do notation
* @since 2.13.0
*/
let_ as let };
/**
* @category do notation
* @since 2.8.0
*/
export var bind = /*#__PURE__*/ chainable.bind(Chain);
/**
* @category do notation
* @since 2.8.0
*/
export var apS = /*#__PURE__*/ apS_(ApplyPar);
/**
* @since 2.11.0
*/
export var ApT = /*#__PURE__*/ of(_.emptyReadonlyArray);
// -------------------------------------------------------------------------------------
// array utils
// -------------------------------------------------------------------------------------
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(ApplicativePar)`.
*
* @category traversing
* @since 2.11.0
*/
export var traverseReadonlyNonEmptyArrayWithIndex = function (f) {
return function (as) {
return function () {
return Promise.all(as.map(function (a, i) { return Promise.resolve().then(function () { return f(i, a)(); }); }));
};
};
};
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativePar)`.
*
* @category traversing
* @since 2.11.0
*/
export var traverseReadonlyArrayWithIndex = function (f) {
var g = traverseReadonlyNonEmptyArrayWithIndex(f);
return function (as) { return (_.isNonEmpty(as) ? g(as) : ApT); };
};
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.11.0
*/
export var traverseReadonlyNonEmptyArrayWithIndexSeq = function (f) {
return function (as) {
return function () {
return _.tail(as).reduce(function (acc, a, i) {
return acc.then(function (bs) {
return Promise.resolve()
.then(f(i + 1, a))
.then(function (b) {
bs.push(b);
return bs;
});
});
}, Promise.resolve()
.then(f(0, _.head(as)))
.then(_.singleton));
};
};
};
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.11.0
*/
export var traverseReadonlyArrayWithIndexSeq = function (f) {
var g = traverseReadonlyNonEmptyArrayWithIndexSeq(f);
return function (as) { return (_.isNonEmpty(as) ? g(as) : ApT); };
};
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export var traverseArrayWithIndex = traverseReadonlyArrayWithIndex;
/**
* Equivalent to `ReadonlyArray#traverse(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export var traverseArray = function (f) {
return traverseReadonlyArrayWithIndex(function (_, a) { return f(a); });
};
/**
* Equivalent to `ReadonlyArray#sequence(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export var sequenceArray =
/*#__PURE__*/ traverseArray(identity);
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
*
* @category traversing
* @since 2.9.0
*/
export var traverseSeqArrayWithIndex = traverseReadonlyArrayWithIndexSeq;
/**
* Equivalent to `ReadonlyArray#traverse(ApplicativeSeq)`.
*
* @category traversing
* @since 2.9.0
*/
export var traverseSeqArray = function (f) {
return traverseReadonlyArrayWithIndexSeq(function (_, a) { return f(a); });
};
/**
* Equivalent to `ReadonlyArray#sequence(ApplicativeSeq)`.
*
* @category traversing
* @since 2.9.0
*/
export var sequenceSeqArray =
/*#__PURE__*/ traverseSeqArray(identity);
// -------------------------------------------------------------------------------------
// legacy
// -------------------------------------------------------------------------------------
/**
* Alias of `flatMap`.
*
* @category legacy
* @since 2.0.0
*/
export var chain = flatMap;
/**
* Alias of `tap`.
*
* @category legacy
* @since 2.0.0
*/
export var chainFirst = tap;
// -------------------------------------------------------------------------------------
// deprecated
// -------------------------------------------------------------------------------------
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `T.Functor` instead of `T.task`
* (where `T` is from `import T from 'fp-ts/Task'`)
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export var task = {
URI: URI,
map: _map,
of: of,
ap: _apPar,
chain: flatMap,
fromIO: fromIO,
fromTask: fromTask
};
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `T.Functor` instead of `T.taskSeq`
* (where `T` is from `import T from 'fp-ts/Task'`)
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export var taskSeq = {
URI: URI,
map: _map,
of: of,
ap: _apSeq,
chain: flatMap,
fromIO: fromIO,
fromTask: fromTask
};
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export var getSemigroup = /*#__PURE__*/ getApplySemigroup_(ApplySeq);
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* Lift a monoid into 'Task', the inner values are concatenated using the provided `Monoid`.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export var getMonoid = /*#__PURE__*/ getApplicativeMonoid(ApplicativeSeq);
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