Innovenergy_trunk/frontend/node_modules/fp-ts/es6/Option.d.ts

1096 lines
29 KiB
TypeScript

/**
* ```ts
* type Option<A> = None | Some<A>
* ```
*
* `Option<A>` is a container for an optional value of type `A`. If the value of type `A` is present, the `Option<A>` is
* an instance of `Some<A>`, containing the present value of type `A`. If the value is absent, the `Option<A>` is an
* instance of `None`.
*
* An option could be looked at as a collection or foldable structure with either one or zero elements.
* Another way to look at `Option` is: it represents the effect of a possibly failing computation.
*
*
* @example
* import * as O from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* const double = (n: number): number => n * 2
*
* export const imperative = (as: ReadonlyArray<number>): string => {
* const head = (as: ReadonlyArray<number>): number => {
* if (as.length === 0) {
* throw new Error()
* }
* return as[0]
* }
* const inverse = (n: number): number => {
* if (n === 0) {
* throw new Error()
* }
* return 1 / n
* }
* try {
* return `Result is ${inverse(double(head(as)))}`
* } catch (e) {
* return 'no result'
* }
* }
*
* export const functional = (as: ReadonlyArray<number>): string => {
* const head = <A>(as: ReadonlyArray<A>): O.Option<A> =>
* as.length === 0 ? O.none : O.some(as[0])
* const inverse = (n: number): O.Option<number> =>
* n === 0 ? O.none : O.some(1 / n)
* return pipe(
* as,
* head,
* O.map(double),
* O.chain(inverse),
* O.match(
* () => 'no result', // onNone handler
* (head) => `Result is ${head}` // onSome handler
* )
* )
* }
*
* assert.deepStrictEqual(imperative([1, 2, 3]), functional([1, 2, 3]))
* assert.deepStrictEqual(imperative([]), functional([]))
* assert.deepStrictEqual(imperative([0]), functional([0]))
*
* @since 2.0.0
*/
import { Alt1 } from './Alt'
import { Alternative1 } from './Alternative'
import { Applicative1 } from './Applicative'
import { Apply1 } from './Apply'
import { Chain1 } from './Chain'
import { Compactable1 } from './Compactable'
import { Either } from './Either'
import { Eq } from './Eq'
import { Extend1 } from './Extend'
import { Filterable1 } from './Filterable'
import { Foldable1 } from './Foldable'
import { FromEither1 } from './FromEither'
import { Lazy } from './function'
import { Functor1 } from './Functor'
import { Monad1 } from './Monad'
import { MonadThrow1 } from './MonadThrow'
import { Monoid } from './Monoid'
import { Ord } from './Ord'
import { Pointed1 } from './Pointed'
import { Predicate } from './Predicate'
import { ReadonlyNonEmptyArray } from './ReadonlyNonEmptyArray'
import { Refinement } from './Refinement'
import { Semigroup } from './Semigroup'
import { Separated } from './Separated'
import { Show } from './Show'
import { PipeableTraverse1, Traversable1 } from './Traversable'
import { PipeableWilt1, PipeableWither1, Witherable1 } from './Witherable'
import { Zero1 } from './Zero'
/**
* @category model
* @since 2.0.0
*/
export interface None {
readonly _tag: 'None'
}
/**
* @category model
* @since 2.0.0
*/
export interface Some<A> {
readonly _tag: 'Some'
readonly value: A
}
/**
* @category model
* @since 2.0.0
*/
export declare type Option<A> = None | Some<A>
/**
* `None` doesn't have a constructor, instead you can use it directly as a value. Represents a missing value.
*
* @category constructors
* @since 2.0.0
*/
export declare const none: Option<never>
/**
* Constructs a `Some`. Represents an optional value that exists.
*
* @category constructors
* @since 2.0.0
*/
export declare const some: <A>(a: A) => Option<A>
/**
* Returns a *smart constructor* based on the given predicate.
*
* @example
* import { none, some, fromPredicate } from 'fp-ts/Option'
*
* const getOption = fromPredicate((n: number) => n >= 0)
*
* assert.deepStrictEqual(getOption(-1), none)
* assert.deepStrictEqual(getOption(1), some(1))
*
* @category lifting
* @since 2.0.0
*/
export declare function fromPredicate<A, B extends A>(refinement: Refinement<A, B>): (a: A) => Option<B>
export declare function fromPredicate<A>(predicate: Predicate<A>): <B extends A>(b: B) => Option<B>
export declare function fromPredicate<A>(predicate: Predicate<A>): (a: A) => Option<A>
/**
* Returns the `Left` value of an `Either` if possible.
*
* @example
* import { getLeft, none, some } from 'fp-ts/Option'
* import { right, left } from 'fp-ts/Either'
*
* assert.deepStrictEqual(getLeft(right(1)), none)
* assert.deepStrictEqual(getLeft(left('a')), some('a'))
*
* @category constructors
* @since 2.0.0
*/
export declare const getLeft: <E, A>(ma: Either<E, A>) => Option<E>
/**
* Returns the `Right` value of an `Either` if possible.
*
* @example
* import { getRight, none, some } from 'fp-ts/Option'
* import { right, left } from 'fp-ts/Either'
*
* assert.deepStrictEqual(getRight(right(1)), some(1))
* assert.deepStrictEqual(getRight(left('a')), none)
*
* @category constructors
* @since 2.0.0
*/
export declare const getRight: <E, A>(ma: Either<E, A>) => Option<A>
/**
* @category type lambdas
* @since 2.0.0
*/
export declare const URI = 'Option'
/**
* @category type lambdas
* @since 2.0.0
*/
export declare type URI = typeof URI
declare module './HKT' {
interface URItoKind<A> {
readonly [URI]: Option<A>
}
}
/**
* @category instances
* @since 2.0.0
*/
export declare const getShow: <A>(S: Show<A>) => Show<Option<A>>
/**
* @example
* import { none, some, getEq } from 'fp-ts/Option'
* import * as N from 'fp-ts/number'
*
* const E = getEq(N.Eq)
* assert.strictEqual(E.equals(none, none), true)
* assert.strictEqual(E.equals(none, some(1)), false)
* assert.strictEqual(E.equals(some(1), none), false)
* assert.strictEqual(E.equals(some(1), some(2)), false)
* assert.strictEqual(E.equals(some(1), some(1)), true)
*
* @category instances
* @since 2.0.0
*/
export declare const getEq: <A>(E: Eq<A>) => Eq<Option<A>>
/**
* The `Ord` instance allows `Option` values to be compared with
* `compare`, whenever there is an `Ord` instance for
* the type the `Option` contains.
*
* `None` is considered to be less than any `Some` value.
*
*
* @example
* import { none, some, getOrd } from 'fp-ts/Option'
* import * as N from 'fp-ts/number'
*
* const O = getOrd(N.Ord)
* assert.strictEqual(O.compare(none, none), 0)
* assert.strictEqual(O.compare(none, some(1)), -1)
* assert.strictEqual(O.compare(some(1), none), 1)
* assert.strictEqual(O.compare(some(1), some(2)), -1)
* assert.strictEqual(O.compare(some(1), some(1)), 0)
*
* @category instances
* @since 2.0.0
*/
export declare const getOrd: <A>(O: Ord<A>) => Ord<Option<A>>
/**
* Monoid returning the left-most non-`None` value. If both operands are `Some`s then the inner values are
* concatenated using the provided `Semigroup`
*
* | x | y | concat(x, y) |
* | ------- | ------- | ------------------ |
* | none | none | none |
* | some(a) | none | some(a) |
* | none | some(b) | some(b) |
* | some(a) | some(b) | some(concat(a, b)) |
*
* @example
* import { getMonoid, some, none } from 'fp-ts/Option'
* import { SemigroupSum } from 'fp-ts/number'
*
* const M = getMonoid(SemigroupSum)
* assert.deepStrictEqual(M.concat(none, none), none)
* assert.deepStrictEqual(M.concat(some(1), none), some(1))
* assert.deepStrictEqual(M.concat(none, some(1)), some(1))
* assert.deepStrictEqual(M.concat(some(1), some(2)), some(3))
*
* @category instances
* @since 2.0.0
*/
export declare const getMonoid: <A>(S: Semigroup<A>) => Monoid<Option<A>>
/**
* @category mapping
* @since 2.0.0
*/
export declare const map: <A, B>(f: (a: A) => B) => (fa: Option<A>) => Option<B>
/**
* @category instances
* @since 2.7.0
*/
export declare const Functor: Functor1<URI>
/**
* @category constructors
* @since 2.7.0
*/
export declare const of: <A>(a: A) => Option<A>
/**
* @category instances
* @since 2.10.0
*/
export declare const Pointed: Pointed1<URI>
/**
* @since 2.0.0
*/
export declare const ap: <A>(fa: Option<A>) => <B>(fab: Option<(a: A) => B>) => Option<B>
/**
* @category instances
* @since 2.10.0
*/
export declare const Apply: Apply1<URI>
/**
* @category instances
* @since 2.7.0
*/
export declare const Applicative: Applicative1<URI>
/**
* Composes computations in sequence, using the return value of one computation to determine the next computation.
*
* @category sequencing
* @since 2.0.0
*/
export declare const chain: <A, B>(f: (a: A) => Option<B>) => (ma: Option<A>) => Option<B>
/**
* @category instances
* @since 2.10.0
*/
export declare const Chain: Chain1<URI>
/**
* @category instances
* @since 2.7.0
*/
export declare const Monad: Monad1<URI>
/**
* @category folding
* @since 2.0.0
*/
export declare const reduce: <A, B>(b: B, f: (b: B, a: A) => B) => (fa: Option<A>) => B
/**
* @category folding
* @since 2.0.0
*/
export declare const foldMap: <M>(M: Monoid<M>) => <A>(f: (a: A) => M) => (fa: Option<A>) => M
/**
* @category folding
* @since 2.0.0
*/
export declare const reduceRight: <A, B>(b: B, f: (a: A, b: B) => B) => (fa: Option<A>) => B
/**
* @category instances
* @since 2.7.0
*/
export declare const Foldable: Foldable1<URI>
/**
* Less strict version of [`alt`](#alt).
*
* The `W` suffix (short for **W**idening) means that the return types will be merged.
*
* @category error handling
* @since 2.9.0
*/
export declare const altW: <B>(that: Lazy<Option<B>>) => <A>(fa: Option<A>) => Option<A | B>
/**
* Identifies an associative operation on a type constructor. It is similar to `Semigroup`, except that it applies to
* types of kind `* -> *`.
*
* In case of `Option` returns the left-most non-`None` value.
*
* | x | y | pipe(x, alt(() => y) |
* | ------- | ------- | -------------------- |
* | none | none | none |
* | some(a) | none | some(a) |
* | none | some(b) | some(b) |
* | some(a) | some(b) | some(a) |
*
* @example
* import * as O from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.deepStrictEqual(
* pipe(
* O.none,
* O.alt(() => O.none)
* ),
* O.none
* )
* assert.deepStrictEqual(
* pipe(
* O.some('a'),
* O.alt<string>(() => O.none)
* ),
* O.some('a')
* )
* assert.deepStrictEqual(
* pipe(
* O.none,
* O.alt(() => O.some('b'))
* ),
* O.some('b')
* )
* assert.deepStrictEqual(
* pipe(
* O.some('a'),
* O.alt(() => O.some('b'))
* ),
* O.some('a')
* )
*
* @category error handling
* @since 2.0.0
*/
export declare const alt: <A>(that: Lazy<Option<A>>) => (fa: Option<A>) => Option<A>
/**
* @category instances
* @since 2.7.0
*/
export declare const Alt: Alt1<URI>
/**
* @since 2.7.0
*/
export declare const zero: <A>() => Option<A>
/**
* @category instances
* @since 2.11.0
*/
export declare const Zero: Zero1<URI>
/**
* @category do notation
* @since 2.11.0
*/
export declare const guard: (b: boolean) => Option<void>
/**
* @category instances
* @since 2.7.0
*/
export declare const Alternative: Alternative1<URI>
/**
* @since 2.0.0
*/
export declare const extend: <A, B>(f: (wa: Option<A>) => B) => (wa: Option<A>) => Option<B>
/**
* @category instances
* @since 2.7.0
*/
export declare const Extend: Extend1<URI>
/**
* @category filtering
* @since 2.0.0
*/
export declare const compact: <A>(fa: Option<Option<A>>) => Option<A>
/**
* @category filtering
* @since 2.0.0
*/
export declare const separate: <A, B>(ma: Option<Either<A, B>>) => Separated<Option<A>, Option<B>>
/**
* @category instances
* @since 2.7.0
*/
export declare const Compactable: Compactable1<URI>
/**
* @category filtering
* @since 2.0.0
*/
export declare const filter: {
<A, B extends A>(refinement: Refinement<A, B>): (fa: Option<A>) => Option<B>
<A>(predicate: Predicate<A>): <B extends A>(fb: Option<B>) => Option<B>
<A>(predicate: Predicate<A>): (fa: Option<A>) => Option<A>
}
/**
* @category filtering
* @since 2.0.0
*/
export declare const filterMap: <A, B>(f: (a: A) => Option<B>) => (fa: Option<A>) => Option<B>
/**
* @category filtering
* @since 2.0.0
*/
export declare const partition: {
<A, B extends A>(refinement: Refinement<A, B>): (fa: Option<A>) => Separated<Option<A>, Option<B>>
<A>(predicate: Predicate<A>): <B extends A>(fb: Option<B>) => Separated<Option<B>, Option<B>>
<A>(predicate: Predicate<A>): (fa: Option<A>) => Separated<Option<A>, Option<A>>
}
/**
* @category filtering
* @since 2.0.0
*/
export declare const partitionMap: <A, B, C>(
f: (a: A) => Either<B, C>
) => (fa: Option<A>) => Separated<Option<B>, Option<C>>
/**
* @category instances
* @since 2.7.0
*/
export declare const Filterable: Filterable1<URI>
/**
* @category traversing
* @since 2.6.3
*/
export declare const traverse: PipeableTraverse1<URI>
/**
* @category traversing
* @since 2.6.3
*/
export declare const sequence: Traversable1<URI>['sequence']
/**
* @category instances
* @since 2.7.0
*/
export declare const Traversable: Traversable1<URI>
/**
* @category filtering
* @since 2.6.5
*/
export declare const wither: PipeableWither1<URI>
/**
* @category filtering
* @since 2.6.5
*/
export declare const wilt: PipeableWilt1<URI>
/**
* @category instances
* @since 2.7.0
*/
export declare const Witherable: Witherable1<URI>
/**
* @since 2.7.0
*/
export declare const throwError: MonadThrow1<URI>['throwError']
/**
* @category instances
* @since 2.7.0
*/
export declare const MonadThrow: MonadThrow1<URI>
/**
* Transforms an `Either` to an `Option` discarding the error.
*
* Alias of [getRight](#getright)
*
* @category conversions
* @since 2.0.0
*/
export declare const fromEither: <A>(fa: Either<unknown, A>) => Option<A>
/**
* @category instances
* @since 2.11.0
*/
export declare const FromEither: FromEither1<URI>
/**
* Returns `true` if the option is an instance of `Some`, `false` otherwise.
*
* @example
* import { some, none, isSome } from 'fp-ts/Option'
*
* assert.strictEqual(isSome(some(1)), true)
* assert.strictEqual(isSome(none), false)
*
* @category refinements
* @since 2.0.0
*/
export declare const isSome: <A>(fa: Option<A>) => fa is Some<A>
/**
* Returns `true` if the option is `None`, `false` otherwise.
*
* @example
* import { some, none, isNone } from 'fp-ts/Option'
*
* assert.strictEqual(isNone(some(1)), false)
* assert.strictEqual(isNone(none), true)
*
* @category refinements
* @since 2.0.0
*/
export declare const isNone: (fa: Option<unknown>) => fa is None
/**
* Less strict version of [`match`](#match).
*
* The `W` suffix (short for **W**idening) means that the handler return types will be merged.
*
* @category pattern matching
* @since 2.10.0
*/
export declare const matchW: <B, A, C>(onNone: Lazy<B>, onSome: (a: A) => C) => (ma: Option<A>) => B | C
/**
* Alias of [`matchW`](#matchw).
*
* @category pattern matching
* @since 2.10.0
*/
export declare const foldW: <B, A, C>(onNone: Lazy<B>, onSome: (a: A) => C) => (ma: Option<A>) => B | C
/**
* Takes a (lazy) default value, a function, and an `Option` value, if the `Option` value is `None` the default value is
* returned, otherwise the function is applied to the value inside the `Some` and the result is returned.
*
* @example
* import { some, none, match } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.strictEqual(
* pipe(
* some(1),
* match(() => 'a none', a => `a some containing ${a}`)
* ),
* 'a some containing 1'
* )
*
* assert.strictEqual(
* pipe(
* none,
* match(() => 'a none', a => `a some containing ${a}`)
* ),
* 'a none'
* )
*
* @category pattern matching
* @since 2.10.0
*/
export declare const match: <A, B>(onNone: Lazy<B>, onSome: (a: A) => B) => (ma: Option<A>) => B
/**
* Alias of [`match`](#match).
*
* @category pattern matching
* @since 2.0.0
*/
export declare const fold: <A, B>(onNone: Lazy<B>, onSome: (a: A) => B) => (ma: Option<A>) => B
/**
* Less strict version of [`getOrElse`](#getorelse).
*
* The `W` suffix (short for **W**idening) means that the handler return type will be merged.
*
* @category error handling
* @since 2.6.0
*/
export declare const getOrElseW: <B>(onNone: Lazy<B>) => <A>(ma: Option<A>) => B | A
/**
* Extracts the value out of the structure, if it exists. Otherwise returns the given default value
*
* @example
* import { some, none, getOrElse } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.strictEqual(
* pipe(
* some(1),
* getOrElse(() => 0)
* ),
* 1
* )
* assert.strictEqual(
* pipe(
* none,
* getOrElse(() => 0)
* ),
* 0
* )
*
* @category error handling
* @since 2.0.0
*/
export declare const getOrElse: <A>(onNone: Lazy<A>) => (ma: Option<A>) => A
/**
* @category mapping
* @since 2.10.0
*/
export declare const flap: <A>(a: A) => <B>(fab: Option<(a: A) => B>) => Option<B>
/**
* Combine two effectful actions, keeping only the result of the first.
*
* @since 2.0.0
*/
export declare const apFirst: <B>(second: Option<B>) => <A>(first: Option<A>) => Option<A>
/**
* Combine two effectful actions, keeping only the result of the second.
*
* @since 2.0.0
*/
export declare const apSecond: <B>(second: Option<B>) => <A>(first: Option<A>) => Option<B>
/**
* @category sequencing
* @since 2.0.0
*/
export declare const flatten: <A>(mma: Option<Option<A>>) => Option<A>
/**
* 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 sequencing
* @since 2.0.0
*/
export declare const chainFirst: <A, B>(f: (a: A) => Option<B>) => (first: Option<A>) => Option<A>
/**
* @since 2.0.0
*/
export declare const duplicate: <A>(ma: Option<A>) => Option<Option<A>>
/**
* @category lifting
* @since 2.11.0
*/
export declare const fromEitherK: <E, A extends ReadonlyArray<unknown>, B>(
f: (...a: A) => Either<E, B>
) => (...a: A) => Option<B>
/**
* @category sequencing
* @since 2.11.0
*/
export declare const chainEitherK: <E, A, B>(f: (a: A) => Either<E, B>) => (ma: Option<A>) => Option<B>
/**
* @category sequencing
* @since 2.12.0
*/
export declare const chainFirstEitherK: <E, A, B>(f: (a: A) => Either<E, B>) => (ma: Option<A>) => Option<A>
/**
* Constructs a new `Option` from a nullable type. If the value is `null` or `undefined`, returns `None`, otherwise
* returns the value wrapped in a `Some`.
*
* @example
* import { none, some, fromNullable } from 'fp-ts/Option'
*
* assert.deepStrictEqual(fromNullable(undefined), none)
* assert.deepStrictEqual(fromNullable(null), none)
* assert.deepStrictEqual(fromNullable(1), some(1))
*
* @category conversions
* @since 2.0.0
*/
export declare const fromNullable: <A>(a: A) => Option<NonNullable<A>>
/**
* Transforms an exception into an `Option`. If `f` throws, returns `None`, otherwise returns the output wrapped in a
* `Some`.
*
* See also [`tryCatchK`](#trycatchk).
*
* @example
* import { none, some, tryCatch } from 'fp-ts/Option'
*
* assert.deepStrictEqual(
* tryCatch(() => {
* throw new Error()
* }),
* none
* )
* assert.deepStrictEqual(tryCatch(() => 1), some(1))
*
* @category interop
* @since 2.0.0
*/
export declare const tryCatch: <A>(f: Lazy<A>) => Option<A>
/**
* Converts a function that may throw to one returning a `Option`.
*
* @category interop
* @since 2.10.0
*/
export declare const tryCatchK: <A extends readonly unknown[], B>(f: (...a: A) => B) => (...a: A) => Option<B>
/**
* Returns a *smart constructor* from a function that returns a nullable value.
*
* @example
* import { fromNullableK, none, some } from 'fp-ts/Option'
*
* const f = (s: string): number | undefined => {
* const n = parseFloat(s)
* return isNaN(n) ? undefined : n
* }
*
* const g = fromNullableK(f)
*
* assert.deepStrictEqual(g('1'), some(1))
* assert.deepStrictEqual(g('a'), none)
*
* @category lifting
* @since 2.9.0
*/
export declare const fromNullableK: <A extends ReadonlyArray<unknown>, B>(
f: (...a: A) => B | null | undefined
) => (...a: A) => Option<NonNullable<B>>
/**
* This is `chain` + `fromNullable`, useful when working with optional values.
*
* @example
* import { some, none, fromNullable, chainNullableK } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* interface Employee {
* readonly company?: {
* readonly address?: {
* readonly street?: {
* readonly name?: string
* }
* }
* }
* }
*
* const employee1: Employee = { company: { address: { street: { name: 'high street' } } } }
*
* assert.deepStrictEqual(
* pipe(
* fromNullable(employee1.company),
* chainNullableK(company => company.address),
* chainNullableK(address => address.street),
* chainNullableK(street => street.name)
* ),
* some('high street')
* )
*
* const employee2: Employee = { company: { address: { street: {} } } }
*
* assert.deepStrictEqual(
* pipe(
* fromNullable(employee2.company),
* chainNullableK(company => company.address),
* chainNullableK(address => address.street),
* chainNullableK(street => street.name)
* ),
* none
* )
*
* @category sequencing
* @since 2.9.0
*/
export declare const chainNullableK: <A, B>(
f: (a: A) => B | null | undefined
) => (ma: Option<A>) => Option<NonNullable<B>>
/**
* Extracts the value out of the structure, if it exists. Otherwise returns `null`.
*
* @example
* import { some, none, toNullable } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.strictEqual(
* pipe(
* some(1),
* toNullable
* ),
* 1
* )
* assert.strictEqual(
* pipe(
* none,
* toNullable
* ),
* null
* )
*
* @category conversions
* @since 2.0.0
*/
export declare const toNullable: <A>(ma: Option<A>) => A | null
/**
* Extracts the value out of the structure, if it exists. Otherwise returns `undefined`.
*
* @example
* import { some, none, toUndefined } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.strictEqual(
* pipe(
* some(1),
* toUndefined
* ),
* 1
* )
* assert.strictEqual(
* pipe(
* none,
* toUndefined
* ),
* undefined
* )
*
* @category conversions
* @since 2.0.0
*/
export declare const toUndefined: <A>(ma: Option<A>) => A | undefined
/**
* Returns `true` if `ma` contains `a`
*
* @example
* import { some, none, elem } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
* import * as N from 'fp-ts/number'
*
* assert.strictEqual(pipe(some(1), elem(N.Eq)(1)), true)
* assert.strictEqual(pipe(some(1), elem(N.Eq)(2)), false)
* assert.strictEqual(pipe(none, elem(N.Eq)(1)), false)
*
* @since 2.0.0
*/
export declare function elem<A>(E: Eq<A>): {
(a: A): (ma: Option<A>) => boolean
(a: A, ma: Option<A>): boolean
}
/**
* Returns `true` if the predicate is satisfied by the wrapped value
*
* @example
* import { some, none, exists } from 'fp-ts/Option'
* import { pipe } from 'fp-ts/function'
*
* assert.strictEqual(
* pipe(
* some(1),
* exists(n => n > 0)
* ),
* true
* )
* assert.strictEqual(
* pipe(
* some(1),
* exists(n => n > 1)
* ),
* false
* )
* assert.strictEqual(
* pipe(
* none,
* exists(n => n > 0)
* ),
* false
* )
*
* @since 2.0.0
*/
export declare const exists: <A>(predicate: Predicate<A>) => (ma: Option<A>) => boolean
/**
* @category do notation
* @since 2.9.0
*/
export declare const Do: Option<{}>
/**
* @category do notation
* @since 2.8.0
*/
export declare const bindTo: <N extends string>(name: N) => <A>(fa: Option<A>) => Option<{ readonly [K in N]: A }>
declare const let_: <N extends string, A, B>(
name: Exclude<N, keyof A>,
f: (a: A) => B
) => (fa: Option<A>) => Option<{ readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>
export {
/**
* @category do notation
* @since 2.13.0
*/
let_ as let
}
/**
* @category do notation
* @since 2.8.0
*/
export declare const bind: <N extends string, A, B>(
name: Exclude<N, keyof A>,
f: (a: A) => Option<B>
) => (ma: Option<A>) => Option<{ readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>
/**
* @category do notation
* @since 2.8.0
*/
export declare const apS: <N extends string, A, B>(
name: Exclude<N, keyof A>,
fb: Option<B>
) => (fa: Option<A>) => Option<{ readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>
/**
* @since 2.11.0
*/
export declare const ApT: Option<readonly []>
/**
* Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
export declare const traverseReadonlyNonEmptyArrayWithIndex: <A, B>(
f: (index: number, a: A) => Option<B>
) => (as: ReadonlyNonEmptyArray<A>) => Option<ReadonlyNonEmptyArray<B>>
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.11.0
*/
export declare const traverseReadonlyArrayWithIndex: <A, B>(
f: (index: number, a: A) => Option<B>
) => (as: readonly A[]) => Option<readonly B[]>
/**
* Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export declare const traverseArrayWithIndex: <A, B>(
f: (index: number, a: A) => Option<B>
) => (as: ReadonlyArray<A>) => Option<ReadonlyArray<B>>
/**
* Equivalent to `ReadonlyArray#traverse(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export declare const traverseArray: <A, B>(f: (a: A) => Option<B>) => (as: readonly A[]) => Option<readonly B[]>
/**
* Equivalent to `ReadonlyArray#sequence(Applicative)`.
*
* @category traversing
* @since 2.9.0
*/
export declare const sequenceArray: <A>(arr: ReadonlyArray<Option<A>>) => Option<ReadonlyArray<A>>
/**
* Use `Refinement` module instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare function getRefinement<A, B extends A>(getOption: (a: A) => Option<B>): Refinement<A, B>
/**
* Use [`chainNullableK`](#chainnullablek) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const mapNullable: <A, B>(f: (a: A) => B | null | undefined) => (ma: Option<A>) => Option<NonNullable<B>>
/**
* This instance is deprecated, use small, specific instances instead.
* For example if a function needs a `Functor` instance, pass `O.Functor` instead of `O.option`
* (where `O` is from `import O from 'fp-ts/Option'`)
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const option: Monad1<URI> &
Foldable1<URI> &
Alternative1<URI> &
Extend1<URI> &
Witherable1<URI> &
MonadThrow1<URI>
/**
* Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const getApplySemigroup: <A>(S: Semigroup<A>) => Semigroup<Option<A>>
/**
* Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const getApplyMonoid: <A>(M: Monoid<A>) => Monoid<Option<A>>
/**
* Use
*
* ```ts
* import { first } from 'fp-ts/Semigroup'
* import { getMonoid } from 'fp-ts/Option'
*
* getMonoid(first())
* ```
*
* instead.
*
* Monoid returning the left-most non-`None` value
*
* | x | y | concat(x, y) |
* | ------- | ------- | ------------ |
* | none | none | none |
* | some(a) | none | some(a) |
* | none | some(b) | some(b) |
* | some(a) | some(b) | some(a) |
*
* @example
* import { getFirstMonoid, some, none } from 'fp-ts/Option'
*
* const M = getFirstMonoid<number>()
* assert.deepStrictEqual(M.concat(none, none), none)
* assert.deepStrictEqual(M.concat(some(1), none), some(1))
* assert.deepStrictEqual(M.concat(none, some(2)), some(2))
* assert.deepStrictEqual(M.concat(some(1), some(2)), some(1))
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const getFirstMonoid: <A = never>() => Monoid<Option<A>>
/**
* Use
*
* ```ts
* import { last } from 'fp-ts/Semigroup'
* import { getMonoid } from 'fp-ts/Option'
*
* getMonoid(last())
* ```
*
* instead.
*
* Monoid returning the right-most non-`None` value
*
* | x | y | concat(x, y) |
* | ------- | ------- | ------------ |
* | none | none | none |
* | some(a) | none | some(a) |
* | none | some(b) | some(b) |
* | some(a) | some(b) | some(b) |
*
* @example
* import { getLastMonoid, some, none } from 'fp-ts/Option'
*
* const M = getLastMonoid<number>()
* assert.deepStrictEqual(M.concat(none, none), none)
* assert.deepStrictEqual(M.concat(some(1), none), some(1))
* assert.deepStrictEqual(M.concat(none, some(2)), some(2))
* assert.deepStrictEqual(M.concat(some(1), some(2)), some(2))
*
* @category zone of death
* @since 2.0.0
* @deprecated
*/
export declare const getLastMonoid: <A = never>() => Monoid<Option<A>>