<A, E2, R2>(
predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>,
options?: { readonly excludeLast?: boolean | undefined }
): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
<A, E, R, E2, R2>(
self: Stream<A, E, R>,
predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>,
options?: { readonly excludeLast?: boolean | undefined }
): Stream<A, E | E2, R | R2>Takes stream elements until an effectful predicate returns true.
When to use
Use when the stopping condition needs an Effect or service and predicate failure should fail the stream.
Example (Taking until an effectful predicate matches)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
const result = yield* Stream.range(1, 5).pipe(
Stream.takeUntilEffect((n) => Effect.succeed(n % 3 === 0)),
Stream.runCollect
)
yield* Console.log(result)
})
Effect.runPromise(program)
// Output: [ 1, 2, 3 ]filtering
Source effect/Stream.ts:647338 lines
export const const takeUntilEffect: {
<A, E2, R2>(
predicate: (
a: NoInfer<A>,
n: number
) => Effect.Effect<boolean, E2, R2>,
options?: {
readonly excludeLast?: boolean | undefined
}
): <E, R>(
self: Stream<A, E, R>
) => Stream<A, E2 | E, R2 | R>
<A, E, R, E2, R2>(
self: Stream<A, E, R>,
predicate: (
a: A,
n: number
) => Effect.Effect<boolean, E2, R2>,
options?: {
readonly excludeLast?: boolean | undefined
}
): Stream<A, E | E2, R | R2>
}
Takes stream elements until an effectful predicate returns true.
When to use
Use when the stopping condition needs an Effect or service and predicate
failure should fail the stream.
Example (Taking until an effectful predicate matches)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
const result = yield* Stream.range(1, 5).pipe(
Stream.takeUntilEffect((n) => Effect.succeed(n % 3 === 0)),
Stream.runCollect
)
yield* Console.log(result)
})
Effect.runPromise(program)
// Output: [ 1, 2, 3 ]
takeUntilEffect: {
<function (type parameter) A in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) E2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) R2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
predicate: (
a: NoInfer<A>,
n: number
) => Effect.Effect<boolean, E2, R2>
a: NoInfer<A>a: type NoInfer<A> = [A][A extends any ? 0 : never]Prevents TypeScript from inferring a type parameter from a specific
position.
When to use
Use when a function parameter must match an inferred type without becoming
an inference source.
Details
The parameter using NoInfer must still match the inferred type.
Example (Controlling inference)
import type { Types } from "effect"
declare function withDefault<T>(value: T, fallback: Types.NoInfer<T>): T
// T is inferred as "a" | "b" from the first argument only
const result = withDefault<"a" | "b">("a", "b")
NoInfer<function (type parameter) A in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
n: numbern: number) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<boolean, function (type parameter) E2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) R2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
options: | {
readonly excludeLast?: boolean | undefined
}
| undefined
excludeLast?: boolean | undefinedexcludeLast?: boolean | undefined
}
): <function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>E, function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>R>(self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>E, function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>R>) => interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) E2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) E in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>E, function (type parameter) R2 in <A, E2, R2>(predicate: (a: NoInfer<A>, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): <E, R>(self: Stream<A, E, R>) => Stream<A, E2 | E, R2 | R>
function (type parameter) R in <E, R>(self: Stream<A, E, R>): Stream<A, E2 | E, R2 | R>R>
<function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
predicate: (
a: A,
n: number
) => Effect.Effect<boolean, E2, R2>
a: Aa: function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
n: numbern: number) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<boolean, function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
options: | {
readonly excludeLast?: boolean | undefined
}
| undefined
excludeLast?: boolean | undefinedexcludeLast?: boolean | undefined
}
): interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
dual<(...args: Array<any>) => any, <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}) => Stream<A, E | E2, R | R2>>(isDataFirst: (args: IArguments) => boolean, body: <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}) => Stream<A, E | E2, R | R2>): ((...args: Array<any>) => any) & (<A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}) => Stream<A, E | E2, R | R2>) (+1 overload)
Creates a function that can be called in data-first style or data-last
(pipe-friendly) style.
When to use
Use to expose one implementation through both direct and pipe-friendly
call styles.
Details
Pass either the arity of the uncurried function or a predicate that decides
whether the current call is data-first. Arity is the common case. Use a
predicate when optional arguments make arity ambiguous.
Example (Selecting data-first or data-last style by arity)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(2, (self, that) => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Defining overloads with call signatures)
import { Function, pipe } from "effect"
const sum: {
(that: number): (self: number) => number
(self: number, that: number): number
} = Function.dual(2, (self: number, that: number): number => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Selecting data-first or data-last style with a predicate)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(
(args) => args.length === 2,
(self, that) => self + that
)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
dual((args: IArgumentsargs) => const isStream: (
u: unknown
) => u is Stream<unknown, unknown, unknown>
Checks whether a value is a Stream.
Example (Checking whether a value is a Stream)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
const stream = Stream.make(1, 2, 3)
const notStream = { data: [1, 2, 3] }
yield* Console.log(Stream.isStream(stream))
// true
yield* Console.log(Stream.isStream(notStream))
// false
})
Effect.runPromise(program)
isStream(args: IArgumentsargs[0]), <function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
predicate: (
a: A,
n: number
) => Effect.Effect<boolean, E2, R2>
a: Aa: function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
n: numbern: number) => import EffectEffect.interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<boolean, function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
options: | {
readonly excludeLast?: boolean | undefined
}
| undefined
excludeLast?: boolean | undefinedexcludeLast?: boolean | undefined
}
): interface Stream<out A, out E = never, out R = never>A Stream<A, E, R> describes a program that can emit many A values, fail
with E, and require R.
Details
Streams are pull-based with backpressure and emit chunks to amortize effect
evaluation. They support monadic composition and error handling similar to
Effect, adapted for multiple values.
Example (Creating and consuming streams)
import { Console, Effect, Stream } from "effect"
const program = Effect.gen(function*() {
yield* Stream.make(1, 2, 3).pipe(
Stream.map((n) => n * 2),
Stream.runForEach((n) => Console.log(n))
)
})
Effect.runPromise(program)
// Output:
// 2
// 4
// 6
Stream<function (type parameter) A in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) E2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
function (type parameter) R2 in <A, E, R, E2, R2>(self: Stream<A, E, R>, predicate: (a: A, n: number) => Effect.Effect<boolean, E2, R2>, options?: {
readonly excludeLast?: boolean | undefined;
}): Stream<A, E | E2, R | R2>
const transformPull: <
A,
E,
R,
B,
E2,
R2,
EX,
RX
>(
self: Stream<A, E, R>,
f: (
pull: Pull.Pull<
Arr.NonEmptyReadonlyArray<A>,
E,
void
>,
scope: Scope.Scope
) => Effect.Effect<
Pull.Pull<
Arr.NonEmptyReadonlyArray<B>,
E2,
void,
R2
>,
EX,
RX
>
) => Stream<
B,
EX | Pull.ExcludeDone<E2>,
R | R2 | RX
>
Derives a stream by transforming its pull effect.
Example (Transforming a pull effect)
import { Console, Effect, Stream } from "effect"
const stream = Stream.make(1, 2, 3)
const transformed = Stream.transformPull(stream, (pull) => Effect.succeed(pull))
const program = Effect.gen(function*() {
const values = yield* Stream.runCollect(transformed)
yield* Console.log(values)
})
Effect.runPromise(program)
// Output: [ 1, 2, 3 ]
transformPull(self: Stream<A, E, R>(parameter) self: {
channel: Channel.Channel<Arr.NonEmptyReadonlyArray<A>, E, void, unknown, unknown, unknown, R>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
pull: Pull.Pull<
readonly [A, ...A[]],
E,
void,
never
>
(parameter) pull: {
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
_scope: Scope.Scope(parameter) _scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import EffectEffect.const sync: <A>(
thunk: LazyArg<A>
) => Effect<A>
Creates an Effect that represents a synchronous side-effectful computation.
When to use
Use when you need to wrap a synchronous side-effectful operation that is not
expected to throw.
Details
The provided function is evaluated lazily when the effect runs.
Gotchas
The function must not throw. If it throws, the thrown value is treated as a
defect, not as a typed failure. Use try when throwing is expected.
Example (Capturing synchronous logging in an Effect)
import { Effect } from "effect"
const log = (message: string) =>
Effect.sync(() => {
console.log(message) // side effect
})
// ┌─── Effect<void, never, never>
// ▼
const program = log("Hello, World!")
sync(() => {
let let i: numberi = 0
let let done: booleandone = false
return import EffectEffect.const gen: {
<Eff extends Effect<any, any, any>, AEff>(
f: () => Generator<Eff, AEff, never>
): Effect<
AEff,
[Eff] extends [never]
? never
: [Eff] extends [
Effect<infer _A, infer E, infer _R>
]
? E
: never,
[Eff] extends [never]
? never
: [Eff] extends [
Effect<infer _A, infer _E, infer R>
]
? R
: never
>
<Self, Eff extends Effect<any, any, any>, AEff>(
options: { readonly self: Self },
f: (this: Self) => Generator<Eff, AEff, never>
): Effect<
AEff,
[Eff] extends [never]
? never
: [Eff] extends [
Effect<infer _A, infer E, infer _R>
]
? E
: never,
[Eff] extends [never]
? never
: [Eff] extends [
Effect<infer _A, infer _E, infer R>
]
? R
: never
>
}
let done: booleandone) return yield* import CauseCause.const done: <A = void>(
value?: A
) => Effect.Effect<never, Done<A>>
Creates an Effect that fails with a Done error. Shorthand for
Effect.fail(Cause.Done(value)).
When to use
Use when you model stream or queue completion through the error channel.
Example (Failing with Done)
import { Cause, Effect } from "effect"
const program = Cause.done("finished")
Effect.runPromiseExit(program).then((exit) => {
console.log(exit._tag) // "Failure"
})
done()
const const chunk: readonly [A, ...A[]]const chunk: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
pull: Pull.Pull<
readonly [A, ...A[]],
E,
void,
never
>
(parameter) pull: {
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
let j: numberj = 0; let j: numberj < const chunk: readonly [A, ...A[]]const chunk: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
length: numberlength; let j: numberj++) {
if (yield* predicate: (
a: A,
n: number
) => Effect.Effect<boolean, E2, R2>
const chunk: readonly [A, ...A[]]const chunk: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
let j: numberj], let i: numberi++)) {
let done: booleandone = true
const const arr: A[]arr = const chunk: readonly [A, ...A[]]const chunk: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
ReadonlyArray<A>.slice(start?: number, end?: number): A[]Returns a section of an array.
slice(0, options: | {
readonly excludeLast?: boolean | undefined
}
| undefined
excludeLast?: boolean | undefinedexcludeLast ? let j: numberj : let j: numberj + 1)
return import ArrArr.const isReadonlyArrayNonEmpty: <A>(
self: ReadonlyArray<A>
) => self is NonEmptyReadonlyArray<A>
Checks whether a ReadonlyArray is non-empty, narrowing the type to
NonEmptyReadonlyArray.
When to use
Use when you need to prove a readonly array has at least one element without
requiring mutable array methods afterward.
Example (Checking for a non-empty readonly array)
import { Array } from "effect"
console.log(Array.isReadonlyArrayNonEmpty([])) // false
console.log(Array.isReadonlyArrayNonEmpty([1, 2, 3])) // true
isReadonlyArrayNonEmpty(const arr: A[]arr) ? const arr: A[] & readonly [A, ...A[]]arr : yield* import CauseCause.const done: <A = void>(
value?: A
) => Effect.Effect<never, Done<A>>
Creates an Effect that fails with a Done error. Shorthand for
Effect.fail(Cause.Done(value)).
When to use
Use when you model stream or queue completion through the error channel.
Example (Failing with Done)
import { Cause, Effect } from "effect"
const program = Cause.done("finished")
Effect.runPromiseExit(program).then((exit) => {
console.log(exit._tag) // "Failure"
})
done()
}
}
return const chunk: readonly [A, ...A[]]const chunk: {
0: A;
length: number;
toString: () => string;
toLocaleString: { (): string; (locales: string | string[], options?: Intl.NumberFormatOptions & Intl.DateTimeFormatOptions): string };
concat: { (...items: Array<ConcatArray<A>>): Array<A>; (...items: Array<A | ConcatArray<A>>): Array<A> };
join: (separator?: string) => string;
slice: (start?: number, end?: number) => Array<A>;
indexOf: (searchElement: A, fromIndex?: number) => number;
lastIndexOf: (searchElement: A, fromIndex?: number) => number;
every: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): this is readonly S[]; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): boolean };
some: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => boolean;
forEach: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => void, thisArg?: any) => void;
map: (callbackfn: (value: A, index: number, array: ReadonlyArray<A>) => U, thisArg?: any) => Array<U>;
filter: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): Array<S>; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): Array<A> };
reduce: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
reduceRight: { (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A): A; (callbackfn: (previousValue: A, currentValue: A, currentIndex: number, array: ReadonlyArray<A>) => A, initialValue: A): A; (callbac…;
find: { (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findIndex: (predicate: (value: A, index: number, obj: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
entries: () => ArrayIterator<[number, A]>;
keys: () => ArrayIterator<number>;
values: () => ArrayIterator<A>;
includes: (searchElement: A, fromIndex?: number) => boolean;
flatMap: (callback: (this: This, value: A, index: number, array: Array<A>) => U | ReadonlyArray<U>, thisArg?: This | undefined) => Array<U>;
flat: (this: A, depth?: D | undefined) => Array<FlatArray<A, D>>;
at: (index: number) => A | undefined;
findLast: { (predicate: (value: A, index: number, array: ReadonlyArray<A>) => value is S, thisArg?: any): S | undefined; (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any): A | undefined };
findLastIndex: (predicate: (value: A, index: number, array: ReadonlyArray<A>) => unknown, thisArg?: any) => number;
toReversed: () => Array<A>;
toSorted: (compareFn?: ((a: A, b: A) => number) | undefined) => Array<A>;
toSpliced: { (start: number, deleteCount: number, ...items: Array<A>): Array<A>; (start: number, deleteCount?: number): Array<A> };
with: (index: number, value: A) => Array<A>;
}
Referenced by 1 symbols