<OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(
f: (
upstream: Pull.Pull<InElem, InErr, InDone>,
scope: Scope.Scope,
forkedScope: Scope.Scope
) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>
): Channel<
OutElem,
Pull.ExcludeDone<OutErr> | EX,
OutDone,
InElem,
InErr,
InDone,
Env | EnvX
>Creates a Channel from a transformation function that operates on upstream
pulls, but also provides a forked scope that closes when the resulting
Channel completes.
When to use
Use when building channels that require scoped resource lifecycle management, providing both the channel scope and a forked scope that automatically closes when the channel completes.
constructorsfromTransform
Source effect/Channel.ts:38819 lines
export const const fromTransformBracket: <
OutElem,
OutErr,
OutDone,
InElem,
InErr,
InDone,
EX,
EnvX,
Env
>(
f: (
upstream: Pull.Pull<InElem, InErr, InDone>,
scope: Scope.Scope,
forkedScope: Scope.Scope
) => Effect.Effect<
Pull.Pull<OutElem, OutErr, OutDone, EnvX>,
EX,
Env
>
) => Channel<
OutElem,
Pull.ExcludeDone<OutErr> | EX,
OutDone,
InElem,
InErr,
InDone,
Env | EnvX
>
Creates a Channel from a transformation function that operates on upstream
pulls, but also provides a forked scope that closes when the resulting
Channel completes.
When to use
Use when building channels that require scoped resource lifecycle management,
providing both the channel scope and a forked scope that automatically closes
when the channel completes.
fromTransformBracket = <function (type parameter) OutElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutElem, function (type parameter) OutErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutErr, function (type parameter) OutDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutDone, function (type parameter) InElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InElem, function (type parameter) InErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InErr, function (type parameter) InDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InDone, function (type parameter) EX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EX, function (type parameter) EnvX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EnvX, function (type parameter) Env in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>Env>(
f: (
upstream: Pull.Pull<InElem, InErr, InDone>,
scope: Scope.Scope,
forkedScope: Scope.Scope
) => Effect.Effect<
Pull.Pull<OutElem, OutErr, OutDone, EnvX>,
EX,
Env
>
upstream: Pull.Pull<InElem, InErr, InDone>(parameter) upstream: {
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;
}
import PullPull.interface Pull<out A, out E = never, out Done = void, out R = never>An effectful pull step that either produces a value, fails with E, or
signals completion with Cause.Done<Done>.
When to use
Use to model one low-level pull step when a consumer repeatedly evaluates an
effect that may emit a value, fail normally, or signal normal completion
through Cause.Done.
Details
Pull represents completion in the error channel so low-level stream
consumers can distinguish ordinary failures from end-of-input and carry a
leftover value when needed.
Pull<function (type parameter) InElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InElem, function (type parameter) InErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InErr, function (type parameter) InDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InDone>,
scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.Scope,
forkedScope: Scope.Scope(parameter) forkedScope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.Scope
) => 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<import PullPull.interface Pull<out A, out E = never, out Done = void, out R = never>An effectful pull step that either produces a value, fails with E, or
signals completion with Cause.Done<Done>.
When to use
Use to model one low-level pull step when a consumer repeatedly evaluates an
effect that may emit a value, fail normally, or signal normal completion
through Cause.Done.
Details
Pull represents completion in the error channel so low-level stream
consumers can distinguish ordinary failures from end-of-input and carry a
leftover value when needed.
Pull<function (type parameter) OutElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutElem, function (type parameter) OutErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutErr, function (type parameter) OutDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutDone, function (type parameter) EnvX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EnvX>, function (type parameter) EX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EX, function (type parameter) Env in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>Env>
): interface Channel<out OutElem, out OutErr = never, out OutDone = void, in InElem = unknown, in InErr = unknown, in InDone = unknown, out Env = never>A Channel is a nexus of I/O operations, which supports both reading and
writing. A channel may read values of type InElem and write values of type
OutElem. When the channel finishes, it yields a value of type OutDone. A
channel may fail with a value of type OutErr.
Details
Channels are the foundation of Streams: both streams and sinks are built on
channels. Most users shouldn't have to use channels directly, as streams and
sinks are much more convenient and cover all common use cases. However, when
adding new stream and sink operators, or doing something highly specialized,
it may be useful to use channels directly.
Channels compose in a variety of ways:
- Piping: One channel can be piped to another channel, assuming the
input type of the second is the same as the output type of the first.
- Sequencing: The terminal value of one channel can be used to create
another channel, and both the first channel and the function that makes
the second channel can be composed into a channel.
- Concatenating: The output of one channel can be used to create other
channels, which are all concatenated together. The first channel and the
function that makes the other channels can be composed into a channel.
Example (Typing channels)
import type { Channel } from "effect"
// A channel that outputs numbers and requires no environment
type NumberChannel = Channel.Channel<number>
// A channel that outputs strings, can fail with Error, completes with boolean
type StringChannel = Channel.Channel<string, Error, boolean>
// A channel with all type parameters specified
type FullChannel = Channel.Channel<
string, // OutElem - output elements
Error, // OutErr - output errors
number, // OutDone - completion value
number, // InElem - input elements
string, // InErr - input errors
boolean, // InDone - input completion
{ db: string } // Env - required environment
>
Channel<function (type parameter) OutElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutElem, import PullPull.type ExcludeDone<E> =
E extends Cause.Done<any> ? never : E
Excludes Cause.Done completion signals from an error type union.
When to use
Use to describe the ordinary error type that remains after Cause.Done
completion signals have been handled or filtered out of an error union.
ExcludeDone<function (type parameter) OutErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutErr> | function (type parameter) EX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EX, function (type parameter) OutDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutDone, function (type parameter) InElem in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InElem, function (type parameter) InErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InErr, function (type parameter) InDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>InDone, function (type parameter) Env in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>Env | function (type parameter) EnvX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EnvX> =>
const fromTransform: <
OutElem,
OutErr,
OutDone,
InElem,
InErr,
InDone,
EX,
EnvX,
Env
>(
transform: (
upstream: Pull.Pull<InElem, InErr, InDone>,
scope: Scope.Scope
) => Effect.Effect<
Pull.Pull<OutElem, OutErr, OutDone, EnvX>,
EX,
Env
>
) => Channel<
OutElem,
Pull.ExcludeDone<OutErr> | EX,
OutDone,
InElem,
InErr,
InDone,
Env | EnvX
>
Creates a Channel from a transformation function that operates on upstream pulls.
Example (Creating channels from transforms)
import { Channel, Effect } from "effect"
const channel = Channel.fromTransform((upstream, scope) =>
Effect.succeed(upstream)
)
fromTransform(
import EffectEffect.const fnUntraced: <Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>, Effect.Effect<OutElem, any, EnvX>, [upstream: Pull.Pull<InElem, InErr, InDone, never>, scope: Scope.Scope]>(body: (this: Types.unassigned, upstream: Pull.Pull<InElem, InErr, InDone, never>, scope: Scope.Scope) => Generator<Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>, Effect.Effect<...>, never>) => (upstream: Pull.Pull<...>, scope: Scope.Scope) => Effect.Effect<...> (+41 overloads)fnUntraced(function*(upstream: Pull.Pull<InElem, InErr, InDone, never>(parameter) upstream: {
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;
}
const closableScope: Scope.Closeableconst closableScope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.const forkUnsafe: (
scope: Scope,
finalizerStrategy?: "sequential" | "parallel"
) => Closeable
Creates a closeable child scope synchronously and registers it with a parent scope.
When to use
Use when a child scope must be created synchronously and the caller controls
both parent and child scope lifetimes.
Details
Closing the parent closes the child with the same exit value, and closing the
child detaches it from the parent. The optional finalizer strategy configures
the child scope and defaults to "sequential" when omitted.
Example (Creating a child scope synchronously)
import { Console, Effect, Exit, Scope } from "effect"
const program = Effect.gen(function*() {
const parentScope = Scope.makeUnsafe("sequential")
const childScope = Scope.forkUnsafe(parentScope, "parallel")
// Add finalizers to both scopes
yield* Scope.addFinalizer(parentScope, Console.log("Parent cleanup"))
yield* Scope.addFinalizer(childScope, Console.log("Child cleanup"))
// Close child first, then parent
yield* Scope.close(childScope, Exit.void)
yield* Scope.close(parentScope, Exit.void)
})
forkUnsafe(scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
const onCause: (
cause: Cause.Cause<
EX | OutErr | Cause.Done<OutDone>
>
) => Effect.Effect<void, never, never>
cause: Cause.Cause<
EX | OutErr | Cause.Done<OutDone>
>
(parameter) cause: {
reasons: ReadonlyArray<Reason<E>>;
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;
}
import CauseCause.type Cause.Cause = /*unresolved*/ anyCause<function (type parameter) EX in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>EX | function (type parameter) OutErr in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutErr | import CauseCause.type Cause.Done = /*unresolved*/ anyDone<function (type parameter) OutDone in <OutElem, OutErr, OutDone, InElem, InErr, InDone, EX, EnvX, Env>(f: (upstream: Pull.Pull<InElem, InErr, InDone>, scope: Scope.Scope, forkedScope: Scope.Scope) => Effect.Effect<Pull.Pull<OutElem, OutErr, OutDone, EnvX>, EX, Env>): Channel<OutElem, Pull.ExcludeDone<OutErr> | EX, OutDone, InElem, InErr, InDone, Env | EnvX>OutDone>>) =>
import ScopeScope.const close: <A, E>(
self: Scope,
exit: Exit<A, E>
) => Effect<void>
Closes a scope and runs its registered finalizers.
When to use
Use to close a scope manually with a specific exit value.
Details
Finalizers run in the scope's configured order and receive the supplied
Exit.
Example (Running scope finalizers)
import { Console, Effect, Exit, Scope } from "effect"
const resourceManagement = Effect.gen(function*() {
const scope = yield* Scope.make("sequential")
// Add multiple finalizers
yield* Scope.addFinalizer(scope, Console.log("Close database connection"))
yield* Scope.addFinalizer(scope, Console.log("Close file handle"))
yield* Scope.addFinalizer(scope, Console.log("Release memory"))
// Do some work...
yield* Console.log("Performing operations...")
// Close scope - finalizers run in reverse order of registration
yield* Scope.close(scope, Exit.succeed("Success!"))
// Output: "Release memory", "Close file handle", "Close database connection"
})
close(const closableScope: Scope.Closeableconst closableScope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import PullPull.const doneExitFromCause: <E>(
cause: Cause.Cause<E>
) => Exit.Exit<
Cause.Done.Extract<E>,
ExcludeDone<E>
>
Converts a Cause into an Exit, treating Cause.Done as successful
completion.
When to use
Use to produce an Exit for finalizing a low-level pull workflow when a
Cause.Done signal should be treated as success and any remaining cause
should fail.
Details
If the cause contains a done value, that leftover becomes the successful
value. Otherwise the non-done cause becomes the failure cause.
doneExitFromCause(cause: Cause.Cause<
EX | OutErr | Cause.Done<OutDone>
>
(parameter) cause: {
reasons: ReadonlyArray<Reason<E>>;
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;
}
const pull: Pull.Pull<
OutElem,
OutErr,
OutDone,
EnvX
>
const 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;
}
import EffectEffect.const onError: {
<E, X, R2>(
cleanup: (
cause: Cause.Cause<E>
) => Effect<X, never, R2>
): <A, R>(
self: Effect<A, E, R>
) => Effect<A, E, R2 | R>
<A, E, R, X, R2>(
self: Effect<A, E, R>,
cleanup: (
cause: Cause.Cause<E>
) => Effect<X, never, R2>
): Effect<A, E, R2 | R>
}
f: (
upstream: Pull.Pull<InElem, InErr, InDone>,
scope: Scope.Scope,
forkedScope: Scope.Scope
) => Effect.Effect<
Pull.Pull<OutElem, OutErr, OutDone, EnvX>,
EX,
Env
>
upstream: Pull.Pull<InElem, InErr, InDone, never>(parameter) upstream: {
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;
}
const closableScope: Scope.Closeableconst closableScope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
const onCause: (
cause: Cause.Cause<
EX | OutErr | Cause.Done<OutDone>
>
) => Effect.Effect<void, never, never>
import EffectEffect.const onError: {
<E, X, R2>(
cleanup: (
cause: Cause.Cause<E>
) => Effect<X, never, R2>
): <A, R>(
self: Effect<A, E, R>
) => Effect<A, E, R2 | R>
<A, E, R, X, R2>(
self: Effect<A, E, R>,
cleanup: (
cause: Cause.Cause<E>
) => Effect<X, never, R2>
): Effect<A, E, R2 | R>
}
const pull: Pull.Pull<
OutElem,
OutErr,
OutDone,
EnvX
>
const 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;
}
const onCause: (
cause: Cause.Cause<
EX | OutErr | Cause.Done<OutDone>
>
) => Effect.Effect<void, never, never>
Referenced by 10 symbols