<Key, A>(key: Key): <E, R>(
self: ScopedCache<Key, A, E, R>
) => Effect.Effect<A, E, R>
<Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<
A,
E,
R
>Gets the value for a key, running the cache lookup when no unexpired entry is present.
When to use
Use to retrieve a scoped cached value by key when a missing or expired entry should run the cache lookup and share the in-flight lookup with concurrent callers.
Details
Concurrent get calls for the same key share the same in-flight lookup.
Successful and failed lookup exits are cached according to the configured
TTL. If the cache is closed, the effect is interrupted.
Source effect/ScopedCache.ts:25442 lines
export const const get: {
<Key, A>(key: Key): <E, R>(
self: ScopedCache<Key, A, E, R>
) => Effect.Effect<A, E, R>
<Key, A, E, R>(
self: ScopedCache<Key, A, E, R>,
key: Key
): Effect.Effect<A, E, R>
}
Gets the value for a key, running the cache lookup when no unexpired entry is
present.
When to use
Use to retrieve a scoped cached value by key when a missing or expired entry
should run the cache lookup and share the in-flight lookup with concurrent
callers.
Details
Concurrent get calls for the same key share the same in-flight lookup.
Successful and failed lookup exits are cached according to the configured
TTL. If the cache is closed, the effect is interrupted.
get: {
<function (type parameter) Key in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>A>(key: Keykey: function (type parameter) Key in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>Key): <function (type parameter) E in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>E, function (type parameter) R in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>R>(self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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 ScopedCache<in out Key, in out A, in out E = never, out R = never>A scoped cache whose values are acquired by a lookup effect and stored in
per-entry scopes.
When to use
Use to cache values that acquire scoped resources and must release those
resources when entries expire, are evicted, or are invalidated.
Details
Concurrent requests for the same key share the same in-flight lookup.
Entries can expire based on the lookup exit, are evicted when capacity is
exceeded, and release their entry scopes when invalidated, evicted, expired,
or when the cache's owning scope closes.
ScopedCache<function (type parameter) Key in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>A, function (type parameter) E in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>E, function (type parameter) R in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>R>) => 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<function (type parameter) A in <Key, A>(key: Key): <E, R>(self: ScopedCache<Key, A, E, R>) => Effect.Effect<A, E, R>A, function (type parameter) E in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>E, function (type parameter) R in <E, R>(self: ScopedCache<Key, A, E, R>): Effect.Effect<A, E, R>R>
<function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R>(self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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 ScopedCache<in out Key, in out A, in out E = never, out R = never>A scoped cache whose values are acquired by a lookup effect and stored in
per-entry scopes.
When to use
Use to cache values that acquire scoped resources and must release those
resources when entries expire, are evicted, or are invalidated.
Details
Concurrent requests for the same key share the same in-flight lookup.
Entries can expire based on the lookup exit, are evicted when capacity is
exceeded, and release their entry scopes when invalidated, evicted, expired,
or when the cache's owning scope closes.
ScopedCache<function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R>, key: Keykey: function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key): 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<function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R>
} = dual<(...args: Array<any>) => any, <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key) => Effect.Effect<A, E, R>>(arity: 2, body: <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key) => Effect.Effect<A, E, R>): ((...args: Array<any>) => any) & (<Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key) => Effect.Effect<A, E, R>) (+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(
2,
<function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R>(self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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 ScopedCache<in out Key, in out A, in out E = never, out R = never>A scoped cache whose values are acquired by a lookup effect and stored in
per-entry scopes.
When to use
Use to cache values that acquire scoped resources and must release those
resources when entries expire, are evicted, or are invalidated.
Details
Concurrent requests for the same key share the same in-flight lookup.
Entries can expire based on the lookup exit, are evicted when capacity is
exceeded, and release their entry scopes when invalidated, evicted, expired,
or when the cache's owning scope closes.
ScopedCache<function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key, function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R>, key: Keykey: function (type parameter) Key in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>Key): 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<function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E, function (type parameter) R in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>R> =>
import effecteffect.const uninterruptibleMask: <A, E, R>(
f: (
restore: <A, E, R>(
effect: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
restore: <A, E, R>(
effect: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
import corecore.const withFiber: <
A,
E = never,
R = never
>(
evaluate: (
fiber: FiberImpl<unknown, unknown>
) => Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
fiber: effect.FiberImpl<unknown, unknown>(parameter) fiber: {
id: number;
interruptible: boolean;
currentOpCount: number;
currentLoopCount: number;
_stack: Array<Primitive>;
_observers: Array<(exit: Exit.Exit<A, E>) => void>;
_exit: Exit.Exit<A, E> | undefined;
_currentExit: Exit.Exit<A, E> | undefined;
_children: Set<FiberImpl<any, any>> | undefined;
_interruptedCause: Cause.Cause<never> | undefined;
_yielded: Exit.Exit<any, any> | (() => void) | undefined;
context: Context.Context<never>;
currentScheduler: Scheduler.Scheduler;
currentTracerContext: Tracer.Tracer["context"];
currentSpan: Tracer.AnySpan | undefined;
currentLogLevel: LogLevel.LogLevel;
minimumLogLevel: LogLevel.LogLevel;
currentStackFrame: StackFrame | undefined;
runtimeMetrics: Metric.FiberRuntimeMetricsService | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
_dispatcher: Scheduler.SchedulerDispatcher | undefined;
currentDispatcher: SchedulerDispatcher;
getRef: <X>(ref: Context.Reference<X>) => X;
addObserver: (cb: (exit: Exit.Exit<unknown, unknown>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit.Exit<unknown, unknown> | undefined;
evaluate: (effect: core.Primitive) => void;
runLoop: (effect: core.Primitive) => typeof core.Yield | Exit.Exit<unknown, unknown>;
getCont: <S extends core.contA | core.contE>(symbol: S) => (core.Primitive & Record<S, (value: any, fiber: effect.FiberImpl) => core.Primitive>) | undefined;
yieldWith: (value: Exit.Exit<any, any> | (() => void)) => core.Yield;
children: () => Set<Fiber.Fiber<any, any>>;
pipe: () => unknown;
setContext: (context: Context.Context<never>) => void;
currentSpanLocal: Span | undefined;
}
const state: State<Key, A, E>state = self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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; <…;
}
ScopedCache<Key, A, E, R>.state: State<Key, A, E>state
if (const state: State<Key, A, E>state._tag: "Open" | "Closed"_tag === "Closed") {
return import effecteffect.const interrupt: Effect.Effect<never>const interrupt: {
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 oentry: Option.Option<Entry<A, E>>oentry = import MutableHashMapMutableHashMap.const get: {
<K>(key: K): <V>(
self: MutableHashMap<K, V>
) => Option.Option<V>
<K, V>(
self: MutableHashMap<K, V>,
key: K
): Option.Option<V>
}
const state: {
readonly _tag: "Open"
readonly map: MutableHashMap.MutableHashMap<
Key,
Entry<A, E>
>
}
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>
(property) map: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
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;
}
key: Keykey)
if (import OptionOption.const isSome: <A>(
self: Option<A>
) => self is Some<A>
Checks whether an Option contains a value (Some).
When to use
Use when you need to branch on a present Option before accessing .value.
Details
- Acts as a type guard, narrowing to
Some<A>
Example (Checking for Some)
import { Option } from "effect"
console.log(Option.isSome(Option.some(1)))
// Output: true
console.log(Option.isSome(Option.none()))
// Output: false
isSome(const oentry: Option.Option<Entry<A, E>>oentry) && !const hasExpired: <A, E>(
entry: Entry<A, E>,
fiber: Fiber.Fiber<unknown, unknown>
) => boolean
const oentry: Option.Some<Entry<A, E>>const oentry: {
_tag: "Some";
_op: "Some";
value: A;
valueOrUndefined: A;
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;
}
Some<Entry<A, E>>.value: Entry<A, E>(property) Some<Entry<A, E>>.value: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
fiber: effect.FiberImpl<unknown, unknown>(parameter) fiber: {
id: number;
interruptible: boolean;
currentOpCount: number;
currentLoopCount: number;
_stack: Array<Primitive>;
_observers: Array<(exit: Exit.Exit<A, E>) => void>;
_exit: Exit.Exit<A, E> | undefined;
_currentExit: Exit.Exit<A, E> | undefined;
_children: Set<FiberImpl<any, any>> | undefined;
_interruptedCause: Cause.Cause<never> | undefined;
_yielded: Exit.Exit<any, any> | (() => void) | undefined;
context: Context.Context<never>;
currentScheduler: Scheduler.Scheduler;
currentTracerContext: Tracer.Tracer["context"];
currentSpan: Tracer.AnySpan | undefined;
currentLogLevel: LogLevel.LogLevel;
minimumLogLevel: LogLevel.LogLevel;
currentStackFrame: StackFrame | undefined;
runtimeMetrics: Metric.FiberRuntimeMetricsService | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
_dispatcher: Scheduler.SchedulerDispatcher | undefined;
currentDispatcher: SchedulerDispatcher;
getRef: <X>(ref: Context.Reference<X>) => X;
addObserver: (cb: (exit: Exit.Exit<unknown, unknown>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit.Exit<unknown, unknown> | undefined;
evaluate: (effect: core.Primitive) => void;
runLoop: (effect: core.Primitive) => typeof core.Yield | Exit.Exit<unknown, unknown>;
getCont: <S extends core.contA | core.contE>(symbol: S) => (core.Primitive & Record<S, (value: any, fiber: effect.FiberImpl) => core.Primitive>) | undefined;
yieldWith: (value: Exit.Exit<any, any> | (() => void)) => core.Yield;
children: () => Set<Fiber.Fiber<any, any>>;
pipe: () => unknown;
setContext: (context: Context.Context<never>) => void;
currentSpanLocal: Span | undefined;
}
import MutableHashMapMutableHashMap.const remove: {
<K>(key: K): <V>(
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K
): MutableHashMap<K, V>
}
const state: {
readonly _tag: "Open"
readonly map: MutableHashMap.MutableHashMap<
Key,
Entry<A, E>
>
}
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>
(property) map: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
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;
}
key: Keykey)
import MutableHashMapMutableHashMap.const set: {
<K, V>(key: K, value: V): (
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K,
value: V
): MutableHashMap<K, V>
}
const state: {
readonly _tag: "Open"
readonly map: MutableHashMap.MutableHashMap<
Key,
Entry<A, E>
>
}
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>
(property) map: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
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;
}
key: Keykey, const oentry: Option.Some<Entry<A, E>>const oentry: {
_tag: "Some";
_op: "Some";
value: A;
valueOrUndefined: A;
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;
}
Some<Entry<A, E>>.value: Entry<A, E>(property) Some<Entry<A, E>>.value: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
restore: <A, E, R>(
effect: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
import DeferredDeferred.await<A, E>(self: Deferred<A, E>): Effect<A, E>Retrieves the value of the Deferred, suspending the fiber running the
workflow until the result is available.
When to use
Use to wait for a Deferred to be completed and resume with its success,
failure, defect, or interruption.
Details
Awaiters observe the completion effect stored in the Deferred.
Example (Awaiting a Deferred value)
import { Deferred, Effect } from "effect"
const program = Effect.gen(function*() {
const deferred = yield* Deferred.make<number>()
yield* Deferred.succeed(deferred, 42)
const value = yield* Deferred.await(deferred)
console.log(value) // 42
})
await(const oentry: Option.Some<Entry<A, E>>const oentry: {
_tag: "Some";
_op: "Some";
value: A;
valueOrUndefined: A;
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;
}
Some<Entry<A, E>>.value: Entry<A, E>(property) Some<Entry<A, E>>.value: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
Entry<A, E>.deferred: Deferred.Deferred<A, E>(property) Entry<A, E>.deferred: {
effect: Effect<A, E>;
resumes: Array<(effect: Effect<A, E>) => void> | undefined;
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; <…;
}
const scope: Scope.Closeableconst scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.const makeUnsafe: (
finalizerStrategy?: "sequential" | "parallel"
) => Closeable
Creates a new Scope synchronously without wrapping it in an Effect.
This is useful when you need a scope immediately but should be used with caution
as it doesn't provide the same safety guarantees as the Effect-wrapped version.
When to use
Use when a scope must be allocated synchronously and the caller will close it
manually.
Example (Creating a scope synchronously)
import { Console, Effect, Exit, Scope } from "effect"
// Create a scope immediately
const scope = Scope.makeUnsafe("sequential")
// Use it in an Effect program
const program = Effect.gen(function*() {
yield* Scope.addFinalizer(scope, Console.log("Cleanup"))
yield* Scope.close(scope, Exit.void)
})
makeUnsafe()
const const deferred: Deferred.Deferred<A, E>const deferred: {
effect: Effect<A, E>;
resumes: Array<(effect: Effect<A, E>) => void> | undefined;
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; <…;
}
import DeferredDeferred.const makeUnsafe: <
A,
E = never
>() => Deferred<A, E>
Creates an empty Deferred synchronously outside the Effect runtime.
When to use
Use to allocate a Deferred synchronously when direct allocation outside
Effect is required.
Example (Creating a Deferred unsafely)
import { Deferred } from "effect"
const deferred = Deferred.makeUnsafe<number>()
console.log(deferred)
makeUnsafe<function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E>()
const const entry: Entry<A, E>const entry: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
interface Entry<A, E>A single scoped cache entry.
When to use
Use when inspecting the open state of a ScopedCache and you need the stored
deferred result, entry scope, or expiration timestamp for a key.
Details
The entry contains the deferred lookup result shared by readers, the scope
that owns resources acquired while computing the value, and an optional
expiration time in milliseconds. Removing the entry closes its scope.
Entry<function (type parameter) A in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>A, function (type parameter) E in <Key, A, E, R>(self: ScopedCache<Key, A, E, R>, key: Key): Effect.Effect<A, E, R>E> = {
Entry<A, E>.expiresAt: number | undefinedexpiresAt: var undefinedundefined,
Entry<A, E>.deferred: Deferred.Deferred<A, E>(property) Entry<A, E>.deferred: {
effect: Effect<A, E>;
resumes: Array<(effect: Effect<A, E>) => void> | undefined;
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; <…;
}
Entry<A, E>.scope: Scope.Closeable(property) Entry<A, E>.scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import MutableHashMapMutableHashMap.const set: {
<K, V>(key: K, value: V): (
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K,
value: V
): MutableHashMap<K, V>
}
const state: {
readonly _tag: "Open"
readonly map: MutableHashMap.MutableHashMap<
Key,
Entry<A, E>
>
}
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>
(property) map: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
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;
}
key: Keykey, const entry: Entry<A, E>const entry: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
const checkCapacity: <K, A, E>(
parent: Fiber.Fiber<unknown, unknown>,
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>,
capacity: number
) => Effect.Effect<void>
fiber: effect.FiberImpl<unknown, unknown>(parameter) fiber: {
id: number;
interruptible: boolean;
currentOpCount: number;
currentLoopCount: number;
_stack: Array<Primitive>;
_observers: Array<(exit: Exit.Exit<A, E>) => void>;
_exit: Exit.Exit<A, E> | undefined;
_currentExit: Exit.Exit<A, E> | undefined;
_children: Set<FiberImpl<any, any>> | undefined;
_interruptedCause: Cause.Cause<never> | undefined;
_yielded: Exit.Exit<any, any> | (() => void) | undefined;
context: Context.Context<never>;
currentScheduler: Scheduler.Scheduler;
currentTracerContext: Tracer.Tracer["context"];
currentSpan: Tracer.AnySpan | undefined;
currentLogLevel: LogLevel.LogLevel;
minimumLogLevel: LogLevel.LogLevel;
currentStackFrame: StackFrame | undefined;
runtimeMetrics: Metric.FiberRuntimeMetricsService | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
_dispatcher: Scheduler.SchedulerDispatcher | undefined;
currentDispatcher: SchedulerDispatcher;
getRef: <X>(ref: Context.Reference<X>) => X;
addObserver: (cb: (exit: Exit.Exit<unknown, unknown>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit.Exit<unknown, unknown> | undefined;
evaluate: (effect: core.Primitive) => void;
runLoop: (effect: core.Primitive) => typeof core.Yield | Exit.Exit<unknown, unknown>;
getCont: <S extends core.contA | core.contE>(symbol: S) => (core.Primitive & Record<S, (value: any, fiber: effect.FiberImpl) => core.Primitive>) | undefined;
yieldWith: (value: Exit.Exit<any, any> | (() => void)) => core.Yield;
children: () => Set<Fiber.Fiber<any, any>>;
pipe: () => unknown;
setContext: (context: Context.Context<never>) => void;
currentSpanLocal: Span | undefined;
}
const state: {
readonly _tag: "Open"
readonly map: MutableHashMap.MutableHashMap<
Key,
Entry<A, E>
>
}
map: MutableHashMap.MutableHashMap<
K,
Entry<A, E>
>
(property) map: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
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;
}
self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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; <…;
}
ScopedCache<in out Key, in out A, in out E = never, out R = never>.capacity: numbercapacity).Pipeable.pipe<Effect.Effect<void, never, never>, Effect.Effect<void, never, never>, Effect.Effect<A, E, Exclude<R, Scope.Scope>>, Effect.Effect<A, E, Exclude<R, Scope.Scope>>>(this: Effect.Effect<...>, ab: (_: Effect.Effect<void, never, never>) => Effect.Effect<void, never, never>, bc: (_: Effect.Effect<void, never, never>) => Effect.Effect<A, E, Exclude<R, Scope.Scope>>, cd: (_: Effect.Effect<A, E, Exclude<R, Scope.Scope>>) => Effect.Effect<...>): Effect.Effect<...> (+21 overloads)pipe(
import OptionOption.const isSome: <A>(
self: Option<A>
) => self is Some<A>
Checks whether an Option contains a value (Some).
When to use
Use when you need to branch on a present Option before accessing .value.
Details
- Acts as a type guard, narrowing to
Some<A>
Example (Checking for Some)
import { Option } from "effect"
console.log(Option.isSome(Option.some(1)))
// Output: true
console.log(Option.isSome(Option.none()))
// Output: false
isSome(const oentry: Option.Option<Entry<A, E>>oentry) ? import effecteffect.const flatMap: {
<A, B, E2, R2>(
f: (a: A) => Effect.Effect<B, E2, R2>
): <E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<B, E | E2, R | R2>
<A, E, R, B, E2, R2>(
self: Effect.Effect<A, E, R>,
f: (a: A) => Effect.Effect<B, E2, R2>
): Effect.Effect<B, E | E2, R | R2>
}
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 oentry: Option.Some<Entry<A, E>>const oentry: {
_tag: "Some";
_op: "Some";
value: A;
valueOrUndefined: A;
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;
}
Some<Entry<A, E>>.value: Entry<A, E>(property) Some<Entry<A, E>>.value: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
Entry<A, E>.scope: Scope.Closeable(property) Entry<A, E>.scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import effecteffect.const exitVoid: Exit.Exit<void>exitVoid)) : const identity: <A>(a: A) => AReturns its input argument unchanged.
When to use
Use to return a value unchanged where a function is required.
Example (Returning the same value)
import { identity } from "effect"
import * as assert from "node:assert"
assert.deepStrictEqual(identity(5), 5)
identity,
import effecteffect.const flatMap: {
<A, B, E2, R2>(
f: (a: A) => Effect.Effect<B, E2, R2>
): <E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<B, E | E2, R | R2>
<A, E, R, B, E2, R2>(
self: Effect.Effect<A, E, R>,
f: (a: A) => Effect.Effect<B, E2, R2>
): Effect.Effect<B, E | E2, R | R2>
}
import ScopeScope.const provide: {
(value: Scope): <A, E, R>(
self: Effect<A, E, R>
) => Effect<A, E, Exclude<R, Scope>>
<A, E, R>(
self: Effect<A, E, R>,
value: Scope
): Effect<A, E, Exclude<R, Scope>>
}
restore: <A, E, R>(
effect: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, R>
self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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; <…;
}
ScopedCache<Key, A, E, R>.lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>lookup(key: Keykey)), const scope: Scope.Closeableconst scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import effecteffect.const onExit: {
<A, E, XE = never, XR = never>(
f: (
exit: Exit.Exit<A, E>
) => Effect.Effect<void, XE, XR>
): <R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<A, E | XE, R | XR>
<A, E, R, XE = never, XR = never>(
self: Effect.Effect<A, E, R>,
f: (
exit: Exit.Exit<A, E>
) => Effect.Effect<void, XE, XR>
): Effect.Effect<A, E | XE, R | XR>
}
exit: Exit.Exit<A, E>exit) => {
import DeferredDeferred.const doneUnsafe: <A, E>(
self: Deferred<A, E>,
effect: Effect<A, E>
) => boolean
Attempts to complete the Deferred synchronously with the specified
completion effect.
When to use
Use to complete a Deferred synchronously in low-level code that already has
the completion effect.
Details
This mutates the Deferred directly and should be reserved for low-level
code; prefer the effectful completion APIs when possible. Returns true if
this call completed the Deferred, or false if it was already completed.
Example (Completing a Deferred unsafely)
import { Deferred, Effect } from "effect"
const deferred = Deferred.makeUnsafe<number>()
const success = Deferred.doneUnsafe(deferred, Effect.succeed(42))
console.log(success) // true
doneUnsafe(const deferred: Deferred.Deferred<A, E>const deferred: {
effect: Effect<A, E>;
resumes: Array<(effect: Effect<A, E>) => void> | undefined;
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; <…;
}
exit: Exit.Exit<A, E>exit)
const const ttl: Duration.Durationconst ttl: {
value: DurationValue;
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;
}
self: ScopedCache<Key, A, E, R>(parameter) self: {
state: State<Key, A, E>;
capacity: number;
lookup: (key: Key) => Effect.Effect<A, E, R | Scope.Scope>;
timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.Duration;
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; <…;
}
ScopedCache<Key, A, E, R>.timeToLive: (exit: Exit.Exit<A, E>, key: Key) => Duration.DurationtimeToLive(exit: Exit.Exit<A, E>exit, key: Keykey)
if (import DurationDuration.const isFinite: (
self: Duration
) => boolean
Checks whether a Duration is finite (not infinite).
Example (Checking finite durations)
import { Duration } from "effect"
console.log(Duration.isFinite(Duration.seconds(5))) // true
console.log(Duration.isFinite(Duration.infinity)) // false
isFinite(const ttl: Duration.Durationconst ttl: {
value: DurationValue;
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 entry: Entry<A, E>const entry: {
expiresAt: number | undefined;
deferred: Deferred.Deferred<A, E>;
scope: Scope.Closeable;
}
Entry<A, E>.expiresAt: number | undefinedexpiresAt = fiber: effect.FiberImpl<unknown, unknown>(parameter) fiber: {
id: number;
interruptible: boolean;
currentOpCount: number;
currentLoopCount: number;
_stack: Array<Primitive>;
_observers: Array<(exit: Exit.Exit<A, E>) => void>;
_exit: Exit.Exit<A, E> | undefined;
_currentExit: Exit.Exit<A, E> | undefined;
_children: Set<FiberImpl<any, any>> | undefined;
_interruptedCause: Cause.Cause<never> | undefined;
_yielded: Exit.Exit<any, any> | (() => void) | undefined;
context: Context.Context<never>;
currentScheduler: Scheduler.Scheduler;
currentTracerContext: Tracer.Tracer["context"];
currentSpan: Tracer.AnySpan | undefined;
currentLogLevel: LogLevel.LogLevel;
minimumLogLevel: LogLevel.LogLevel;
currentStackFrame: StackFrame | undefined;
runtimeMetrics: Metric.FiberRuntimeMetricsService | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
_dispatcher: Scheduler.SchedulerDispatcher | undefined;
currentDispatcher: SchedulerDispatcher;
getRef: <X>(ref: Context.Reference<X>) => X;
addObserver: (cb: (exit: Exit.Exit<unknown, unknown>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit.Exit<unknown, unknown> | undefined;
evaluate: (effect: core.Primitive) => void;
runLoop: (effect: core.Primitive) => typeof core.Yield | Exit.Exit<unknown, unknown>;
getCont: <S extends core.contA | core.contE>(symbol: S) => (core.Primitive & Record<S, (value: any, fiber: effect.FiberImpl) => core.Primitive>) | undefined;
yieldWith: (value: Exit.Exit<any, any> | (() => void)) => core.Yield;
children: () => Set<Fiber.Fiber<any, any>>;
pipe: () => unknown;
setContext: (context: Context.Context<never>) => void;
currentSpanLocal: Span | undefined;
}
FiberImpl<X>(ref: Context.Reference<X>): XgetRef(import effecteffect.const ClockRef: Context.Reference<Clock>const ClockRef: {
key: string;
Service: {
currentTimeMillisUnsafe: () => number;
currentTimeMillis: Effect<number>;
currentTimeNanosUnsafe: () => bigint;
currentTimeNanos: Effect<bigint>;
sleep: (duration: Duration.Duration) => Effect<void>;
};
defaultValue: () => Shape;
of: (this: void, self: Clock) => Clock;
context: (self: Clock) => Context.Context<never>;
use: (f: (service: Clock) => Effect.Effect<A, E, R>) => Effect.Effect<A, E, R>;
useSync: (f: (service: Clock) => A) => Effect.Effect<A, never, never>;
Identifier: Identifier;
stack: string | undefined;
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;
}
Clock.currentTimeMillisUnsafe(): numberReturns the current time in milliseconds unsafely.
When to use
Use to read millisecond time synchronously when you already have a Clock
service and can accept non-effectful access.
currentTimeMillisUnsafe() + import DurationDuration.const toMillis: (self: Input) => numberConverts a Duration to milliseconds.
Example (Converting durations to milliseconds)
import { Duration } from "effect"
console.log(Duration.toMillis(Duration.seconds(5))) // 5000
console.log(Duration.toMillis(Duration.minutes(2))) // 120000
toMillis(const ttl: Duration.Durationconst ttl: {
value: DurationValue;
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 void: Effect.Effect<void, never, never>(alias) const void: {
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;
}