(memoMap: MemoMap, scope: Scope.Scope): <RIn, E, ROut>(
self: Layer<ROut, E, RIn>
) => Effect<Context.Context<ROut>, E, RIn>
<RIn, E, ROut>(
self: Layer<ROut, E, RIn>,
memoMap: MemoMap,
scope: Scope.Scope
): Effect<Context.Context<ROut>, E, RIn>Builds a layer into an Effect value, using the specified MemoMap to memoize
the layer construction.
Example (Building layers with an explicit memo map)
import { Context, Effect, Layer } from "effect"
class Database extends Context.Service<Database, {
readonly query: (sql: string) => Effect.Effect<string>
}>()("Database") {}
class Logger extends Context.Service<Logger, {
readonly log: (msg: string) => Effect.Effect<void>
}>()("Logger") {}
// Build layers with explicit memoization control
const program = Effect.gen(function*() {
const memoMap = yield* Layer.makeMemoMap
const scope = yield* Effect.scope
// Build database layer with memoization
const dbLayer = Layer.succeed(Database, {
query: Effect.fn("Database.query")((sql: string) => Effect.succeed("result"))
})
const dbContext = yield* Layer.buildWithMemoMap(dbLayer, memoMap, scope)
// Build logger layer with same memoization (reuses memo if same layer)
const loggerLayer = Layer.succeed(Logger, {
log: Effect.fn("Logger.log")((msg: string) => Effect.sync(() => console.log(msg)))
})
const loggerContext = yield* Layer.buildWithMemoMap(
loggerLayer,
memoMap,
scope
)
return {
database: Context.get(dbContext, Database),
logger: Context.get(loggerContext, Logger)
}
})export const const buildWithMemoMap: {
(memoMap: MemoMap, scope: Scope.Scope): <
RIn,
E,
ROut
>(
self: Layer<ROut, E, RIn>
) => Effect<Context.Context<ROut>, E, RIn>
<RIn, E, ROut>(
self: Layer<ROut, E, RIn>,
memoMap: MemoMap,
scope: Scope.Scope
): Effect<Context.Context<ROut>, E, RIn>
}
Builds a layer into an Effect value, using the specified MemoMap to memoize
the layer construction.
Example (Building layers with an explicit memo map)
import { Context, Effect, Layer } from "effect"
class Database extends Context.Service<Database, {
readonly query: (sql: string) => Effect.Effect<string>
}>()("Database") {}
class Logger extends Context.Service<Logger, {
readonly log: (msg: string) => Effect.Effect<void>
}>()("Logger") {}
// Build layers with explicit memoization control
const program = Effect.gen(function*() {
const memoMap = yield* Layer.makeMemoMap
const scope = yield* Effect.scope
// Build database layer with memoization
const dbLayer = Layer.succeed(Database, {
query: Effect.fn("Database.query")((sql: string) => Effect.succeed("result"))
})
const dbContext = yield* Layer.buildWithMemoMap(dbLayer, memoMap, scope)
// Build logger layer with same memoization (reuses memo if same layer)
const loggerLayer = Layer.succeed(Logger, {
log: Effect.fn("Logger.log")((msg: string) => Effect.sync(() => console.log(msg)))
})
const loggerContext = yield* Layer.buildWithMemoMap(
loggerLayer,
memoMap,
scope
)
return {
database: Context.get(dbContext, Database),
logger: Context.get(loggerContext, Logger)
}
})
buildWithMemoMap: {
(
memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}
scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.Scope
): <function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>RIn, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>ROut>(self: Layer<ROut, E, RIn>(parameter) self: {
build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>;
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 Layer<in ROut, out E = never, out RIn = never>A Layer describes how to build one or more services for dependency injection.
When to use
Use to model construction of application services for dependency injection,
especially when services have dependencies, can fail during construction, or
need scoped setup and release.
Details
A Layer<ROut, E, RIn> represents ROut as the services this layer
provides, E as the possible errors during layer construction, and RIn as
the services this layer requires as dependencies.
Layer<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>ROut, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>RIn>) => 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 ContextContext.interface Context<in Services>Immutable collection of service implementations used for dependency
injection in Effect programs.
Details
The type parameter tracks the service identifiers available in the context.
At runtime, services are stored by each key's string key.
Example (Creating a context with multiple services)
import { Context } from "effect"
// Create a context with multiple services
const Logger = Context.Service<{ log: (msg: string) => void }>("Logger")
const Database = Context.Service<{ query: (sql: string) => string }>(
"Database"
)
const context = Context.make(Logger, {
log: (msg: string) => console.log(msg)
})
.pipe(Context.add(Database, { query: (sql) => `Result: ${sql}` }))
Context<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>ROut>, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>): Effect<Context.Context<ROut>, E, RIn>RIn>
<function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut>(
self: Layer<ROut, E, RIn>(parameter) self: {
build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>;
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 Layer<in ROut, out E = never, out RIn = never>A Layer describes how to build one or more services for dependency injection.
When to use
Use to model construction of application services for dependency injection,
especially when services have dependencies, can fail during construction, or
need scoped setup and release.
Details
A Layer<ROut, E, RIn> represents ROut as the services this layer
provides, E as the possible errors during layer construction, and RIn as
the services this layer requires as dependencies.
Layer<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn>,
memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}
scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.Scope
): 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 ContextContext.interface Context<in Services>Immutable collection of service implementations used for dependency
injection in Effect programs.
Details
The type parameter tracks the service identifiers available in the context.
At runtime, services are stored by each key's string key.
Example (Creating a context with multiple services)
import { Context } from "effect"
// Create a context with multiple services
const Logger = Context.Service<{ log: (msg: string) => void }>("Logger")
const Database = Context.Service<{ query: (sql: string) => string }>(
"Database"
)
const context = Context.make(Logger, {
log: (msg: string) => console.log(msg)
})
.pipe(Context.add(Database, { query: (sql) => `Result: ${sql}` }))
Context<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut>, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn>
} = dual<(...args: Array<any>) => any, <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>>(arity: 3, body: <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>): ((...args: Array<any>) => any) & (<RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) (+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(3, <function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut>(
self: Layer<ROut, E, RIn>(parameter) self: {
build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>;
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 Layer<in ROut, out E = never, out RIn = never>A Layer describes how to build one or more services for dependency injection.
When to use
Use to model construction of application services for dependency injection,
especially when services have dependencies, can fail during construction, or
need scoped setup and release.
Details
A Layer<ROut, E, RIn> represents ROut as the services this layer
provides, E as the possible errors during layer construction, and RIn as
the services this layer requires as dependencies.
Layer<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn>,
memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}
scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ScopeScope.Scope
): 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 ContextContext.interface Context<in Services>Immutable collection of service implementations used for dependency
injection in Effect programs.
Details
The type parameter tracks the service identifiers available in the context.
At runtime, services are stored by each key's string key.
Example (Creating a context with multiple services)
import { Context } from "effect"
// Create a context with multiple services
const Logger = Context.Service<{ log: (msg: string) => void }>("Logger")
const Database = Context.Service<{ query: (sql: string) => string }>(
"Database"
)
const context = Context.make(Logger, {
log: (msg: string) => console.log(msg)
})
.pipe(Context.add(Database, { query: (sql) => `Result: ${sql}` }))
Context<function (type parameter) ROut in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>ROut>, function (type parameter) E in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>E, function (type parameter) RIn in <RIn, E, ROut>(self: Layer<ROut, E, RIn>, memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>RIn> =>
import internalEffectinternalEffect.const provideService: {
<I, S>(service: Context.Key<I, S>): {
(implementation: S): <A, E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, Exclude<R, I>>
<A, E, R>(
self: Effect.Effect<A, E, R>,
implementation: S
): Effect.Effect<A, E, Exclude<R, I>>
}
<I, S>(
key: Context.Key<I, S>,
implementation: S
): <A, E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<A, E, Exclude<R, I>>
<A, E, R, I, S>(
self: Effect.Effect<A, E, R>,
service: Context.Key<I, S>,
implementation: S
): Effect.Effect<A, E, Exclude<R, I>>
}
import internalEffectinternalEffect.const map: {
<A, B>(f: (a: A) => B): <E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<B, E, R>
<A, E, R, B>(
self: Effect.Effect<A, E, R>,
f: (a: A) => B
): Effect.Effect<B, E, R>
}
self: Layer<ROut, E, RIn>(parameter) self: {
build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>;
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; <…;
}
function Layer(memoMap: MemoMap, scope: Scope.Scope): Effect<Context.Context<ROut>, E, RIn>build(memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}
scope: Scope.Scope(parameter) scope: {
strategy: "sequential" | "parallel";
state: State.Open | State.Closed | State.Empty;
}
import ContextContext.const add: {
<I, S>(
key: Key<I, S>,
service: Types.NoInfer<S>
): <Services>(
self: Context<Services>
) => Context<Services | I>
<Services, I, S>(
self: Context<Services>,
key: Key<I, S>,
service: Types.NoInfer<S>
): Context<Services | I>
}
class CurrentMemoMapclass CurrentMemoMap {
key: Identifier;
Service: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
};
forkOrCreate: <Services>(self: Context.Context<Services>) => MemoMap;
of: (this: void, self: MemoMap) => MemoMap;
context: (self: MemoMap) => Context.Context<CurrentMemoMap>;
use: (f: (service: MemoMap) => Effect<A, E, R>) => Effect<A, E, CurrentMemoMap | R>;
useSync: (f: (service: MemoMap) => A) => Effect<A, never, CurrentMemoMap>;
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;
}
Context service for the current MemoMap used in layer construction.
When to use
Use when building custom layer operations that need to access the current
memoization map from the fiber context.
Details
This service wraps a MemoMap as a Context.Service, making it available
for dependency injection during layer construction.
CurrentMemoMap, memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}
class CurrentMemoMapclass CurrentMemoMap {
key: Identifier;
Service: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
};
forkOrCreate: <Services>(self: Context.Context<Services>) => MemoMap;
of: (this: void, self: MemoMap) => MemoMap;
context: (self: MemoMap) => Context.Context<CurrentMemoMap>;
use: (f: (service: MemoMap) => Effect<A, E, R>) => Effect<A, E, CurrentMemoMap | R>;
useSync: (f: (service: MemoMap) => A) => Effect<A, never, CurrentMemoMap>;
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;
}
Context service for the current MemoMap used in layer construction.
When to use
Use when building custom layer operations that need to access the current
memoization map from the fiber context.
Details
This service wraps a MemoMap as a Context.Service, making it available
for dependency injection during layer construction.
CurrentMemoMap,
memoMap: MemoMap(parameter) memoMap: {
get: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn> | undefined;
getOrElseMemoize: <RIn, E, ROut>(layer: Layer<ROut, E, RIn>, scope: Scope.Scope, build: (memoMap: MemoMap, scope: Scope.Scope) => Effect<Context.Context<ROut>, E, RIn>) => Effect<Context.Context<ROut>, E, RIn>;
}