<ROut, XR extends ROut, RIn2, E2, X>(
f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>
): <RIn, E>(
self: Layer<ROut, E, RIn>
) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>
<RIn, E, ROut, XR extends ROut, RIn2, E2, X>(
self: Layer<ROut, E, RIn>,
f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>
): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>Performs the specified effect if this layer succeeds.
When to use
Use to run an effectful observation after a layer has been built successfully, such as logging or metrics, without changing the services the layer provides.
Details
The callback receives the services produced by this layer. Its result is discarded, and the original layer output is preserved.
Source effect/Layer.ts:163718 lines
export const const tap: {
<ROut, XR extends ROut, RIn2, E2, X>(
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
): <RIn, E>(
self: Layer<ROut, E, RIn>
) => Layer<
ROut,
E | E2,
RIn | Exclude<RIn2, Scope.Scope>
>
<RIn, E, ROut, XR extends ROut, RIn2, E2, X>(
self: Layer<ROut, E, RIn>,
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
): Layer<
ROut,
E | E2,
RIn | Exclude<RIn2, Scope.Scope>
>
}
Performs the specified effect if this layer succeeds.
When to use
Use to run an effectful observation after a layer has been built
successfully, such as logging or metrics, without changing the services the
layer provides.
Details
The callback receives the services produced by this layer. Its result is
discarded, and the original layer output is preserved.
tap: {
<function (type parameter) ROut in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) XR in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR extends function (type parameter) ROut in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) RIn2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, function (type parameter) E2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) X in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X>(
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
context: Context.Context<XR>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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 ContextContext.type Context.Context = /*unresolved*/ anyContext<function (type parameter) XR in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR>) => import EffectEffect<function (type parameter) X in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X, function (type parameter) E2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2>
): <function (type parameter) RIn in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn, function (type parameter) E in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E>(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 <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E, function (type parameter) RIn in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn>) => 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 <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E | function (type parameter) E2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn in <RIn, E>(self: Layer<ROut, E, RIn>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn | type Exclude<T, U> = T extends U
? never
: T
Exclude from T those types that are assignable to U
Exclude<function (type parameter) RIn2 in <ROut, XR extends ROut, RIn2, E2, X>(f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): <RIn, E>(self: Layer<ROut, E, RIn>) => Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, import ScopeScope.Scope>>
<function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E, function (type parameter) ROut in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) XR in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR extends function (type parameter) ROut in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) X in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X>(
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, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E, function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn>,
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
context: Context.Context<XR>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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 ContextContext.type Context.Context = /*unresolved*/ anyContext<function (type parameter) XR in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR>) => import EffectEffect<function (type parameter) X in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X, function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2>
): 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, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E | function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn | type Exclude<T, U> = T extends U
? never
: T
Exclude from T those types that are assignable to U
Exclude<function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, import ScopeScope.Scope>>
} = import dualdual(2, <function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E, function (type parameter) ROut in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) XR in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR extends function (type parameter) ROut in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) X in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X>(
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, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E, function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn>,
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
context: Context.Context<XR>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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 ContextContext.type Context.Context = /*unresolved*/ anyContext<function (type parameter) XR in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR>) => import EffectEffect<function (type parameter) X in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>X, function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2>
): 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, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>ROut, function (type parameter) E in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E | function (type parameter) E2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>E2, function (type parameter) RIn in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn | type Exclude<T, U> = T extends U
? never
: T
Exclude from T those types that are assignable to U
Exclude<function (type parameter) RIn2 in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>RIn2, import ScopeScope.Scope>> =>
const fromBuild: <ROut, E, RIn>(
build: (
memoMap: MemoMap,
scope: Scope.Scope
) => Effect<Context.Context<ROut>, E, RIn>
) => Layer<ROut, E, RIn>
Constructs a Layer from a function that uses a MemoMap and Scope to
build the layer.
Details
The function receives a MemoMap for memoization and a Scope for resource management.
A child scope is created, and if the build fails, the child scope is closed.
Example (Constructing a layer from a build function)
import { Context, Effect, Layer } from "effect"
class Database extends Context.Service<Database, {
readonly query: (sql: string) => Effect.Effect<string>
}>()("Database") {}
const databaseLayer = Layer.fromBuild(() =>
Effect.sync(() =>
Context.make(Database, {
query: (sql: string) => Effect.succeed("result")
})
)
)
fromBuild((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 internalEffectinternalEffect.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>
}
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;
}
context: Context.Context<ROut>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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 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>>
}
import internalEffectinternalEffect.const as: {
<A, B>(value: B): <E, R>(
self: Effect.Effect<A, E, R>
) => Effect.Effect<B, E, R>
<A, E, R, B>(
self: Effect.Effect<A, E, R>,
value: B
): Effect.Effect<B, E, R>
}
f: (
context: Context.Context<XR>
) => Effect<X, E2, RIn2>
context: Context.Context<ROut>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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 ContextContext.type Context.Context = /*unresolved*/ anyContext<function (type parameter) XR in <RIn, E, ROut, XR extends ROut, RIn2, E2, X>(self: Layer<ROut, E, RIn>, f: (context: Context.Context<XR>) => Effect<X, E2, RIn2>): Layer<ROut, E | E2, RIn | Exclude<RIn2, Scope.Scope>>XR>), context: Context.Context<ROut>(parameter) context: {
mapUnsafe: ReadonlyMap<string, any>;
mutable: boolean;
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;
}