<A, E, XE extends E, XA extends A>(
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?: boolean | undefined
}
): (self: FiberHandle<A, E>) => Effect.Effect<void>
<A, E, XE extends E, XA extends A>(
self: FiberHandle<A, E>,
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?: boolean | undefined
}
): Effect.Effect<void>Sets the fiber in the FiberHandle.
Details
When the fiber completes, it will be removed from the FiberHandle. If a
fiber already exists in the FiberHandle, it will be interrupted unless
options.onlyIfMissing is set.
Example (Setting a fiber safely)
import { Effect, Fiber, FiberHandle } from "effect"
Effect.gen(function*() {
const handle = yield* FiberHandle.make()
const fiber = Effect.runFork(Effect.succeed("hello"))
// Set the fiber safely
yield* FiberHandle.set(handle, fiber)
// The fiber is now managed by the handle
const result = yield* Fiber.await(fiber)
console.log(result) // "hello"
})combinators
Source effect/FiberHandle.ts:37730 lines
export const const set: {
<A, E, XE extends E, XA extends A>(
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
): (
self: FiberHandle<A, E>
) => Effect.Effect<void>
<A, E, XE extends E, XA extends A>(
self: FiberHandle<A, E>,
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
): Effect.Effect<void>
}
Sets the fiber in the FiberHandle.
Details
When the fiber completes, it will be removed from the FiberHandle. If a
fiber already exists in the FiberHandle, it will be interrupted unless
options.onlyIfMissing is set.
Example (Setting a fiber safely)
import { Effect, Fiber, FiberHandle } from "effect"
Effect.gen(function*() {
const handle = yield* FiberHandle.make()
const fiber = Effect.runFork(Effect.succeed("hello"))
// Set the fiber safely
yield* FiberHandle.set(handle, fiber)
// The fiber is now managed by the handle
const result = yield* Fiber.await(fiber)
console.log(result) // "hello"
})
set: {
<function (type parameter) A in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) XA in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) A in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
fiber: Fiber.Fiber<XA, XE>(parameter) fiber: {
id: number;
currentOpCount: number;
getRef: <A>(ref: Context.Reference<A>) => A;
context: Context.Context<never>;
setContext: (context: Context.Context<never>) => void;
currentScheduler: Scheduler;
currentDispatcher: SchedulerDispatcher;
currentSpan: AnySpan | undefined;
currentLogLevel: LogLevel;
minimumLogLevel: LogLevel;
currentStackFrame: StackFrame | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
addObserver: (cb: (exit: Exit<A, E>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit<A, E> | 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 FiberFiber.type Fiber.Fiber = /*unresolved*/ anyFiber<function (type parameter) XA in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
options: | {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
| undefined
onlyIfMissing?: boolean | undefinedonlyIfMissing?: boolean
readonly propagateInterruption?: boolean | undefinedpropagateInterruption?: boolean | undefined
}
): (self: FiberHandle<A, E>(parameter) self: {
deferred: Deferred.Deferred<void, unknown>;
state: { readonly _tag: "Open"; fiber: Fiber.Fiber<A, E> | undefined } | { readonly _tag: "Closed" };
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;
}
interface FiberHandle<out A = unknown, out E = unknown>Scoped handle that manages at most one fiber, interrupts the current fiber
when the handle's scope closes, and removes managed fibers from the handle
when they complete.
Example (Managing a single fiber)
import { Effect, Fiber, FiberHandle } from "effect"
Effect.gen(function*() {
// Create a FiberHandle that can hold fibers producing strings
const handle = yield* FiberHandle.make<string, never>()
// The handle can store and manage a single fiber
const fiber = yield* FiberHandle.run(handle, Effect.succeed("hello"))
const result = yield* Fiber.await(fiber)
console.log(result) // "hello"
})
FiberHandle<function (type parameter) A in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): (self: FiberHandle<A, E>) => Effect.Effect<void>
import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void>
<function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XA in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
self: FiberHandle<A, E>(parameter) self: {
deferred: Deferred.Deferred<void, unknown>;
state: { readonly _tag: "Open"; fiber: Fiber.Fiber<A, E> | undefined } | { readonly _tag: "Closed" };
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;
}
interface FiberHandle<out A = unknown, out E = unknown>Scoped handle that manages at most one fiber, interrupts the current fiber
when the handle's scope closes, and removes managed fibers from the handle
when they complete.
Example (Managing a single fiber)
import { Effect, Fiber, FiberHandle } from "effect"
Effect.gen(function*() {
// Create a FiberHandle that can hold fibers producing strings
const handle = yield* FiberHandle.make<string, never>()
// The handle can store and manage a single fiber
const fiber = yield* FiberHandle.run(handle, Effect.succeed("hello"))
const result = yield* Fiber.await(fiber)
console.log(result) // "hello"
})
FiberHandle<function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
fiber: Fiber.Fiber<XA, XE>(parameter) fiber: {
id: number;
currentOpCount: number;
getRef: <A>(ref: Context.Reference<A>) => A;
context: Context.Context<never>;
setContext: (context: Context.Context<never>) => void;
currentScheduler: Scheduler;
currentDispatcher: SchedulerDispatcher;
currentSpan: AnySpan | undefined;
currentLogLevel: LogLevel;
minimumLogLevel: LogLevel;
currentStackFrame: StackFrame | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
addObserver: (cb: (exit: Exit<A, E>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit<A, E> | 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 FiberFiber.type Fiber.Fiber = /*unresolved*/ anyFiber<function (type parameter) XA in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
options: | {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
| undefined
onlyIfMissing?: boolean | undefinedonlyIfMissing?: boolean
readonly propagateInterruption?: boolean | undefinedpropagateInterruption?: boolean | undefined
}
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void>
} = dual<(...args: Array<any>) => any, <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}) => Effect.Effect<void>>(isDataFirst: (args: IArguments) => boolean, body: <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}) => Effect.Effect<void>): ((...args: Array<any>) => any) & (<A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}) => Effect.Effect<void>) (+1 overload)
Creates a function that can be called in data-first style or data-last
(pipe-friendly) style.
When to use
Use to expose one implementation through both direct and pipe-friendly
call styles.
Details
Pass either the arity of the uncurried function or a predicate that decides
whether the current call is data-first. Arity is the common case. Use a
predicate when optional arguments make arity ambiguous.
Example (Selecting data-first or data-last style by arity)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(2, (self, that) => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Defining overloads with call signatures)
import { Function, pipe } from "effect"
const sum: {
(that: number): (self: number) => number
(self: number, that: number): number
} = Function.dual(2, (self: number, that: number): number => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Selecting data-first or data-last style with a predicate)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(
(args) => args.length === 2,
(self, that) => self + that
)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
dual((args: IArgumentsargs) => const isFiberHandle: (
u: unknown
) => u is FiberHandle
Returns true if a value is a FiberHandle by checking for the
FiberHandle runtime marker.
Example (Checking fiber handles)
import { Effect, FiberHandle } from "effect"
Effect.gen(function*() {
const handle = yield* FiberHandle.make()
console.log(FiberHandle.isFiberHandle(handle)) // true
console.log(FiberHandle.isFiberHandle("not a handle")) // false
})
isFiberHandle(args: IArgumentsargs[0]), <function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XA in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
self: FiberHandle<A, E>(parameter) self: {
deferred: Deferred.Deferred<void, unknown>;
state: { readonly _tag: "Open"; fiber: Fiber.Fiber<A, E> | undefined } | { readonly _tag: "Closed" };
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;
}
interface FiberHandle<out A = unknown, out E = unknown>Scoped handle that manages at most one fiber, interrupts the current fiber
when the handle's scope closes, and removes managed fibers from the handle
when they complete.
Example (Managing a single fiber)
import { Effect, Fiber, FiberHandle } from "effect"
Effect.gen(function*() {
// Create a FiberHandle that can hold fibers producing strings
const handle = yield* FiberHandle.make<string, never>()
// The handle can store and manage a single fiber
const fiber = yield* FiberHandle.run(handle, Effect.succeed("hello"))
const result = yield* Fiber.await(fiber)
console.log(result) // "hello"
})
FiberHandle<function (type parameter) A in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) E in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
fiber: Fiber.Fiber<XA, XE>(parameter) fiber: {
id: number;
currentOpCount: number;
getRef: <A>(ref: Context.Reference<A>) => A;
context: Context.Context<never>;
setContext: (context: Context.Context<never>) => void;
currentScheduler: Scheduler;
currentDispatcher: SchedulerDispatcher;
currentSpan: AnySpan | undefined;
currentLogLevel: LogLevel;
minimumLogLevel: LogLevel;
currentStackFrame: StackFrame | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
addObserver: (cb: (exit: Exit<A, E>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit<A, E> | 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 FiberFiber.type Fiber.Fiber = /*unresolved*/ anyFiber<function (type parameter) XA in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
function (type parameter) XE in <A, E, XE extends E, XA extends A>(self: FiberHandle<A, E>, fiber: Fiber.Fiber<XA, XE>, options?: {
readonly onlyIfMissing?: boolean;
readonly propagateInterruption?: boolean | undefined;
}): Effect.Effect<void>
options: | {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
| undefined
onlyIfMissing?: boolean | undefinedonlyIfMissing?: boolean
readonly propagateInterruption?: boolean | undefinedpropagateInterruption?: boolean | undefined
}
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void> =>
import EffectEffect.sync(() =>
const setUnsafe: {
<A, E, XE extends E, XA extends A>(
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean | undefined
readonly propagateInterruption?:
| boolean
| undefined
}
): (self: FiberHandle<A, E>) => void
<A, E, XE extends E, XA extends A>(
self: FiberHandle<A, E>,
fiber: Fiber.Fiber<XA, XE>,
options?: {
readonly onlyIfMissing?: boolean | undefined
readonly propagateInterruption?:
| boolean
| undefined
}
): void
}
self: FiberHandle<A, E>(parameter) self: {
deferred: Deferred.Deferred<void, unknown>;
state: { readonly _tag: "Open"; fiber: Fiber.Fiber<A, E> | undefined } | { readonly _tag: "Closed" };
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;
}
fiber: Fiber.Fiber<XA, XE>(parameter) fiber: {
id: number;
currentOpCount: number;
getRef: <A>(ref: Context.Reference<A>) => A;
context: Context.Context<never>;
setContext: (context: Context.Context<never>) => void;
currentScheduler: Scheduler;
currentDispatcher: SchedulerDispatcher;
currentSpan: AnySpan | undefined;
currentLogLevel: LogLevel;
minimumLogLevel: LogLevel;
currentStackFrame: StackFrame | undefined;
maxOpsBeforeYield: number;
currentPreventYield: boolean;
addObserver: (cb: (exit: Exit<A, E>) => void) => () => void;
interruptUnsafe: (fiberId?: number | undefined, annotations?: Context.Context<never> | undefined) => void;
pollUnsafe: () => Exit<A, E> | 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; <…;
}
onlyIfMissing?: boolean | undefinedonlyIfMissing: options: | {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
| undefined
onlyIfMissing?: boolean | undefinedonlyIfMissing,
propagateInterruption?: boolean | undefinedpropagateInterruption: options: | {
readonly onlyIfMissing?: boolean
readonly propagateInterruption?:
| boolean
| undefined
}
| undefined
propagateInterruption?: boolean | undefinedpropagateInterruption
})
))