Indicates an enqueue was attempted after the queue was shut down. In practice this is logged as a warning and the items are dropped — this error type exists for programmatic detection in tests/monitoring.
export class class QueueShutdownErrorclass QueueShutdownError {
name: string;
message: string;
stack: string;
cause: unknown;
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;
_tag: Tag;
queue: string;
}
Indicates an enqueue was attempted after the queue was shut down.
In practice this is logged as a warning and the items are dropped —
this error type exists for programmatic detection in tests/monitoring.
QueueShutdownError extends import DataData.const TaggedError: <"QueueShutdownError">(tag: "QueueShutdownError") => new <A>(args: Types.VoidIfEmpty<{ readonly [P in keyof A as P extends "_tag" ? never : P]: A[P]; }>) => Cause.YieldableError & {
readonly _tag: "QueueShutdownError";
} & Readonly<A>
Creates a tagged error class with a _tag discriminator.
When to use
Use when you need domain errors with discriminated-union handling.
Details
Like
Error
, but instances also carry a readonly _tag property,
enabling Effect.catchTag and Effect.catchTags for tag-based recovery.
The _tag is excluded from the constructor argument. Yielding an instance
inside Effect.gen fails the effect with this error.
Example (Recovering by tag)
import { Data, Effect } from "effect"
class NotFound extends Data.TaggedError("NotFound")<{
readonly resource: string
}> {}
class Forbidden extends Data.TaggedError("Forbidden")<{
readonly reason: string
}> {}
const program = Effect.gen(function*() {
return yield* new NotFound({ resource: "/users/42" })
})
const recovered = program.pipe(
Effect.catchTag("NotFound", (e) =>
Effect.succeed(`missing: ${e.resource}`))
)
TaggedError(
"QueueShutdownError",
)<{
readonly queue: stringqueue: string;
}> {}