listen no longer binds a transport. Use the protocol entry instead.
errorslisten
Source src/internal/nodeCore.ts:114811 lines
export class class ListenUseProtocolclass ListenUseProtocol {
message: string;
name: 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;
protocol: 'unix' | 'http' | 'ws';
detail: string;
}
listen
no longer binds a transport. Use the protocol entry instead.
ListenUseProtocol extends import DataData.const TaggedError: <Tag extends string>(
tag: Tag
) => new <A extends Record<string, any> = {}>(
args: Types.VoidIfEmpty<{
readonly [P in keyof A as P extends "_tag"
? never
: P]: A[P]
}>
) => Cause.YieldableError & {
readonly _tag: Tag
} & 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: ${e.resource}`))
)
TaggedError("ListenUseProtocol")<{
readonly protocol: "unix" | "http" | "ws"protocol: "unix" | "http" | "ws";
readonly detail: stringdetail: string;
}> {
override get ListenUseProtocol.message: stringmessage() {
return (
`Node.listen does not bind a transport (${this.detail: stringdetail}). ` +
`Use Node.${this.protocol: "unix" | "http" | "ws"protocol}(…) for that protocol.`
);
}
}