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allow catching multiple different tags in Effect.catchTag #4796

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Merged
tim-smart merged 3 commits into from
Apr 29, 2025
Merged

allow catching multiple different tags in Effect.catchTag #4796

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a24974a
allow catching multiple different tags in Effect.catchTag
tim-smart Apr 27, 2025
9a69890
NoInfer
tim-smart Apr 27, 2025
a9387b1
improve completion
tim-smart Apr 28, 2025
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5 changes: 5 additions & 0 deletions .changeset/sweet-maps-return.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"effect": minor
---

allow catching multiple different tags in Effect.catchTag
14 changes: 6 additions & 8 deletions packages/effect/src/Effect.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3861,15 +3861,13 @@ export const catchSomeDefect: {
* @category Error handling
*/
export const catchTag: {
<K extends E extends { _tag: string } ? E["_tag"] : never, E, A1, E1, R1>(
k: K,
f: (e: NoInfer<Extract<E, { _tag: K }>>) => Effect<A1, E1, R1>
): <A, R>(self: Effect<A, E, R>) => Effect<A1 | A, E1 | Exclude<E, { _tag: K }>, R1 | R>
<A, E, R, K extends E extends { _tag: string } ? E["_tag"] : never, R1, E1, A1>(
<E, const K extends RA.NonEmptyReadonlyArray<E extends { _tag: string } ? E["_tag"] : never>, A1, E1, R1>(
...args: [...tags: K, f: (e: Extract<NoInfer<E>, { _tag: K[number] }>) => Effect<A1, E1, R1>]
): <A, R>(self: Effect<A, E, R>) => Effect<A | A1, Exclude<E, { _tag: K[number] }> | E1, R | R1>
<A, E, R, const K extends RA.NonEmptyReadonlyArray<E extends { _tag: string } ? E["_tag"] : never>, R1, E1, A1>(
self: Effect<A, E, R>,
k: K,
f: (e: Extract<E, { _tag: K }>) => Effect<A1, E1, R1>
): Effect<A | A1, E1 | Exclude<E, { _tag: K }>, R | R1>
...args: [...tags: K, f: (e: Extract<NoInfer<E>, { _tag: K[number] }>) => Effect<A1, E1, R1>]
): Effect<A | A1, Exclude<E, { _tag: K[number] }> | E1, R | R1>
} = effect.catchTag

/**
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43 changes: 29 additions & 14 deletions packages/effect/src/internal/core-effect.ts
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Expand Up @@ -237,21 +237,36 @@ export const catchSomeDefect = dual<

/* @internal */
export const catchTag = dual<
<K extends (E extends { _tag: string } ? E["_tag"] : never), E, A1, E1, R1>(
k: K,
f: (e: Extract<E, { _tag: K }>) => Effect.Effect<A1, E1, R1>
) => <A, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A | A1, Exclude<E, { _tag: K }> | E1, R | R1>,
<A, E, R, K extends (E extends { _tag: string } ? E["_tag"] : never), R1, E1, A1>(
<E, const K extends Arr.NonEmptyReadonlyArray<E extends { _tag: string } ? E["_tag"] : never>, A1, E1, R1>(
...args: [...tags: K, f: (e: Extract<NoInfer<E>, { _tag: K[number] }>) => Effect.Effect<A1, E1, R1>]
) => <A, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A | A1, Exclude<E, { _tag: K[number] }> | E1, R | R1>,
<A, E, R, const K extends Arr.NonEmptyReadonlyArray<E extends { _tag: string } ? E["_tag"] : never>, R1, E1, A1>(
self: Effect.Effect<A, E, R>,
k: K,
f: (e: Extract<E, { _tag: K }>) => Effect.Effect<A1, E1, R1>
) => Effect.Effect<A | A1, Exclude<E, { _tag: K }> | E1, R | R1>
>(3, <A, E, R, K extends (E extends { _tag: string } ? E["_tag"] : never), R1, E1, A1>(
self: Effect.Effect<A, E, R>,
k: K,
f: (e: Extract<E, { _tag: K }>) => Effect.Effect<A1, E1, R1>
): Effect.Effect<A | A1, Exclude<E, { _tag: K }> | E1, R | R1> =>
core.catchIf(self, Predicate.isTagged(k) as Predicate.Refinement<E, Extract<E, { _tag: K }>>, f) as any)
...args: [...tags: K, f: (e: Extract<NoInfer<E>, { _tag: K[number] }>) => Effect.Effect<A1, E1, R1>]
) => Effect.Effect<A | A1, Exclude<E, { _tag: K[number] }> | E1, R | R1>
>(
(args: any) => core.isEffect(args[0]),
<A, E, R, const K extends Arr.NonEmptyReadonlyArray<E extends { _tag: string } ? E["_tag"] : never>, R1, E1, A1>(
self: Effect.Effect<A, E, R>,
...args: [...tags: K, f: (e: Extract<NoInfer<E>, { _tag: K[number] }>) => Effect.Effect<A1, E1, R1>]
): Effect.Effect<A | A1, Exclude<E, { _tag: K[number] }> | E1, R | R1> => {
const f = args[args.length - 1] as any
let predicate: Predicate.Predicate<E>
if (args.length === 2) {
predicate = Predicate.isTagged(args[0] as string)
} else {
predicate = (e) => {
const tag = Predicate.hasProperty(e, "_tag") ? e["_tag"] : undefined
if (!tag) return false
for (let i = 0; i < args.length - 1; i++) {
if (args[i] === tag) return true
}
return false
}
}
return core.catchIf(self, predicate as Predicate.Refinement<E, Extract<E, { _tag: K[number] }>>, f) as any
}
)

/** @internal */
export const catchTags: {
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