effect-io-ai

Package: effect
Module: Exit

Exit.mapBoth

Transforms both the success value and typed error of an Exit.

When to use

Use when you need to remap both channels in one step.

Details

onSuccess transforms the value if the Exit is a Success. onFailure transforms the typed error if the Exit is a Failure with a Fail reason. Allocates a new Exit.

Gotchas

If the Cause contains only defects or interruptions, the failure passes through unchanged.

Example (Mapping both channels)

import { Data, Exit } from "effect"

class ExitError extends Data.TaggedError("ExitError")<{ readonly input: string }> {}

const exit = Exit.succeed(42)
const mapped = Exit.mapBoth(exit, {
  onSuccess: (x) => String(x),
  onFailure: (e: string) => new ExitError({ input: e })
})
console.log(Exit.isSuccess(mapped) && mapped.value) // "42"

See

• map to transform only the success value
• mapError to transform only the error

Signature

declare const mapBoth: { <E, E2, A, A2>(options: { readonly onFailure: (e: E) => E2; readonly onSuccess: (a: A) => A2; }): (self: Exit<A, E>) => Exit<A2, E2>; <A, E, E2, A2>(self: Exit<A, E>, options: { readonly onFailure: (e: E) => E2; readonly onSuccess: (a: A) => A2; }): Exit<A2, E2>; }

Source

Since v2.0.0