Function mapError

mapError<T, E, F>(
ra: ResultAsyncType<T, E>,
fn: (error: E) => F | Promise<F>,
): ResultAsyncType<T, F>
Transform the error channel of a ResultAsync. fn may return a value or a Promise. Success values pass through untouched.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- E
- F
Parameters
- ra: ResultAsyncType<T, E>
- fn: (error: E) => F | Promise<F>
Returns ResultAsyncType<T, F>
Example
```
pipe(
    fetchUser(id),
    ResultAsync.mapError(cause => ({ code: "USER_LOAD_FAILED", cause })),
  )
```
- Defined in result-async/transform.ts:58
mapError<E, F>(
fn: (error: E) => F | Promise<F>,
): <T>(ra: ResultAsyncType<T, E>) => ResultAsyncType<T, F>
Transform the error channel of a ResultAsync. fn may return a value or a Promise. Success values pass through untouched.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- E
- F
Parameters
- fn: (error: E) => F | Promise<F>
Returns <T>(ra: ResultAsyncType<T, E>) => ResultAsyncType<T, F>
Example
```
pipe(
    fetchUser(id),
    ResultAsync.mapError(cause => ({ code: "USER_LOAD_FAILED", cause })),
  )
```
- Defined in result-async/transform.ts:62