Function flatMap

flatMap<T, E, U, F>(
ra: ResultAsyncType<T, E>,
fn: (value: T) => ResultAsyncType<U, F>,
): ResultAsyncType<U, E | F>
Chain a ResultAsync-producing step. If the input resolves to err, fn is skipped; otherwise fn runs and its result becomes the output. Error channels are unioned.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- E
- U
- F
Parameters
- ra: ResultAsyncType<T, E>
- fn: (value: T) => ResultAsyncType<U, F>
Returns ResultAsyncType<U, E | F>
Example
```
pipe(
    fetchUser(userId),
    ResultAsync.flatMap(user => fetchOrders(user.id)),
    ResultAsync.flatMap(orders => chargeBatch(orders)),
  )
```
- Defined in result-async/transform.ts:91
flatMap<T, U, F>(
fn: (value: T) => ResultAsyncType<U, F>,
): <E>(ra: ResultAsyncType<T, E>) => ResultAsyncType<U, F | E>
Chain a ResultAsync-producing step. If the input resolves to err, fn is skipped; otherwise fn runs and its result becomes the output. Error channels are unioned.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- U
- F
Parameters
- fn: (value: T) => ResultAsyncType<U, F>
Returns <E>(ra: ResultAsyncType<T, E>) => ResultAsyncType<U, F | E>
Example
```
pipe(
    fetchUser(userId),
    ResultAsync.flatMap(user => fetchOrders(user.id)),
    ResultAsync.flatMap(orders => chargeBatch(orders)),
  )
```
- Defined in result-async/transform.ts:95