Function mapErr

mapErr<T, E = Error, F = Error>(
result: Result<T, E>,
fn: (err: E) => F,
): Result<T, F>
Maps an error Result using the provided function. If the Result is successful, returns the success unchanged.
Type Parameters
- T
  The type of the successful value
- E = Error
  The type of the input error
- F = Error
  The type of the output error
Parameters
- result: Result<T, E>
  The Result to map the error of
- fn: (err: E) => F
  Function to transform the error
Returns Result<T, F>
A new Result with the transformed error, or the original success
Example
```
const errorResult = err(new Error("Network error"))
const enhancedError = mapErr(errorResult, err =>
  new Error(`API call failed: ${err.message}`)
) // err(Error("API call failed: Network error"))
```
- Defined in index.ts:208