Function isSome

isSome<T>(option: OptionType<T>): option is Some<T>
Type guard for the Some case.
Type Parameters
- T
Parameters
- option: OptionType<T>
Returns option is Some<T>
Example
```
const maybeUser = fromNullable(lookup(id))
  if (isSome(maybeUser)) render(maybeUser.value)
```
- Defined in option/unwrap.ts:10