Function isNone

isNone<T>(opt: Option.Option<T>): opt is None
Checks whether opt is None.
Type Parameters
- T
Parameters
- opt: Option.Option<T>
  The optional value.
Returns opt is None
The proof that opt is a None.

Examples
Example
```
expect(isNone(some(2))).toStrictEqual(false);
expect(isNone(none())).toStrictEqual(true);
```
- Defined in src/option.ts:138