Function isNull

isNull(value): value is null
It will determine whether the provided value is null or not.
Parameters
- value: unknown
Returns value is null
Since
1.0.0

Example
```
isNull(null);
// => true
```
Example
```
isNull(undefined);
// => false
```
Example
```
isNull(void 0);
// => false
```
- Defined in is-null.ts:16