Function isNullish

isNullish(value: unknown): value is Nullish
Checks whether a value is nullish, narrowing it to Nullish.
Parameters
- value: unknown
  The value to check.
Returns value is Nullish
true if nullish.
Example
```
isNullish(null);      // true
isNullish(undefined); // true
isNullish(0);         // false
```
- Defined in type/nullable.ts:24