Function isNullish

isNullish(value: unknown): value is null | undefined
Returns true if value is null or undefined.
Parameters
- value: unknown
  The value to check.
Returns value is null | undefined
Example
```
isNullish(null)      // => true
isNullish(undefined) // => true
isNullish(0)         // => false
```
- Defined in guards/isNullish/index.ts:13