Function isNullish

isNullish(input?): input is Nullish
Check if input is undefined or null.

Example
```
isNullish(undefined); // true
isNullish(null); // true
isNullish(""); // false
isNullish(42); // false
```
Parameters
- input: unknown = null
Returns input is Nullish
true if nullish, false otherwise.
- Defined in work/predicates/predicates/src/isNullish.ts:17