Function isNullOrUndefined

isNullOrUndefined(value: unknown): value is undefined | null
Check if a value is null or undefined.
Parameters
- value: unknown
  The value to check
Returns value is undefined | null
Example
```
import { isNullOrUndefined } from '@aws-lambda-powertools/commons/typeUtils';

const value = null;
if (isNullOrUndefined(value)) {
  // value is null or undefined
}
```
- Defined in typeUtils.ts:153