function isNullOrUndefined
isNullOrUndefined(object: unknown): object is null | undefinedDeprecated
Returns true if the given object is null or undefined. Otherwise,
returns false.
import util from 'node:util';
util.isNullOrUndefined(0);
// Returns: false
util.isNullOrUndefined(undefined);
// Returns: true
util.isNullOrUndefined(null);
// Returns: true
object is null | undefined