1. Dart
2. dart:core
3. ArgumentError
4. checkNotNull method

ArgumentError class

1. Constructors
2. ArgumentError
3. notNull
4. value
5. Properties
6. invalidValue
7. message
8. name
9. hashCode
10. runtimeType
11. stackTrace
12. Methods
13. toString
14. noSuchMethod
15. Operators
16. operator ==
17. Static methods
18. checkNotNull

@Since("2.1")
static void checkNotNull(Object argument, [String name]) {
  if (argument == null) throw ArgumentError.notNull(name);
}