NormalizerOptions constructor Null safety

1. react_testing_library
2. rtl.dom.queries
3. NormalizerOptions
4. NormalizerOptions constructor

NormalizerOptions class

1. Constructors
2. NormalizerOptions
3. Properties
4. collapseWhitespace
5. hashCode
6. runtimeType
7. trim
8. Methods
9. noSuchMethod
10. toString
11. Operators
12. operator ==