sourceFile property Null safety

1. Flutter
2. dart:html
3. SecurityPolicyViolationEvent
4. sourceFile property

SecurityPolicyViolationEvent class

1. Constructors
2. SecurityPolicyViolationEvent
3. Properties
4. blockedUri
5. bubbles
6. cancelable
7. columnNumber
8. composed
9. currentTarget
10. defaultPrevented
11. disposition
12. documentUri
13. effectiveDirective
14. eventPhase
15. hashCode
16. isTrusted
17. lineNumber
18. matchingTarget
19. originalPolicy
20. path
21. referrer
22. runtimeType
23. sample
24. sourceFile
25. statusCode
26. target
27. timeStamp
28. type
29. violatedDirective
30. Methods
31. composedPath
32. noSuchMethod
33. preventDefault
34. stopImmediatePropagation
35. stopPropagation
36. toString
37. Operators
38. operator ==