* Introduce scope tracking
* Fix tests
* Add new tests
* Remove constructor-super check from transform as it is now in parser
* Correctly handle class properties and class scope
* Fix duplicate name check
* Convert scope identifier storage to array
* Enter a new scope in typescript module blocks
* Add test for duplicate declaration
* Rename error for duplicate exports
* Treat class declarations as lexical declaration
* Update whitelist
* Add tests
* Fix scope tracking for function declarations
* Migrate try-catch duplicate error
* Fix test
* More tests
* One more test
* Make scope a separate class and fix review comments
* Do not allow new.target in top scope arrow function
* Correctly enter new scope for declare module and treat type aliases as lexical declarations
* Tests for typescript scope tracking to not mark type aliases as duplicate
* Fix flow scope tracking
* Remove ident from test names as redundant
* Add test case for var and function
* Improve error messages
* Improve literal regex
