* test: add test for nullish coalescing Co-Authored-By: Nicolò Ribaudo <nicolo.ribaudo@gmail.com> * test: add control group * test: add tests for optional chaining Co-Authored-By: Nicolò Ribaudo <nicolo.ribaudo@gmail.com> * test: add tests on optional chaining mixed with private class elements * fix: wrap member chains to IIFE when it is in parameter default * chore: add more testcases * chore: update test fixtures * fix: NodePath.get is always non nullish Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>