Non-consistent behavior between insert("after", ...) and insertAfter(...)

[lm-sousa]

When calling insert and insertAfter different behaviour is exhibited.
Below is a JS translation of the CxxTest.testNoParsing test. The version on the left (insert("after", ...)) passes the test. The one on the right (insertAfter(...)) doesn't.
Below is also a comparison between the original LARA code and the JS translation.

Additionally the following warning is shown when executing the insertAfter(...) version:

Can only insert Decl nodes in a file, tried to insert a 'statement'

[lm-sousa]

The same also occurs in CxxTest.testFileRebuild