Question about versions

Is there any reason to lock the `babel-source` version to `>= 4`

Why not to upgrade it to `5`? Or we can bump a new version of `babel-transpiler` to depends on version `>=5`.

:rocket: :rocket: :rocket:

The issue names the babel-source dependency and babel-transpiler, but no files or tests. Start by locating the dependency declaration and checking the project's compatibility requirements for versions 5 and newer. Done means deciding whether the dependency can be upgraded and documenting or implementing the agreed version change.

Written by the indexing model from the issue text.