The new node "projectdir" when inserted into a flow will add an extra
field msg.projectdir to the incoming msg object and sets its value
to the file system path of the node-red project directory from which this
flow runs.
This is useful for managing file resources for the node-red flow in the same git repository as the node-red flows that use them, e.g. for calling custom shell skripts.
The project directory location is extracted from undocumented fields in the node-red settings. Therefore, this node might stop working later today with the next release of node-red.
Use at your own risk.