Not working on node 14

I am able to run a simple flow "Select 1" on node 12, but if i run node red in a node 14 the module does not return any data or errors. 
I think i have tracked it down to line 66, let client = yield pgPool.connect()
I have pool connect running ok in other node 14 apps, I think it might be something to do with the co( and yield
But I am not familiar with co enough to suggest a solution