Web have a node application written in ES6/babel which cannot (yet) be run by the latest stable node engine.
Locally we use babel-node
to run the application using babel's on-the-fly transpiler;
However this is strongly discourages on the production environment (due to memory and performance footprints).
So we would need to transpile our application to the stable ECMA and deploy the artefacts to Azure -- instead of the original app.