I believe Azure ARM does support Azure Functions because obviously this GitHub project https://github.com/sedouard/azure-functions-node is calling ARM to create/get/list/delete Azure Functions. But I couldn't find anything about Azure Functions on Azure REST API Reference (https://docs.microsoft.com/en-us/rest/api/).
Is it an officially supported feature in ARM to manipulate Azure Functions? Where can I find the complete (and up-to-date) documentation of Azure ARM REST API for Azure Functions?