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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I will cut to the chase and suppose that a good end position is to have all ESP targets on one version of the ESP-IDF and that all build variances of the targets configured within the ESP-IDF sdkConfig (The SDK project configuration) mechanism.
(I suppose this may be obvious ... but worth stateing :)
With a common code base for all ESP targets (eg jshardwareESP.c ) using minimal #idfefs. And implementing a method in the boards.py file to specify the config file to be used in the IDF.py build.