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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.
@opichals
An Arrow function is different from a normal one in that its context is not bound and is taken from the scope lexically above it. Here is an article explaining the differences.
The code looks as correct ES6 wrt to context use and it should work (I had to fix class inheritance and undeclared variable use in order to run it in Chrome). It looks like an Espruino bug.