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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.
@MaBe
There is no module for this ic available.
Check this page for existing modules:
http://www.espruino.com/Modules
There are also some gpio extender available which you could use as a good starting point to build a SX1509 module.