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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.
@Gordon
The code appears to be in the file
.bootcdenow - this file is not written/updated by Bangle.js apps the only way it really could have got there is if you'd got the Web IDE set to upload to 'flash' rather than your modified HRM app.