minimal pedometer widget based on `Bangle.getHealthStatus("day").steps`

Error: Error: Function or String not supplied!

It happens when setInterval/timeout/watch is called with a first argument that's not a function or a string.

It's hard to believe that setTimeout(() => Bangle.drawWidgets(), 10); is what is causing it. You could add some logging statements to try and see - could there be anything else?