Data exchange between a widget and a clock face

Some code for an example. If you define your widget as

WIDGETS.mywidget = {
    area: ...,
    draw: ...,
    width: ...,
    someVariable: 123,
    someFunction: () => { ... },
  };

Then in your clock, after calling Bangle.loadWidgets(), you can use WIDGETS.mywidget.someVariable and WIDGETS.mywidget.someFunction().