where do I find theme settings?

I know that I can find the current general settings using

  let Settings = require('Storage').readJSON('setting.json', true) || {};
  print('Settings',Settings);

but where do I find details of the currently configured theme?

The documentation tells us to look into a file called settings.js which sounds strange on one hand and does not exist on the other...

I guess that refers to the file on Github. Take a look at https://github.com/espruino/BangleApps/blob/d9d5926416566762e59b953c745f989d23c9b334/apps/setting/settings.js#L214

For the currently used theme just use g.theme. That will spit out a JSON array.

Thanks for your response.

What I am currently looking for is a place where a global theming could be defined.

Right now, everything seems to render black on white - but what if I would like to have it the other way round (white on black)? Where could I configure such a theme?

While global settings may not include an explicit configuration for a global theme, you may still set one which is from then on respected in any apps (unless they override any theme settings):

  let customTheme = {
    fg:g.toColor(0,0,0), fg2:g.toColor(0,0,1), fgH:g.toColor(0,0,0),
    bg:g.toColor(0,1,0), bg2:g.toColor(0,1,0), bgH:g.toColor(1,1,0)
  };
  let globalSettings = Object.assign(
    require('Storage').readJSON('setting.json', true) || {},
    { theme:customTheme }
  );
  require('Storage').writeJSON('setting.json', globalSettings);

It is important, however, that you use g.toColor in order to get the proper color values for the Bangle.js 2!

g.theme holds the value of the apps active theme.

I know, but I want to set a theme globally!

To set it globally go into the settings App, under System, select Theme.

There are 2 themes defined, a black on white and a white on black.
You can them customise the actual settings on one of more of the attribute.
In that way you can define you own theme.

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Great! thank you!