mastodon-ios/Mastodon/Resources/Assets.xcassets/Settings/dark.auto.imageset/Contents.json

{
  "images" : [
    {
      "filename" : "Mixed_Dark_Light.png",
      "idiom" : "universal"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}