rn-app/ios/app/Images.xcassets/AppIcon.appiconset/Contents.json

{
  "images" : [
    {
      "idiom" : "iphone",
      "scale" : "2x",
      "size" : "20x20"
    },
    {
      "idiom" : "iphone",
      "scale" : "3x",
      "size" : "20x20"
    },
    {
      "idiom" : "iphone",
      "scale" : "2x",
      "size" : "29x29"
    },
    {
      "idiom" : "iphone",
      "scale" : "3x",
      "size" : "29x29"
    },
    {
      "idiom" : "iphone",
      "scale" : "2x",
      "size" : "40x40"
    },
    {
      "idiom" : "iphone",
      "scale" : "3x",
      "size" : "40x40"
    },
    {
      "idiom" : "iphone",
      "scale" : "2x",
      "size" : "60x60"
    },
    {
      "idiom" : "iphone",
      "scale" : "3x",
      "size" : "60x60"
    },
    {
      "idiom" : "ios-marketing",
      "scale" : "1x",
      "size" : "1024x1024"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}