fbmobile/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

{
    "images": [
        {
            "idiom": "universal",
            "filename": "LaunchImage.png",
            "scale": "1x"
        },
        {
            "idiom": "universal",
            "filename": "LaunchImage@2x.png",
            "scale": "2x"
        },
        {
            "idiom": "universal",
            "filename": "LaunchImage@3x.png",
            "scale": "3x"
        }
    ],
    "info": {
        "version": 1,
        "author": "xcode"
    }
}