playScreenshotTypes top-level constant
Screenshot directories Play understands, by the name it uses.
Listed rather than derived for the same reason as the App Store side: these are directory names, so an unrecognised one is a typo that would otherwise publish nowhere silently.
Implementation
const playScreenshotTypes = <String>{
'phoneScreenshots',
'sevenInchScreenshots',
'tenInchScreenshots',
'tvScreenshots',
'wearScreenshots',
};