We have app build in React Native and Cordova writen in TypeScript. We use a IDE for this language and would also like to write all our tests in the same language. Appium supports javascript for writing tests, but App Center does not.
We would really like to see javascript or even typescript supported so we don't need to write all our appium tests in java. It will greatly improve our productivity, ease of use and remove our need to use another IDE to write and run the tests. We use Webstorm and similar tools now.