From past experience, their support is good, but one significant thing I missed was type inference: // function signature getNumber(context: any, callb

From past experience, their support is good, but one significant thing I missed was type inference: // function signature getNumber(context: any, callback: (result: Number) => void); // calling that function // unfortunately, here the type of num is any // unless I specify it manually getNumber(..., (num) => { ... }); Visual Studio figured out the type on its own.