class SampleDo3 {
    // class variables
    private do;
}

// class properties
class SampleDo4 {
    private var;
    set do(value) {}
    get do() {
        return this.var;
    }
}

class SampleDo5 {
    do() {} // class methods
}

// interface declarations
interface SampleDo6 {
    do: any;
}