module MsPortal.Controls.Base.ItemList {

    export interface Interface<TValue> {
        // Removing this line fixes the constructor of ItemValue
        options: ViewModel<TValue>;
    }    

    export class ItemValue<T> {
        constructor(value: T) {
        }
    }    
 
    export class ViewModel<TValue> extends ItemValue<TValue> {
    }
}

// Generates:
/*
declare module MsPortal.Controls.Base.ItemList {
    interface Interface<TValue> {
        options: ViewModel<TValue>;
    }
    class ItemValue<T> {
        constructor(value: T);
    }
    class ViewModel<TValue> extends ItemValue<TValue> {
    }
}
*/