externalModuleQualification.ts(3,13): error TS2564: Property 'previousDiffAction' has no initializer and is not definitely assigned in the constructor.


==== externalModuleQualification.ts (1 errors) ====
    export var ID = "test";
    export class DiffEditor<A, B, C> {
        private previousDiffAction: NavigateAction;
                ~~~~~~~~~~~~~~~~~~
!!! error TS2564: Property 'previousDiffAction' has no initializer and is not definitely assigned in the constructor.
        constructor(id: string = ID) {
        }
    }
    class NavigateAction {
        f(editor: DiffEditor<any, any, any>) {
        }
    }
    