How to use the superdesk-core/scripts/core/services/ng.waitForServicesToBeAvailable function in superdesk-core

($injector, sdPlanningStore, extensionPoints, functionPoints, assignments, deployConfig) => {
            ng.register($injector);

            const callback = (extension, scope) => (
                sdPlanningStore.initWorkspace(WORKSPACE.AUTHORING, (store) => {
                    store.dispatch(actions.fetchAgendas());
                    extension.props.store = store;
                    scope.$watch('selected.preview', (newValue) => {
                        extension.props.store.dispatch(actions.main.onQueueItemChange(newValue));
                    });
                })
            );

            ng.waitForServicesToBeAvailable()
                .then(() => {
                    extensionPoints.register('publish_queue:preview',
                        PublishQueuePanel, {}, ['selected'],
                        callback);
                });

            deployConfig.promise.then(() => {
                if (get(deployConfig, 'config.planning_check_for_assignment_on_publish', false)) {
                    functionPoints.register(
                        'authoring:publish',
                        assignments.onPublishFromAuthoring
                    );
                }
            });
        },
    ]);