How to use the ghost/views/settings/content-base.extend function in ghost

import BaseView from 'ghost/views/settings/content-base';

var SettingsNavigationView = BaseView.extend({

    didInsertElement: function () {
        var controller = this.get('controller'),
            navContainer = Ember.$('.js-settings-navigation'),
            navElements = '.navigation-item:not(.navigation-item:last-child)';

        navContainer.sortable({
            handle: '.navigation-item-drag-handle',
            items: navElements,

            update: function () {
                var indexes = [];
                navContainer.find(navElements).each(function () {
                    var order = Ember.$(this).data('order');
                    indexes.push(order);
                });

import BaseView from 'ghost/views/settings/content-base';

var SettingsAboutView = BaseView.extend();

export default SettingsAboutView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsLabsView = BaseView.extend();

export default SettingsLabsView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsUsersView = BaseView.extend();

export default SettingsUsersView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsGeneralView = BaseView.extend();

export default SettingsGeneralView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsGeneralView = BaseView.extend();

export default SettingsGeneralView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsLabsView = BaseView.extend();

export default SettingsLabsView;

import BaseView from 'ghost/views/settings/content-base';
import PaginationScrollMixin from 'ghost/mixins/pagination-view-infinite-scroll';

var SettingsTagsView = BaseView.extend(PaginationScrollMixin);

export default SettingsTagsView;

import BaseView from 'ghost/views/settings/content-base';

var SettingsAboutView = BaseView.extend();

export default SettingsAboutView;

import BaseView from 'ghost/views/settings/content-base';
import PaginationScrollMixin from 'ghost/mixins/pagination-view-infinite-scroll';

var SettingsTagsView = BaseView.extend(PaginationScrollMixin);

export default SettingsTagsView;