instanceThemes[instanceName] || DEFAULT_THEME
      })
    },
    store: () => store,
    data: () => ({
      themes,
      DEFAULT_THEME,
      selectedTheme: DEFAULT_THEME
    }),
    computed: {
      themeGroups: ({ themes }) => ([
        {
          dark: false,
          themes: themes.filter(_ => !_.dark)
        },
        {
          dark: true,
          themes: themes.filter(_ => _.dark)
        }
      ])
    },
    helpers: {
      createThemeLabel (theme) {
        return formatIntl('intl.th