List the available email themes and layouts:
This hook allows to add/remove available email themes (ThemeInterface) and/or to add/remove their layouts (LayoutInterface)
Hook locations:
Hook type: action
Located in:
dispatchWithParameters(
ThemeCatalogInterface::LIST_MAIL_THEMES_HOOK,
['mailThemes' => $mailThemes]
)
This hook has been implemented as an example in our modules examples repository - example_module_mailtheme.