mastodon-docker-playground/app/javascript/flavours/vanilla/theme.yml

#  (REQUIRED) The location of the pack files inside `pack_directory`.
pack:
  about: about.js
  admin: public.js
  auth:
  common:
    filename: common.js
    stylesheet: true
  embed: public.js
  error:
  home:
    filename: application.js
    preload:
    - features/getting_started
    - features/compose
    - features/home_timeline
    - features/notifications
  mailer:
  modal:
  public: public.js
  settings: public.js
  share: share.js

#  (OPTIONAL) The directory which contains localization files for
#  the flavour, relative to this directory.
locales: ../../mastodon/locales

#  (OPTIONAL) A file to use as the preview screenshot for the flavour,
#  or an array thereof. These filenames must be unique across all
#  images (regardless of path), so it's a good idea to namespace them
#  to your theme. It's up to you to let webpack know to compile them.
screenshot: screenshot.jpg

#  (OPTIONAL) The directory which contains the pack files.
#  Defaults to this directory (`app/javascript/flavour/[flavour]`),
#  but in the case of the vanilla Mastodon flavour the pack files are
#  somewhere else.
pack_directory: app/javascript/packs

#  (OPTIONAL) By default the theme will fallback to the default flavour
#  if a particular pack is not provided. You can specify different
#  fallbacks here, or disable fallback behaviours altogether by
#  specifying a `null` value.
fallback: