1 files changed, 57 insertions, 2 deletions
diff --git a/app/javascript/flavours/glitch/initial_state.js b/app/javascript/flavours/glitch/initial_state.js
index 0f2484ba3..b597ab2c5 100644
--- a/app/javascript/flavours/glitch/initial_state.js
+++ b/app/javascript/flavours/glitch/initial_state.js
@@ -1,4 +1,52 @@
+// @ts-check
+
+/**
+ * @typedef {[code: string, name: string, localName: string]} InitialStateLanguage
+ */
+
+/**
+ * @typedef InitialStateMeta
+ * @property {string} access_token
+ * @property {boolean=} advanced_layout
+ * @property {boolean} auto_play_gif
+ * @property {boolean} activity_api_enabled
+ * @property {string} admin
+ * @property {boolean=} boost_modal
+ * @property {boolean} crop_images
+ * @property {boolean=} delete_modal
+ * @property {boolean=} disable_swiping
+ * @property {boolean} display_media
+ * @property {string} domain
+ * @property {boolean=} expand_spoilers
+ * @property {boolean} limited_federation_mode
+ * @property {string} locale
+ * @property {string | null} mascot
+ * @property {string=} me
+ * @property {boolean} profile_directory
+ * @property {boolean} registrations_open
+ * @property {boolean} reduce_motion
+ * @property {string} repository
+ * @property {boolean} search_enabled
+ * @property {string} source_url
+ * @property {string} streaming_api_base_url
+ * @property {boolean} timeline_preview
+ * @property {string} title
+ * @property {boolean} trends
+ * @property {boolean} unfollow_modal
+ * @property {boolean} use_blurhash
+ * @property {boolean=} use_pending_items
+ * @property {string} version
+ * @property {object} local_settings
+ */
+
+/**
+ * @typedef InitialState
+ * @property {InitialStateLanguage[]} languages
+ * @property {InitialStateMeta} meta
+ */
+
 const element = document.getElementById('initial-state');
+/** @type {InitialState | undefined} */
 const initialState = element && JSON.parse(element.textContent);
 
 // Glitch-soc-specific “local settings”
@@ -8,7 +56,12 @@ try {
   initialState.local_settings = {};
 }
 
-const getMeta = (prop) => initialState && initialState.meta && initialState.meta[prop];
+/**
+ * @template {keyof InitialStateMeta} K
+ * @param {K} prop
+ * @returns {InitialStateMeta[K] | undefined}
+ */
+const getMeta = (prop) => initialState?.meta && initialState.meta[prop];
 
 export const domain = getMeta('domain');
 export const reduceMotion = getMeta('reduce_motion');
@@ -34,7 +87,9 @@ export const usePendingItems = getMeta('use_pending_items');
 export const showTrends = getMeta('trends');
 export const title = getMeta('title');
 export const disableSwiping = getMeta('disable_swiping');
-export const languages = initialState && initialState.languages;
+export const timelinePreview = getMeta('timeline_preview');
+export const activityApiEnabled = getMeta('activity_api_enabled');
+export const languages = initialState?.languages;
 
 // Glitch-soc-specific settings
 export const favouriteModal = getMeta('favourite_modal');