Add preliminary settings schema

app/soapbox/locales/messages.ts

@@ -26,7 +26,7 @@ const importMessagesWithCustom = (locale: string): Promise<MessageJson> => {
   });
 };
 
-const locales: string[] = [
+const locales = [
   'ar',
   'ast',
   'bg',
@@ -91,7 +91,7 @@ const locales: string[] = [
   'zh-CN',
   'zh-HK',
   'zh-TW',
-];
+] as const;
 
 /** Soapbox locales map */
 const messages = locales.reduce((acc, locale) => {
@@ -100,3 +100,4 @@ const messages = locales.reduce((acc, locale) => {
 }, {} as Record<string, () => Promise<MessageJson>>);
 
 export default messages;
+export { locales };

app/soapbox/schemas/soapbox/settings.ts

@@ -0,0 +1,36 @@
+import { z } from 'zod';
+
+import { locales } from 'soapbox/locales/messages';
+
+const skinToneSchema = z.union([
+  z.literal(1), z.literal(2), z.literal(3), z.literal(4), z.literal(5), z.literal(6),
+]);
+
+const settingsSchema = z.object({
+  onboarded: z.boolean().catch(false),
+  skinTone: skinToneSchema.catch(1),
+  reduceMotion: z.boolean().catch(false),
+  underlineLinks: z.boolean().catch(false),
+  autoPlayGif: z.boolean().catch(true),
+  displayMedia: z.enum(['default', 'hide_all', 'show_all']).catch('default'),
+  expandSpoilers: z.boolean().catch(false),
+  unfollowModal: z.boolean().catch(false),
+  boostModal: z.boolean().catch(false),
+  deleteModal: z.boolean().catch(true),
+  missingDescriptionModal: z.boolean().catch(false),
+  defaultPrivacy: z.enum(['public', 'unlisted', 'private', 'direct']).catch('public'),
+  defaultContentType: z.enum(['text/plain', 'text/markdown']).catch('text/plain'),
+  themeMode: z.enum(['system', 'light', 'dark']).catch('system'),
+  locale: z.string().catch(navigator.language).pipe(z.enum(locales)).catch('en'),
+  showExplanationBox: z.boolean().catch(true),
+  explanationBox: z.boolean().catch(true),
+  autoloadTimelines: z.boolean().catch(true),
+  autoloadMore: z.boolean().catch(true),
+  systemFont: z.boolean().catch(false),
+  demetricator: z.boolean().catch(false),
+  isDeveloper: z.boolean().catch(false),
+});
+
+type Settings = z.infer<typeof settingsSchema>;
+
+export { settingsSchema, type Settings };