v3: src/ is documented like api/ and shared/, and the reference covers the whole repository — the frontend had no module docs, JSDoc on some components and hooks and not on others, props typed inline in half the components and in private interfaces in the rest, // comments on declarations, and no return types on 147 exported functions, so deno doc --lint over src/ found 637 errors. The rule api/ follows is applied to every non-test module of src/: a /** … @module */ block, JSDoc on every export and every field of an exported interface, /** */ for declarations and // for notes, verbs for functions ("Renders…" for a component), parameters named in the prose, {@link} only for symbols in scope, and a page's JSDoc names its route and who may see it (App.tsx's module doc lists the route table). For deno doc to show them, every exported function states its return type: components React.JSX.Element (or | null, or a portal), memo and forwardRef components their exotic types, contexts React.Context<…>, and a hook returning several things a documented Use<Name>Result interface (useAuth, useRequiredAuth, useFading, useEmojiTrigger, useMentionAutocomplete, useDumpCardLink, usePlayRichContent; FeedCacheResult, YouTubePlaylistControls and UseApiFormReturn are renamed to match). Every component that takes props takes an exported, documented <Name>Props interface — the 64 inline prop types are lifted into one, DumpFeed gets DumpFeedProps extending MainFeedProps. React types go through the global React namespace: the four default imports of react are gone, since deno doc can't follow them. Two duplicates go too: useMentionAutocomplete's UserResult was shared/'s UserSuggestion, and JournalCard re-exported JournalShape for no one; i18n.ts no longer re-exports Lingui's i18n, which its three users now import from @lingui/core. deno task doc and doc:lint now take src/ (but its tests and the generated locales), the index page gains a Frontend section linking every module by layer and domain, mod.test.ts walks src/ as well, and the docs workflow runs on changes to src/. deno doc doesn't document npm packages, so it takes a type imported from one — react-hook-form's FieldValues in the form fields, frimousse's SkinTone — for a private one; doc:lint now goes through doc-lint.ts, which fails on every diagnostic but those, 25 of them. The README states the frontend's part of the rule. No behaviour changes; 205 backend and 628 frontend tests pass, and tsc, deno check and deno lint are clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/shared/TabBar.tsx

@@ -1,25 +1,46 @@
+/**
+ * A row of tabs.
+ *
+ * @module
+ */
+
 import { type ReactNode, useLayoutEffect, useRef, useState } from "react";
 
-interface Tab<T extends string> {
+/** A tab. */
+export interface Tab<T extends string> {
+  /** What {@link TabBar} reports when it is chosen. */
   key: T;
+  /** What it shows. */
   label: ReactNode;
 }
 
-interface TabBarProps<T extends string> {
+/** The props of {@link TabBar}. */
+export interface TabBarProps<T extends string> {
+  /** The tabs, in order. */
   tabs: Tab<T>[];
+  /** The active tab's key. */
   activeTab: T;
+  /** Called with the key of the tab chosen. */
   onChange: (key: T) => void;
+  /** An extra class for the scroller. */
   className?: string;
+  /** An extra class for the row. */
   innerClassName?: string;
-  // Optional content rendered inside the row, before the tabs (e.g. a scope
-  // selector). Sits in the same flex line so it scrolls and aligns with them.
+  /**
+   * Optional content rendered inside the row, before the tabs (e.g. a scope
+   * selector). Sits in the same flex line so it scrolls and aligns with them.
+   */
   leading?: ReactNode;
 }
 
+/**
+ * Renders a row of tabs that scrolls when they don't all fit, keeping the
+ * active one in view.
+ */
 export function TabBar<T extends string>(
   { tabs, activeTab, onChange, className, innerClassName, leading }:
     TabBarProps<T>,
-) {
+): React.JSX.Element {
   const rowRef = useRef<HTMLDivElement>(null);
   const [overflowing, setOverflowing] = useState(false);