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/playlist/PlaylistCard.tsx

@@ -1,3 +1,9 @@
+/**
+ * A playlist, as a card in a list.
+ *
+ * @module
+ */
+
 import { Link, useNavigate } from "react-router";
 import { t } from "@lingui/core/macro";
 import { Plural, Trans } from "@lingui/react/macro";
@@ -12,15 +18,24 @@ import {
 } from "../../utils/shared/visited.ts";
 import { Tooltip } from "../shared/Tooltip.tsx";
 
-interface PlaylistCardProps {
+/** The props of {@link PlaylistCard}. */
+export interface PlaylistCardProps {
+  /** The playlist. */
   playlist: Playlist;
+  /** Deletes it; no delete button without it. */
   onDelete?: () => void;
+  /** Whether the viewer owns it: no owner link, no unread dot. */
   isOwner?: boolean;
 }
 
+/**
+ * Renders a playlist as a card: its cover, title, description, visibility,
+ * owner, size and age, with an unread dot until it is opened. The card opens
+ * the playlist.
+ */
 export function PlaylistCard(
   { playlist, onDelete, isOwner }: PlaylistCardProps,
-) {
+): React.JSX.Element {
   const navigate = useNavigate();
   const { mediaToken } = useAuth();
   const unread = !isOwner && isRecent(playlist.createdAt) &&