Everything sat in the eager startup graph (App.tsx statically imported all 28
routes; the editor pulled TipTap + KaTeX + ~45 lowlight grammars + drawio;
posthog + AI SDK loaded for everyone) — a /login visitor downloaded+compiled the
whole editor. Client-only; functionality 1:1, only WHEN code loads changed.
Result (prod build): eager JS 3.5MB -> ~1.12MB, entry 1920KB -> 552KB; KaTeX
(250KB) and the TipTap engine (~586KB) are now lazy chunks, off the startup path.
- App.tsx: route-level React.lazy + Suspense (editor Page, all settings/*, share,
space/home routes). Auth/redirect/cold-start routes stay eager. Suspense lives
inside Layout/ShareLayout around the Outlet so the shell stays mounted.
- Lazy KaTeX node views (math-inline-lazy/math-block-lazy) + lazy drawio
(drawio-view-lazy/drawio-menu-lazy), mirroring mermaid/excalidraw, each with a
node-sized Suspense placeholder so a slow chunk can't crash the editor.
- posthog-js is now a conditional dynamic import under the unchanged
isCloud() && isPostHogEnabled gate — self-hosted never downloads it.
- AiChatWindow is React.lazy, mounted on first open and kept mounted (a live AI
stream isn't torn down); renders null while closed (identical behavior).
- Cut eager TipTap pulls from always-loaded shell modules: editor-atoms /
global-bridge Editor -> import type; Aside lazily loaded (page routes only);
config.ts sanitizeUrl and use-clipboard execCommandCopy moved to client-local
src/lib/{sanitize-url,copy-to-clipboard}.ts (byte-identical to the editor-ext
originals, dropping the barrel's top-level @tiptap import); WebSocketStatus
import replaced with the "connected" literal the status atom already stores.
- vite.config.ts: a vendor-katex chunk group (TipTap/PM/Yjs intentionally NOT
grouped — grouping dragged the engine eager; documented in the config).
- lowlight grammar registration is left inside the (now-lazy) editor chunk:
listLanguages()/highlighting are synchronous, so deferring registration would
change behavior for marginal in-chunk gain — the route split already removes it
from startup, which was the complaint.
Gate: client build succeeds, tsc --noEmit clean, frozen install EXIT 0 (added
@braintree/sanitize-url as a direct client dep + regenerated the lock).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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