One React renderer, three runtime edges

import React from "react";
import ReactDOM from "react-dom/client";
import { ClerkProvider } from "@clerk/react";
import { passkeys } from "@clerk/electron/passkeys";
import { ClerkProvider as ElectronClerkProvider } from "@clerk/electron/react";
import { createHashHistory, createBrowserHistory } from "@tanstack/react-router";
 
import "./index.css";
 
import { isElectron } from "./env";
import { ManagedRelayAuthProvider } from "./cloud/managedAuth";
import { hasCloudPublicConfig } from "./cloud/publicConfig";
import { getRouter } from "./router";
import {
  syncDocumentElectronPlatformClasses,
  syncDocumentWindowControlsOverlayClass,
} from "./lib/windowControlsOverlay";
import { AppRoot } from "./AppRoot";
import { clerkAppearance } from "./components/clerk/clerkAppearance";
 
// Electron loads the app from a file-backed shell, so hash history avoids path resolution issues.
const history = isElectron ? createHashHistory() : createBrowserHistory();
 
const router = getRouter(history);
 
if (isElectron) {
  syncDocumentElectronPlatformClasses(navigator.platform);
  syncDocumentWindowControlsOverlayClass();
}
 
const clerkPublishableKey = import.meta.env.VITE_CLERK_PUBLISHABLE_KEY as string | undefined;
 
// First Clerk UI build containing https://github.com/clerk/javascript/pull/9500.
const electronClerkUI = {
  __internal_clerkUIVersion: "1.30.5-canary.v20260819050620",
};
 
const app = <AppRoot router={router} />;
 
ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
  <React.StrictMode>
    {clerkPublishableKey && hasCloudPublicConfig() ? (
      isElectron ? (
        <ElectronClerkProvider
          {...electronClerkUI}
          appearance={clerkAppearance}
          publishableKey={clerkPublishableKey}
          passkeys={passkeys}
        >
          <ManagedRelayAuthProvider>{app}</ManagedRelayAuthProvider>
        </ElectronClerkProvider>
      ) : (
        <ClerkProvider appearance={clerkAppearance} publishableKey={clerkPublishableKey}>
          <ManagedRelayAuthProvider>{app}</ManagedRelayAuthProvider>
        </ClerkProvider>
      )
    ) : (
      app
    )}
  </React.StrictMode>,
);

import { RouterProvider } from "@tanstack/react-router";
 
import { ElectronBrowserHost } from "./browser/ElectronBrowserHost";
import { PreviewAutomationHosts } from "./components/preview/PreviewAutomationHosts";
import { QuitHoldOverlay } from "./components/QuitHoldOverlay";
import { AppAtomRegistryProvider } from "./rpc/atomRegistry";
import type { AppRouter } from "./router";
 
/**
 * Owns renderer-wide providers. The Electron browser host intentionally sits
 * outside the router so its webviews survive route transitions, but it must
 * share the same atom registry as routed UI.
 */
export function AppRoot({ router }: { readonly router: AppRouter }) {
  return (
    <AppAtomRegistryProvider>
      <RouterProvider router={router} />
      <PreviewAutomationHosts />
      <ElectronBrowserHost />
      <QuitHoldOverlay />
    </AppAtomRegistryProvider>
  );
}

import { createRouter, RouterHistory } from "@tanstack/react-router";
 
import { routeTree } from "./routeTree.gen";
 
export function getRouter(history: RouterHistory) {
  return createRouter({
    routeTree,
    history,
    context: {},
  });
}
 
export type AppRouter = ReturnType<typeof getRouter>;
 
declare module "@tanstack/react-router" {
  interface Register {
    router: AppRouter;
  }
}

import { createEnvironmentCatalogAtoms } from "@t3tools/client-runtime/state/connections";
 
import { connectionAtomRuntime } from "./runtime";
 
export const environmentCatalog = createEnvironmentCatalogAtoms(connectionAtomRuntime);

import { connectionAtomRuntime } from "../connection/runtime";
import { appAtomRegistry } from "../rpc/atomRegistry";
 
export const environmentSession = createEnvironmentSessionAtoms(connectionAtomRuntime);
 
const EMPTY_PREPARED_CONNECTION_ATOM = Atom.make(Option.none()).pipe(
  Atom.withLabel("web-prepared-connection:empty"),
);
 
export function usePreparedConnection(environmentId: EnvironmentId | null) {
  return useAtomValue(
    environmentId === null
      ? EMPTY_PREPARED_CONNECTION_ATOM
      : environmentSession.preparedConnectionValueAtom(environmentId),
  );
}
 
export function readPreparedConnection(environmentId: EnvironmentId) {
  return Option.getOrNull(
    appAtomRegistry.get(environmentSession.preparedConnectionValueAtom(environmentId)),
  );
}
 
/**
 * This client's authenticated session on one environment, as reported by that
 * environment's `/api/auth/session` endpoint. `data` stays populated across
 * SWR revalidations; `isPending` is only meaningful before the first resolve.
 */
export function useEnvironmentSessionState(environmentId: EnvironmentId) {
  const result = useAtomValue(environmentSession.sessionStateAtom(environmentId));
  return {
    data: Option.getOrNull(AsyncResult.value(result)),
    hasError: result._tag === "Failure",
    isPending: result.waiting,
  };

  if (rows.length === 0 && !isWorking) {
    if (hideEmptyPlaceholder) {
      return null;
    }
    return (
      <div className="flex h-full items-center justify-center">
        <p className="text-placeholder text-sm">Send a message to start the conversation.</p>
      </div>
    );
  }
 
  return (
    <TimelineRowCtx value={sharedState}>
      <TimelineRowActivityCtx value={activityState}>
        <div ref={setTimelineViewportElement} className="relative h-full min-h-0">
          <LegendList<MessagesTimelineRow>
            ref={listRef}
            data={rows}
            keyExtractor={keyExtractor}
            getItemType={getItemType}
            renderItem={renderItem}
            estimatedItemSize={90}
            initialScrollAtEnd
            {...(anchoredEndSpace ? { anchoredEndSpace } : {})}
            contentInsetEndAdjustment={contentInsetEndAdjustment}
            maintainScrollAtEnd={
              anchoredEndSpace || !liveFollowEnabled || disclosureToggleSettling
                ? false
                : TIMELINE_MAINTAIN_SCROLL_AT_END
            }
            maintainVisibleContentPosition={maintainVisibleContentPosition}
            onScroll={handleScroll}
            className={cn(
              "scrollbar-gutter-both h-full min-h-0 overflow-x-hidden overscroll-y-contain px-3 [overflow-anchor:none] sm:px-5",
              topFadeEnabled && "topbar-scroll-fade",
            )}
            ListHeaderComponent={
              loadEarlier !== null ? (
                <TimelineLoadEarlierHeader
                  loading={loadEarlier.loading}
                  onLoadEarlier={loadEarlier.onLoadEarlier}
                  fade={topFadeEnabled}
                />
              ) : topFadeEnabled ? (
                TIMELINE_LIST_FADE_HEADER
              ) : (
                TIMELINE_LIST_HEADER
              )
            }
            ListFooterComponent={TIMELINE_LIST_FOOTER}
          />
          <TimelineMinimap
            items={minimapItems}
            hasPersistentGutter={minimapHasPersistentGutter}
            hitStripWidth={minimapHitStripWidth}
            stripMap={minimapStripMap}
            onSelect={(item) => {
              onManualNavigation();
              void listRef.current?.scrollToIndex({
                index: item.rowIndex,
                animated: true,
                viewOffset: 24,
              });
            }}
          />
        </div>
      </TimelineRowActivityCtx>
    </TimelineRowCtx>
  );
});
 
function keyExtractor(item: MessagesTimelineRow) {
  return item.id;
}
 
function getItemType(item: MessagesTimelineRow) {
  return item.kind === "message" ? `message:${item.message.role}` : item.kind;
}

// so LegendList (and React) can skip re-rendering unchanged items.
// ---------------------------------------------------------------------------
 
/** Returns a structurally-shared copy of `rows`: for each row whose content
 *  hasn't changed since last call, the previous object reference is reused. */
function useStableRows(rows: MessagesTimelineRow[]): MessagesTimelineRow[] {
  const prevState = useRef<StableMessagesTimelineRowsState>({
    byId: new Map<string, MessagesTimelineRow>(),
    result: [],
  });
 
  return useMemo(() => {
    const nextState = computeStableMessagesTimelineRows(rows, prevState.current);
    prevState.current = nextState;
    return nextState.result;
  }, [rows]);
}
 
// ---------------------------------------------------------------------------

    SNOOZED_SHELF_EXPANDED_KEY,
    false,
    Schema.Boolean,
  );
  const toggleSnoozedShelf = useCallback(
    () => setSnoozedShelfExpanded((value) => !value),
    [setSnoozedShelfExpanded],
  );
  const visibleSnoozedThreads = useMemo(() => {
    if (snoozedShelfExpanded) return snoozedThreads;
    // The open thread must never vanish behind the collapsed shelf: a
    // snoozed thread reached by route (deep link, open before snoozing
    // elsewhere) keeps its row — with highlight and wake affordance — same
    // exception the settled tail's "Show more" makes.
    if (routeThreadKey === null) return [];
    const routeThread = snoozedThreads.find(
      (thread) =>
        scopedThreadKey(scopeThreadRef(thread.environmentId, thread.id)) === routeThreadKey,
    );
    return routeThread === undefined ? [] : [routeThread];
  }, [routeThreadKey, snoozedShelfExpanded, snoozedThreads]);
 
  const orderedThreads = useMemo(
    () => [...pinnedThreads, ...activeThreads, ...visibleSnoozedThreads, ...renderedSettledThreads],
    [pinnedThreads, activeThreads, visibleSnoozedThreads, renderedSettledThreads],
  );
  const orderedThreadKeys = useMemo(
    () =>
      orderedThreads.map((thread) =>
        scopedThreadKey(scopeThreadRef(thread.environmentId, thread.id)),
      ),
    [orderedThreads],
  );
  // Rows call back into the click handler without carrying the ordered list as
  // a prop — a fresh array identity per shell update would defeat every row's
  // memoization. The ref keeps shift-range-select working against the list as
  // rendered at click time.
  const orderedThreadKeysRef = useRef(orderedThreadKeys);
  orderedThreadKeysRef.current = orderedThreadKeys;
  const threadByKey = useMemo(
    () =>
      new Map(
        orderedThreads.map(
          (thread) =>
            [scopedThreadKey(scopeThreadRef(thread.environmentId, thread.id)), thread] as const,
        ),
      ),
    [orderedThreads],
  );
  // Handlers read these through refs: depending on per-update Map/Set
  // identities would give every row a fresh callback prop on each shell
  // event and defeat row memoization during streaming.
  const threadByKeyRef = useRef(threadByKey);

 
const DEFAULT_EXPORT_INTERVAL_MS = 1_000;
const CLIENT_TRACING_RESOURCE = {
  serviceName: "t3-web",
  attributes: {
    "service.runtime": "t3-web",
    "service.mode": isElectron ? "electron" : "browser",
    "service.version": APP_VERSION,
  },
} as const;
 
const delegateRuntimeLayer = Layer.mergeAll(
  primaryEnvironmentHttpLayer,
  OtlpExporter.layerFlusher,
  OtlpSerialization.layerJson,
  Layer.succeed(HttpClient.TracerDisabledWhen, () => true),
);
 
let activeDelegate: Tracer.Tracer | null = null;
let activeRuntime: ManagedRuntime.ManagedRuntime<never, never> | null = null;
let activeScope: Scope.Closeable | null = null;
let activeConfigKey: string | null = null;
let configurationGeneration = 0;
let pendingConfiguration = Promise.resolve();
 
export interface ClientTracingConfig {
  readonly exportIntervalMs?: number;
}
 
export const ClientTracingLive = Layer.succeed(
  Tracer.Tracer,
  Tracer.make({
    span(options) {
      return activeDelegate?.span(options) ?? new Tracer.NativeSpan(options);
    },
  }),
);
 
export function configureClientTracing(config: ClientTracingConfig = {}): Promise<void> {
  if (config.exportIntervalMs === undefined && activeConfigKey !== null) {
    return pendingConfiguration;
  }
  pendingConfiguration = pendingConfiguration.finally(() => applyClientTracingConfig(config));
  return pendingConfiguration;
}
 
async function applyClientTracingConfig(config: ClientTracingConfig): Promise<void> {
  const otlpTracesUrl = resolvePrimaryEnvironmentHttpUrl("/api/observability/v1/traces");
  const exportIntervalMs = Math.max(10, config.exportIntervalMs ?? DEFAULT_EXPORT_INTERVAL_MS);
  const nextConfigKey = `${otlpTracesUrl}|${exportIntervalMs}`;
 
  if (activeConfigKey === nextConfigKey && activeDelegate !== null) {
    return;
  }
 
  activeConfigKey = nextConfigKey;
  const generation = ++configurationGeneration;
 
  const previousRuntime = activeRuntime;
  const previousScope = activeScope;
 
  activeDelegate = null;
  activeRuntime = null;
  activeScope = null;
 
  await disposeTracerRuntime(previousRuntime, previousScope);
 
  const runtime = ManagedRuntime.make(delegateRuntimeLayer);
  const scope = runtime.runSync(Scope.make());
 
  const delegateResult = await settleAsyncResult(() =>
    runtime.runPromiseExit(
      Scope.provide(scope)(
        OtlpTracer.make({
          url: otlpTracesUrl,
          exportInterval: `${exportIntervalMs} millis`,
          resource: CLIENT_TRACING_RESOURCE,
        }),
      ),
    ),
  );
  if (delegateResult._tag === "Failure") {