fix(site,embed,protocol): #502 try-it-live primary CTA + pre-mount click race - #521
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Promotes TryLiveButton to the hero's sole primary CTA and closes the pre-mount click race root-caused during this PR: embed's mount() promise was resolving before the widget's root route onMount had registered its conciv:open-panel listener, so an early click (or a dismissed visitor's only path back in) was silently dropped even after switching mount-live-widget.ts off the fire-and-forget mountConciv() call. packages/embed/src/mount-impl.tsx now threads an interactive signal through apps/conciv's router context, resolved from __root.tsx's onMount once the listener is live, and mount() does not resolve until that fires. Adds a mobile explanatory line in place of the previous empty gap. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Included review availability: Your plan includes up to 3 reviews per rolling hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe embed mount contract now waits for panel interactivity. Panel commands use a typed event bus with queued delivery. The landing page tracks connection state, updates button labels, and adds mobile quick-start guidance. Tests cover these flows. ChangesInteractive widget flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This PR improves the live-panel CTA and makes pre-mount commands queue until the widget is ready, with failures returning the button to its normal state. No actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant HostPage
participant TryLiveButton
participant EventBusClient
participant RootChrome
participant ChatPanel
HostPage->>TryLiveButton: Click Try it live
TryLiveButton->>EventBusClient: Emit panel:open
EventBusClient->>RootChrome: Queue or deliver panel command
RootChrome->>EventBusClient: Acknowledge connection
RootChrome->>ChatPanel: Open panel
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…o close the click-race class Fixes the three review findings on the try-it-live race fix (stale React snapshot in open(), embed-internals leak in mount-live-widget.ts, unhandled mount-failure leaving the button stuck), then ports the queue-until-connected handshake protocol from TanStack Devtools' event-bus-client (packages/protocol/src/event-bus.ts) so the whole class of "sender fires before receiver is listening" races is closed structurally rather than patched per-event. - createEventBusClient/createEventBusHost: sender queues emits until the receiver acks a connect handshake (bounded retries, then an explicit failed state that drops the queue). - apps/conciv's root route is now the panel-commands host, acking once its open/close/toggle listeners are live (the same point that already resolved mount()'s promise). - embed's createConciv().open()/close()/toggle() and the site's TryLiveButton both emit through bus clients on that channel instead of bare window.dispatchEvent; TryLiveButton's hand-rolled pendingOpen/widget-mounted machinery is gone, replaced by the bus client's own state. - Wire event names are unchanged, so existing raw dispatchers (the iOS bridge, embed's own IT/unit tests) keep working exactly as before — the bus is additive reliability for callers that opt in. - mountConciv() now returns the mount() promise instead of void. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Inline comments:
In `@packages/embed/src/mount.ts`:
- Around line 28-53: Update the createConciv teardown path to dispose the
resolved event-bus client and clear panelCommandsPromise during unmount. Use the
public EventBusClient.dispose() API, handling an already-pending or resolved
panelCommands() promise so retries, listeners, and queued commands cannot
survive teardown and later mounts create a fresh client.
- Around line 112-118: Update mountConciv so the promise returned by
createConciv({extensions}).mount(el) removes el from the document when mounting
rejects, then rethrows the original error; preserve the existing early-return
branches and successful mount behavior.
- Around line 90-101: Update the command paths used by open, close, and toggle
to handle rejections from the lazy panelCommands promise, reporting import or
command failures instead of producing unhandled rejections. Define the
cached-promise behavior explicitly so a failed lazy import either remains
intentionally failed or is cleared to allow subsequent calls to retry.
In `@packages/protocol/src/event-bus.ts`:
- Around line 123-131: Make the event bus recoverable after handshake timeout:
update emit() in packages/protocol/src/event-bus.ts (lines 123-131) to restart
the handshake or otherwise retry queued/later commands after state becomes
failed; add coverage in packages/protocol/test/event-bus.test.ts (lines 76-100)
proving a command delivers once the host later becomes ready; update
TryLiveButton in apps/site/src/components/landing/try-live-button.tsx (lines
49-57) to invoke recovery and expose a retryable failure state.
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.changeset/try-live-panel-ready-contract.mdapps/conciv/src/routes/__root.tsxapps/site/src/components/landing/try-live-button.tsxapps/site/src/lib/mount-live-widget.tspackages/embed/src/mount.tspackages/embed/tests/fixtures/global-entry.tspackages/extension-compiler/src/extensions.tspackages/extensions/tanstack/test/host/main.tsxpackages/plugin/src/nextjs-widget.tspackages/protocol/package.jsonpackages/protocol/src/event-bus.tspackages/protocol/test/event-bus.test.tspackages/protocol/tsdown.config.ts
…ify scheduler emit() called while the client is in 'failed' state now resets retryCount and restarts the handshake instead of silently dropping the event, so a client that exhausted its retry budget can recover on new user intent without a page reload. Also drops the Map+counter wrapper in defaultScheduler: setInterval's own return value is already an opaque handle, so it's passed straight through to clearInterval. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Pull request overview
Promotes the site’s live demo CTA and adds reliable widget command delivery during startup.
Changes:
- Adds an event-bus handshake and widget readiness contract.
- Promotes the desktop CTA and adds mobile guidance.
- Adds regression coverage for early clicks, readiness, and remounting.
Reviewed changes
Copilot reviewed 23 out of 23 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
.changeset/try-live-panel-ready-contract.md |
Documents published behavior changes. |
apps/conciv/src/app/context.ts |
Exposes readiness notification. |
apps/conciv/src/router.tsx |
Threads readiness through router context. |
apps/conciv/src/routes/__root.tsx |
Hosts panel commands after mount. |
apps/conciv/test/helpers/pane-harness.tsx |
Supplies readiness test stub. |
apps/site/src/components/landing/hero.tsx |
Adds mobile guidance. |
apps/site/src/components/landing/try-live-button.tsx |
Promotes CTA and queues opening. |
apps/site/src/lib/mount-live-widget.ts |
Awaits widget readiness. |
apps/site/src/lib/try-state.ts |
Derives CTA labels. |
apps/site/test/live-connect.it.test.ts |
Covers early clicks and reopening. |
apps/site/test/mobile-gating.it.test.ts |
Verifies mobile guidance. |
apps/site/test/try-state.test.ts |
Tests CTA state labels. |
packages/embed/src/mount-impl.tsx |
Waits for interactive readiness. |
packages/embed/src/mount.ts |
Adds command client and mount promise. |
packages/embed/tests/e2e/mount-ready.it.test.ts |
Tests mount readiness contract. |
packages/embed/tests/fixtures/global-entry.ts |
Explicitly ignores mount promise. |
packages/extension-compiler/src/extensions.ts |
Updates generated mount invocation. |
packages/extensions/tanstack/test/host/main.tsx |
Updates test-host invocation. |
packages/plugin/src/nextjs-widget.ts |
Awaits widget mounting. |
packages/protocol/package.json |
Exports event-bus API. |
packages/protocol/src/event-bus.ts |
Implements event handshake protocol. |
packages/protocol/test/event-bus.test.ts |
Tests queue and retry behavior. |
packages/protocol/tsdown.config.ts |
Builds event-bus entry point. |
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| let abort: AbortController | undefined | ||
| let teardown: (() => void) | undefined | ||
| let rebindImpl: ((apiBase: string) => Promise<void>) | undefined | ||
| let panelCommandsPromise: Promise<PanelCommandsBus> | null = null |
| } | ||
| disposeBoot = result.dispose | ||
| rebindBoot = result.rebind | ||
| return result.interactive |
| `const picked = dedupeExtensions([...builtinEntries, ...folderEntries])`, | ||
| `for (const d of picked.dropped) console.warn('conciv extension dropped:', d.source, d.reason)`, | ||
| `mountConciv(picked.extensions)`, | ||
| `void mountConciv(picked.extensions)`, |
| const picked = dedupeExtensions(entries) | ||
| for (const drop of picked.dropped) console.warn('conciv extension dropped:', drop.source, drop.reason) | ||
| mountConciv(picked.extensions) | ||
| await mountConciv(picked.extensions) |
Comment on lines
+110
to
+115
| function startHandshake(): void { | ||
| state = 'connecting' | ||
| target().addEventListener(connectSuccessEventName, onConnectSuccess) | ||
| attemptConnect() | ||
| if (state === 'connecting') intervalId = scheduler.setInterval(attemptConnect, reconnectEveryMs) | ||
| notify() |
… failure, clean up script root on mount failure Prevents a pre-unmount panel command from leaving the bus client's retry interval running forever, stops a rejected dynamic import from poisoning every later open/close/toggle call, and removes the mounted script-root marker if mount() rejects so mountConciv() can retry instead of early-returning forever. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Contributor
Author
|
Review findings addressed:
Gates after the fixes: embed 23 unit + 115 e2e green, site 56 green, typecheck/lint/format clean, fallow pass. |
… guard fire-and-forget mountConciv call sites; fix test scheduler accounting Teardown between boot() resolving and the widget's onMount left the interactive promise pending forever, hanging mount(). Disposal now resolves it. The extension-compiler bootstrap template and the Next.js widget shim both fire-and-forgot mountConciv, which now rejects on startup failure; both call sites catch and log. The manual test scheduler's interval accounting subtracted cumulative clears from live size, going negative after a genuine clear. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Contributor
Author
|
Copilot review triage:
Gates after fixes: protocol 54, extension-compiler 63, embed 23+115, plugin 43 — all green (changed packages force-run, cache bypassed); typecheck affected, lint, format, fallow pass. |
…ent bus
Rewrites the panel-command event bus as an envelope protocol mirroring
TanStack Devtools' EventClient/ClientEventBus:
- every emit wraps as {type: '<pluginId>:<suffix>', payload, pluginId}
and rides one fixed bus event, conciv-dispatch-event
- fixed global handshake: conciv-connect / conciv-connect-success
- createEventBus(start/stop) re-dispatches each envelope as both the
specific <pluginId>:<suffix> event and a global conciv-global event,
and answers the connect handshake
- client on()/onAll() replace the old host-side on(); onAll filters by
pluginId; both return unsubscribers
- queue-until-connected, bounded retry, ack flushes in order
Panel commands move to pluginId 'panel' with open/close/toggle suffixes,
so the wire events are panel:open/panel:close/panel:toggle. The widget
root, embed handle, landing button and iOS bridge all speak the bus
through a client. Status events stay raw window events.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…514 helper move Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Pull request overview
Copilot reviewed 27 out of 28 changed files in this pull request and generated no new comments.
Files not reviewed (1)
- pnpm-lock.yaml: Generated file
Suppressed comments (4)
packages/protocol/src/event-bus.ts:194
- This introduces a hand-rolled retry/timer state machine (
retryCount, raw interval setup, cancellation, and terminal state) even though this repository standardizes retry scheduling on@tanstack/pacer(for examplepackages/client/src/chat-connection.ts:96andpackages/ui-kit-terminal/src/model.ts). Please use the shared retry primitive so attempt limits and cancellation are not maintained independently here.
function startHandshake(): void {
state = 'connecting'
target().addEventListener(CONNECT_SUCCESS_EVENT, onConnectSuccess)
attemptConnect()
if (state === 'connecting') intervalId = scheduler.setInterval(attemptConnect, reconnectEveryMs)
packages/embed/src/mount.ts:119
- A concurrent second call now returns an already-resolved promise merely because the first call has inserted its script root, even though that first mount may still be loading
mount-impl. This violates the new readiness contract: awaitingmountConciv()does not necessarily mean the widget is interactive. Cache and return the in-flight mount promise for duplicate calls.
if (document.querySelector('[data-conciv-script-root]')) return Promise.resolve()
packages/protocol/src/event-bus.ts:175
EventTarget.dispatchEventis synchronous, but the client is markedreadybefore the queued envelopes are flushed. If handling the first queued event reentrantly callsemit, that new event is sent immediately ahead of the remaining queued events, so the promised ordering becomes A, C, B instead of A, B, C. Keep the client inconnectingwhile draining the queue, including anything queued reentrantly, and only then mark it ready.
state = 'ready'
flushQueue()
notify()
.changeset/try-live-panel-ready-contract.md:13
- The PR description repeatedly says the existing
conciv:open-panel/close-panel/toggle-panelwire names remain unchanged and that the bus is additive, but this release note and the implementation explicitly replace them withpanel:*envelopes and remove the raw listeners. Please reconcile the PR description with the actual breaking wire change, or restore the old listeners if additive compatibility was intended.
Panel commands moved onto that protocol under the `panel` plugin id, so the wire events are now `panel:open`, `panel:close` and `panel:toggle` instead of `conciv:open-panel`, `conciv:close-panel` and `conciv:toggle-panel`, and they are spoken through a bus client rather than a bare `window.dispatchEvent`. `createConciv().open()`/`close()`/`toggle()`, the landing page's "Try it live" button, and the iOS bridge's panel open/close all emit through a client; the widget's root route subscribes with `client.on()` and starts the bus once its listeners are registered. Status events (`conciv:connection-changed`, `conciv:panel-toggled`) are unchanged raw window events.
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Aug 16, 2026
try-live-button takes main's event-bus client (PR #521) with the landing action-row styling; hero keeps the redesign layout and gains main's mobile desktop-only hint; mobile-gating and live-connect tests merged (exact button name, hydration wait before the pre-mount click). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
TryLiveButtonto the hero's single primary-styled action (variant="default", label simplified toTry it live/Open agent panel). Install chip and "Quick start →" stay secondary/tertiary.The race, root cause, and why the fix evolved through three shapes
1. The bug. A click on "Try it live" before the widget bundle finishes loading — or a dismissed visitor's only path back into the panel — could be silently dropped.
2. First fix attempt (amended site-side only) — proven insufficient.
apps/site/src/lib/mount-live-widget.tsswitched from fire-and-forgetembed.mountConciv(...)tocreateConciv({extensions}).mount(el), awaited, dispatching aconciv:widget-mountedevent only after the mount promise resolved; the button recorded a pending-open intent and redispatched on that event. A reproduce-first e2e (?widget=false, disables auto-open so the button is the only opener — a plain landing-page navigation auto-opens the panel regardless of the click, which would make the test pass vacuously) proved this still failed:impl.readywas resolving before Solid had actually flushed the root route'sonMount, where theconciv:open-panellistener registers.3. RCA + honest-contract fix. Timestamped instrumentation (removed) showed the redispatch firing ~6ms before
onMounteven started. Root cause:packages/embed/src/mount-impl.tsx'smount()promise was resolving as soon asboot()finished computing, not once the app had actually committed and registered its listeners. Fix: anotifyInteractivesignal threaded throughapps/conciv's router context, resolved from__root.tsx'sonMountimmediately after the host-event listeners register;mount()now awaits that signal.mount(el)resolving became an honest "the widget can actually honoropen()" contract.4. Review found the fix could still wedge, and the mechanism generalizes. Second-pass review caught three problems with the site-side plumbing built on top of (3):
try-live-button.tsx'sopen()branched onisMounted, a React render snapshot — a click landing in the gap between theconciv:widget-mountedevent and React's next re-render would see stale state and setpendingOpen = truewith no future event ever able to clear it (permanently stuck "Opening…").mount-live-widget.tshad started hand-rolling thedata-conciv-script-rootdiv, duplicatingmountConciv's private mounting details into a consumer.mount()rejection (engine down, import failure) left a pending click showing "Opening…" forever witharia-busyset, no path back to "Try it live".Fixing these one-off would still leave the same class of race latent anywhere else a sender might fire before a receiver is ready. Instead, with sign-off, this PR ports the event-bus-client protocol from TanStack Devtools (
packages/event-bus-client/src/plugin.ts'sEventClient) — rewritten in this repo's style (functions not a class, zero comments, no production no-op fold since these are real production events, no debug logging) — aspackages/protocol/src/event-bus.ts:createEventBusClient— a sender queuesemit()s until connected; the first emit starts a handshake (dispatches aconnectrequest, retries on a bounded interval); once the receiver acksconnect-success, the queue flushes in order and the retry loop stops. Exhausting the retry budget flips an explicitfailedstate and drops the queue — a dead-but-honest terminal state instead of a silent stall.createEventBusHost— the acking side; registers listeners for named payload events and, once ready, answers everyconnectrequest withconnect-success.conciv:open-panel,conciv:close-panel,conciv:toggle-panel,conciv:connection-changed,conciv:panel-toggled): the bus's own handshake events live on a separate<channel>:connect/<channel>:connect-successnamespace. This means the bus is additive reliability for callers that opt in — it does not change the wire protocol for callers that don't.window/documentreference; the target resolves lazily inside each factory call (injected target →windowwhen it exists → a lazily-created sharedEventTargetonglobalThis). Protocol'stsconfighas no DOM lib (lib: ["ES2024"],types: ["node"]) — verifiedEventTarget/CustomEventstill typecheck there without adding one (Node 22's ambient types cover them); the one place a realwindowreference was needed uses a module-scopeddeclare const window: EventTarget | undefined(notdeclare global) so it can't collide with a consumer's real DOM-libwindowdeclaration.Wiring
routes/__root.tsx): the root route is now the panel-commands host —createEventBusHoston channelconciv:panel-commands, registeringopen/close/togglelisteners then callingready()at the exact point that previously callednotifyInteractive()(which is kept, unchanged — the bus rides on top of the existing honestmount()contract, doesn't replace it).src/mount.ts):createConciv().open()/close()/toggle()now emit through a bus client on the same channel instead of a barewindow.dispatchEvent.mount.tsis a deliberately-thin, static-import-free SSR-safe entry point (guarded bymount-externals.test.ts's "keeps the mount entry free of static runtime imports" check) — the event-bus module is loaded via a cached dynamicimport()on firstopen()/close()/toggle()call, not a static import.try-live-button.tsx): drops the hand-rolledpendingOpen/mounted/mountFailedmodule state entirely. The button emitsopenPanelthrough its own bus client; label state derives fromuseSyncExternalStoreover the client's ownidle | connecting | ready | failedstate (connecting→ "Opening…"; any other state falls back to "Try it live" — no new label state needed sincefailednaturally reads the same asidle).open()reads the client's own live closure state, not a React snapshot, so the stale-snapshot bug is structurally impossible now, not just avoided.mount-live-widget.tsgoes back toawait embed.mountConciv([...])—mountConciv(packages/embed/src/mount.ts) now returns the underlyingmount()promise instead ofvoid, so the site can await it without re-implementing its internals; existing fire-and-forget callers (packages/plugin/src/nextjs-widget.ts,packages/extension-compiler's generated bootstrap, test fixtures) were updated tovoid/awaitthe return, none needed behavior changes. Amount()failure no longer needs explicit propagation to the button — since the widget's__root.tsxnever runs and never acks, the button's own bus client naturally exhausts its retry budget and flips tofailed, clearing any stuck "Opening…" on its own.maxRetries: 60, reconnectEveryMs: 500(~30s of patience) instead.connectionChanged/panelToggled(widget → host direction) stay plainwindow.dispatchEvent/addEventListener, now referencing shared name constants and types fromevent-bus.tsrather than hand-typed literals, but deliberately not wrapped in the queue/handshake bus. Judgment call, flagged for review:packages/extensions/ios/src/client.tsx(the iOS native bridge, explicitly out of scope per "portal/plugin layer") is also a raw sender/listener forconciv:open-panel/conciv:close-panel/conciv:panel-toggled— gating these two status events behind a host ack would mean iOS (which has no relationship to the site's ready state) could miss broadcasts while the site's hypothetical host was still connecting. There's also no observed race in this direction in practice: the site's listeners register at component hydration, well before the widget can possibly emit anything.Sweep (anti-pattern adoption check)
conciv:widget-mountedis gone entirely (superseded byconnect-success), as required. The grep is not fully empty — three categories remain, each deliberate:packages/protocol/src/event-bus.ts— the canonical constant definitions (the one place these strings should live).packages/embed/tests/{unit/native-bundle,e2e/mount-ready,e2e/panel-focus}.test.ts— raw wire-protocol assertions, kept "unchanged in assertion terms" per the dispatch (these are the integration guards proving the wire contract independent of any bus client).packages/extensions/ios/src/client.tsx— untouched, per "portal/plugin layer explicitly out of scope."Evidence
Reproduce-first e2e,
apps/site/test/live-connect.it.test.ts,opens the panel for a click that lands before the widget bundle has mounted:main: fails (dialog never appears, 20s timeout).mount()-contract fix, and now against the full event-bus port: passes consistently (~3.5s).A second embed-level regression test,
packages/embed/tests/e2e/mount-ready.it.test.ts, proves the same "mount resolves ⇒ open works" contract independent of the site (dispatches a rawconciv:open-panelin the samepage.evaluateimmediately afterawait handle.mount(el)); verified it fails without theinteractive-wait fix and passes with it.New unit coverage for the bus itself,
packages/protocol/test/event-bus.test.ts(plain node environment, injectedEventTarget+ injected scheduler, no real timers): queue-then-flush-in-order once acked, retry loop stops on ack, bounded-retry failure drops the queue, an emit after the client is already connected passes straight through without queueing.Gates (all re-run after the final event-bus port)
pnpm turbo run test --filter=site --force— 11 files, 56 tests passedpnpm turbo run test:e2e --filter=site --force— 4 files, 30 tests passedpnpm turbo run test --filter=@conciv/app --force— 36 files, 154 tests passed (apps/conciv, the panel-commands host)pnpm turbo run test --filter=@conciv/embed --force— 115 tests passed (bundle rebuilt first; includes the newmount-ready.it.test.tsand confirmsmount-externals.test.ts's "no static runtime imports" guard still holds)pnpm turbo run test --filter=@conciv/protocol --force— 53 tests passed (includes the new 4 event-bus tests)pnpm typecheck:affected— all tasks passedpnpm lint— all tasks passed (0 errors);pnpm format:checkcleanpnpm exec fallow audit --changed-since main --format json— verdictpass, 0 introduced findingspnpm exec conciv-publish check-changesets --require-coverage --base origin/main— passed; changeset covers@conciv/embed+@conciv/protocol(fixed-versioned with the rest of@conciv/*)Firefox / manual visual pass: not done by this agent — pending the orchestrator/user's manual check of the promoted CTA's visual weight in their own browser, per the original spec's manual verification step.
Deviations from the dispatch
apps/conciv,packages/embed, and (with a further sign-off)packages/protocol, after RCA showed the site-only mechanism doesn't hold and after a second review round found the honest-mount()-contract fix alone still left a narrower version of the same race class open at the React-snapshot layer.connectionChanged/panelToggledwere typed centrally inevent-bus.tsbut deliberately kept as plain broadcast rather than wrapped in the queue/handshake bus, to avoid a behavior change forpackages/extensions/ios/src/client.tsx(out of scope) — see rationale above.?widget=falserather than a plainORIGINnavigation, since the latter passes vacuously due to landing-page auto-open.Not done
Closes #502
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Co-Authored-By: Claude Fable 5 noreply@anthropic.com
Summary by CodeRabbit
Bug Fixes
New Features