Animate orders out with a CSS transition instead of the View Transitions API

The prior attempt wrapped the sign-out router.invalidate() in
document.startViewTransition(), but that had two problems: invalidate()
does its own network refetch inside the transition's update callback,
which freezes the page for the round-trip instead of animating
anything, and TanStack Router's invalidate() explicitly opts itself out
of view transitions (sets shouldViewTransition = false) for exactly
that reason. On top of that, OrdersRoute briefly returns null between
the account loader clearing and the guest-orders lookup resolving,
unmounting OrdersListView and wiping any exit-animation state anyway.

Replace it with a plain, self-contained approach:
- OrdersRoute now keeps rendering the last known non-null orders list
  through that brief gap (a lastKnownOrders ref) instead of unmounting
  OrdersListView, so its local animation state survives.
- OrdersListView holds onto the previous non-empty list for
  EXIT_DURATION_MS after it goes empty, applying an `orderExiting`
  class that fades/slides each card out via a plain CSS transition,
  then swaps to the actual empty state once the transition finishes.

This has no dependency on browser view-transition support, network
timing, or router internals.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/components/orders/OrdersListView.module.scss

@@ -71,13 +71,21 @@
   background: $color-surface;
   color: inherit;
   text-decoration: none;
-  transition: border-color 0.15s ease;
+  transition:
+    border-color 0.15s ease,
+    opacity 0.28s ease,
+    transform 0.28s ease;
 
   &:hover {
     border-color: $color-primary;
   }
 }
 
+.orderExiting .order {
+  opacity: 0;
+  transform: translateY(-8px) scale(0.98);
+}
+
 .orderHeader {
   display: flex;
   justify-content: space-between;

src/components/orders/OrdersListView.tsx

@@ -1,4 +1,5 @@
 import { Link } from '@tanstack/react-router'
+import { useEffect, useRef, useState } from 'react'
 
 import type { CustomerOrderSummary } from '#/domain/ordering.ts'
 import { formatPrice } from '#/lib/format.ts'
@@ -9,6 +10,10 @@ type OrdersListViewProps = {
   orders: Array<CustomerOrderSummary>
 }
 
+// Must match the CSS transition duration on .order in
+// OrdersListView.module.scss.
+const EXIT_DURATION_MS = 280
+
 const OrdersIcon = () => (
   <svg
     viewBox="0 0 24 24"
@@ -32,10 +37,32 @@ const formatItems = (items: CustomerOrderSummary['items']) =>
     )
     .join(', ')
 
-export const OrdersListView = ({ orders }: OrdersListViewProps) => (
+export const OrdersListView = ({ orders }: OrdersListViewProps) => {
+  const [displayedOrders, setDisplayedOrders] = useState(orders)
+  const [isExiting, setIsExiting] = useState(false)
+  const hadOrders = useRef(orders.length > 0)
+
+  // Orders can go from populated to empty in one prop update (e.g. signing
+  // out clears them) — keep the previous list on screen just long enough to
+  // fade it out instead of popping straight to the empty state.
+  useEffect(() => {
+    if (orders.length === 0 && hadOrders.current) {
+      hadOrders.current = false
+      setIsExiting(true)
+      const timeout = setTimeout(() => {
+        setDisplayedOrders([])
+        setIsExiting(false)
+      }, EXIT_DURATION_MS)
+      return () => clearTimeout(timeout)
+    }
+    hadOrders.current = orders.length > 0
+    setDisplayedOrders(orders)
+  }, [orders])
+
+  return (
     <section className={styles.page}>
       <h1 className={styles.heading}>Your orders</h1>
-    {orders.length === 0 ? (
+      {displayedOrders.length === 0 ? (
         <div className={styles.empty}>
           <OrdersIcon />
           <p className={styles.emptyTitle}>No orders yet</p>
@@ -48,8 +75,11 @@ export const OrdersListView = ({ orders }: OrdersListViewProps) => (
         </div>
       ) : (
         <ul className={styles.orders}>
-        {orders.map((order) => (
-          <li key={order.id}>
+          {displayedOrders.map((order) => (
+            <li
+              key={order.id}
+              className={isExiting ? styles.orderExiting : undefined}
+            >
               <Link
                 to="/orders/$orderId"
                 params={{ orderId: String(order.id) }}
@@ -65,7 +95,9 @@ export const OrdersListView = ({ orders }: OrdersListViewProps) => (
                   <span className={styles.orderName}>Order #{order.id}</span>
                   <span className={styles.orderStatus}>{order.status}</span>
                 </div>
-              <p className={styles.orderItems}>{formatItems(order.items)}</p>
+                <p className={styles.orderItems}>
+                  {formatItems(order.items)}
+                </p>
                 <p className={styles.orderMeta}>
                   {order.createdAt.toLocaleDateString([], {
                     month: 'short',
@@ -80,3 +112,4 @@ export const OrdersListView = ({ orders }: OrdersListViewProps) => (
       )}
     </section>
   )
+}

src/integrations/better-auth/header-user.tsx

@@ -153,27 +153,7 @@ const BetterAuthHeader = () => {
                   clearBasket()
                   void authClient.signOut({
                     fetchOptions: {
-                      onSuccess: () => {
-                        // Cross-fades the now-cleared Orders list out (and
-                        // the empty state in) instead of popping instantly —
-                        // each order card already carries its own
-                        // `view-transition-name` (see OrdersListView), so
-                        // this reuses that for a proper per-card exit.
-                        if ('startViewTransition' in document) {
-                          // Rejects if the browser can't actually run the
-                          // transition right now (e.g. the tab isn't
-                          // visible) — router.invalidate() still runs either
-                          // way, so there's nothing to handle beyond not
-                          // leaving this as an unhandled rejection.
-                          const transition = document.startViewTransition(() =>
-                            router.invalidate(),
-                          )
-                          transition.ready.catch(() => {})
-                          transition.finished.catch(() => {})
-                        } else {
-                          void router.invalidate()
-                        }
-                      },
+                      onSuccess: () => void router.invalidate(),
                     },
                   })
                 }}

src/routes/orders/index.tsx

@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 
 import { OrdersListView } from '#/components/orders/OrdersListView.tsx'
 import type { CustomerOrderSummary } from '#/domain/ordering.ts'
@@ -25,7 +25,16 @@ const OrdersRoute = () => {
     void getGuestOrders({ data: { refs } }).then(setGuestOrders)
   }, [accountOrders])
 
-  const orders = accountOrders ?? guestOrders
+  const resolvedOrders = accountOrders ?? guestOrders
+
+  // Signing out clears both sources for a moment (the account loader
+  // reruns and comes back null, guest refs were just wiped) before the
+  // guest lookup above resolves to `[]` — keep showing the last known
+  // list through that gap instead of unmounting OrdersListView, so its
+  // own exit animation (see OrdersListView) can actually play.
+  const lastKnownOrders = useRef<Array<CustomerOrderSummary> | null>(null)
+  if (resolvedOrders !== null) lastKnownOrders.current = resolvedOrders
+  const orders = resolvedOrders ?? lastKnownOrders.current
   if (orders === null) return null
 
   return <OrdersListView orders={orders} />