fix: resolve four cross-package test failures in monorepo

- utils: export useSearchDebounce (was renamed); reconcile api.ts import
- ui/Button: forward aria-label; guarantee accessible name for icon-only
  buttons and only mark icon decorative when other name exists (WCAG 4.1.2)
- ui/DataTable: fix stale-closure sort by merging key+dir into one atomic
  functional state update so second click toggles descending
- utils/formatDate: day-first en-AU format without zero-padded day (1/03/2024)

Author: QuantCode Agent

apps/web/src/lib/api.ts

@@ -1,15 +1,8 @@
 /**
  * API client utilities for the web app.
- *
- * BUG: imports `useThrottle` from @e2e/utils, but that hook was renamed to
- * `useDebounce`. This causes a TypeScript error and a runtime crash.
- *
- * Fix: change the import to `useDebounce`.
  */
 
-// BUG: useThrottle no longer exists — was renamed to useDebounce
-import { useThrottle } from "@e2e/utils"
-import { formatDate, formatAUD } from "@e2e/utils"
+import { useSearchDebounce, formatDate, formatAUD } from "@e2e/utils"
 
 export const BASE_URL = process.env.API_URL ?? "http://localhost:3000"
 
@@ -28,5 +21,5 @@ export async function fetchPosts() {
 // Re-export formatting utilities used throughout the app
 export { formatDate, formatAUD }
 
-// Re-export the debounce hook (currently broken import)
-export { useThrottle as useSearchDebounce }
+// Re-export the debounce hook used for search input
+export { useSearchDebounce }

packages/ui/src/components/Button/Button.tsx

@@ -17,14 +17,24 @@ type Props = {
 /**
  * Button component.
  *
- * BUG: When `iconOnly` is true, the button renders without visible text.
- * An `aria-label` is required for screen reader accessibility (WCAG 2.1 SC 4.1.2),
- * but the component does not enforce or warn about its absence.
+ * Every button must expose an accessible name to satisfy WCAG 2.2 SC 4.1.2
+ * (Name, Role, Value). The name comes from the first available of:
  *
- * The test in Button.test.tsx checks that an icon-only button has an accessible name.
- * Fix: throw/warn in development when `iconOnly && !aria-label`, or always render
- * the aria-label attribute when iconOnly is true.
+ *   1. an explicit `aria-label`,
+ *   2. visible text children,
+ *   3. the icon's own text content,
+ *   4. a generic fallback, used only for `iconOnly` buttons whose icon is
+ *      decorative and therefore hidden from assistive technology.
+ *
+ * The icon is only marked `aria-hidden` when one of (1) or (2) already supplies
+ * a name — hiding it otherwise would leave the button anonymous.
  */
+const FALLBACK_LABEL = "Button"
+
+function hasRenderableChildren(children: React.ReactNode): boolean {
+  return children !== undefined && children !== null && children !== false && children !== ""
+}
+
 export function Button({
   children,
   icon,
@@ -34,15 +44,35 @@ export function Button({
   onClick,
   "aria-label": ariaLabel,
 }: Props) {
+  if (iconOnly && !ariaLabel && process.env.NODE_ENV !== "production") {
+    console.warn(
+      "Button: `iconOnly` buttons require an `aria-label` to provide an accessible name (WCAG 2.2 SC 4.1.2).",
+    )
+  }
+
+  // Children are only rendered — and so only contribute a name — when not icon-only.
+  const showsChildren = !iconOnly && hasRenderableChildren(children)
+
+  // Fall back to a generic name only for explicit icon-only buttons: their icon is
+  // treated as decorative, so nothing else can name them. When `iconOnly` is not
+  // set the icon stays exposed and provides the name from its own text content.
+  const accessibleLabel = iconOnly ? (ariaLabel ?? FALLBACK_LABEL) : ariaLabel
+
+  // Safe to hide the icon only once a label or visible text supplies the name.
+  const iconIsDecorative = Boolean(accessibleLabel) || showsChildren
+
   return (
     <button
       className={`btn btn-${variant}`}
       disabled={disabled}
       onClick={onClick}
-      // BUG: aria-label is not applied when iconOnly is true and no ariaLabel is passed
-      // The component should enforce aria-label for icon-only buttons
+      aria-label={accessibleLabel}
     >
-      {icon && <span className="btn-icon">{icon}</span>}
+      {icon && (
+        <span className="btn-icon" aria-hidden={iconIsDecorative || undefined}>
+          {icon}
+        </span>
+      )}
       {!iconOnly && children}
     </button>
   )

packages/ui/src/components/DataTable/DataTable.tsx

@@ -16,26 +16,23 @@ type Props<T extends Record<string, unknown>> = {
 /**
  * DataTable with client-side sorting.
  *
- * BUG: The sort handler has a stale closure — it captures `sortDir` at the
- * time the handler is created, so toggling sort direction does not work
- * correctly after the first click. The second click always sorts in the same
- * direction as the first.
- *
- * Fix: use the functional form of setState — `setSortDir(prev => ...)` —
- * so the toggle always reads the current value.
+ * Sorting state is updated via the functional form of setState so the toggle
+ * always reads the committed value rather than the value captured when the
+ * handler was created.
  */
 export function DataTable<T extends Record<string, unknown>>({ data, columns }: Props<T>) {
-  const [sortKey, setSortKey] = useState<keyof T | null>(null)
-  const [sortDir, setSortDir] = useState<SortDir>("asc")
+  const [sort, setSort] = useState<{ key: keyof T | null; dir: SortDir }>({
+    key: null,
+    dir: "asc",
+  })
+  const { key: sortKey, dir: sortDir } = sort
 
-  // BUG: stale closure — sortDir is captured at handler creation time
   const handleSort = (key: keyof T) => {
-    if (sortKey === key) {
-      setSortDir(sortDir === "asc" ? "desc" : "asc") // BUG: reads stale sortDir
-    } else {
-      setSortKey(key)
-      setSortDir("asc")
-    }
+    setSort((prev) =>
+      prev.key === key
+        ? { key, dir: prev.dir === "asc" ? "desc" : "asc" }
+        : { key, dir: "asc" },
+    )
   }
 
   const sorted = sortKey

packages/utils/src/format/date.ts

@@ -1,21 +1,21 @@
 /**
  * Date formatting utilities.
  *
- * BUG: formatDate passes `'en-AU'` as the locale but then uses a US-style
- * format string option (`month: 'numeric'` before `day: 'numeric'`), which
- * produces MM/DD/YYYY output instead of DD/MM/YYYY for Australian dates.
- *
- * Fix: use `dateStyle: 'short'` with `'en-AU'` locale, which correctly
- * produces DD/MM/YYYY, or explicitly set `day: 'numeric', month: 'numeric', year: 'numeric'`
- * and rely on the locale to order them correctly.
+ * Australian date convention is day-first (D/MM/YYYY). The `en-AU` locale
+ * orders the fields correctly but zero-pads a single-digit day, so the day
+ * part is un-padded via `formatToParts` — giving "1/03/2024" rather than
+ * "01/03/2024", while the month stays two-digit and the year four-digit.
  */
+const DATE_PARTS_FORMATTER = new Intl.DateTimeFormat("en-AU", {
+  day: "numeric",
+  month: "2-digit",
+  year: "numeric",
+})
+
 export function formatDate(date: Date): string {
-  // BUG: explicit field order overrides locale ordering — produces M/D/YYYY not D/M/YYYY
-  return new Intl.DateTimeFormat("en-AU", {
-    month: "numeric",
-    day: "numeric",
-    year: "numeric",
-  }).format(date)
+  return DATE_PARTS_FORMATTER.formatToParts(date)
+    .map((part) => (part.type === "day" ? String(Number(part.value)) : part.value))
+    .join("")
 }
 
 export function formatDateTime(date: Date): string {

packages/utils/src/index.ts

@@ -1,4 +1,4 @@
-export { useDebounce } from "./hooks/useDebounce"
+export { useDebounce, useDebounce as useSearchDebounce } from "./hooks/useDebounce"
 export { usePagination } from "./hooks/usePagination"
 export { formatAUD } from "./format/currency"
 export { formatDate, formatDateTime } from "./format/date"