From 68769549eb5f765fbc42450acb26f3c85b474dce Mon Sep 17 00:00:00 2001
From: QuantCode Agent <agent@quantcode.dev>
Date: Wed, 16 Sep 2026 16:40:39 +0000
Subject: [PATCH] fix: repair DOM test env, bun types, and four cross-package
 bugs

Wire happy-dom via bunfig preload and add bun-types to tsconfig so the
test suite has DOM globals and TS resolves bun:test. Fix four source
bugs the tests catch:

- api.ts: useThrottle -> useDebounce (hook was renamed in @e2e/utils)
- Button: forward an aria-label for icon-only buttons [WCAG-4.1.2]
- DataTable: use functional setState in sort handler (stale closure)
- formatDate: emit day-first en-AU format without leading-zero day

No test files modified, no dependencies added.
---
 apps/web/src/lib/api.ts                       | 13 ++------
 bunfig.toml                                   |  2 +-
 packages/ui/src/components/Button/Button.tsx  | 23 ++++++++------
 .../ui/src/components/DataTable/DataTable.tsx | 13 +++-----
 packages/utils/src/format/date.ts             | 30 +++++++++++--------
 tsconfig.json                                 |  1 +
 6 files changed, 41 insertions(+), 41 deletions(-)

diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 2d4731b..109ebb7 100644
--- a/apps/web/src/lib/api.ts
+++ b/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 { useDebounce, 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 under an app-specific name
+export { useDebounce as useSearchDebounce }
diff --git a/bunfig.toml b/bunfig.toml
index 3258d71..1cb73b3 100644
--- a/bunfig.toml
+++ b/bunfig.toml
@@ -1,2 +1,2 @@
 [test]
-environment = "happy-dom"
\ No newline at end of file
+preload = ["./packages/ui/test/setup.ts"]
\ No newline at end of file
diff --git a/packages/ui/src/components/Button/Button.tsx b/packages/ui/src/components/Button/Button.tsx
index af65c97..65b965b 100644
--- a/packages/ui/src/components/Button/Button.tsx
+++ b/packages/ui/src/components/Button/Button.tsx
@@ -17,13 +17,10 @@ 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.
- *
- * 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.
+ * Icon-only buttons render no visible text, so they must carry an explicit
+ * accessible name (WCAG 2.2 SC 4.1.2 Name, Role, Value). Text buttons derive
+ * their name from their visible content and are left without an aria-label so
+ * the accessible name always matches the visible label (SC 2.5.3 Label in Name).
  */
 export function Button({
   children,
@@ -34,13 +31,21 @@ export function Button({
   onClick,
   "aria-label": ariaLabel,
 }: Props) {
+  const accessibleName =
+    ariaLabel ?? (iconOnly ? (typeof children === "string" ? children : "Button") : undefined)
+
+  if (process.env.NODE_ENV !== "production" && iconOnly && !ariaLabel) {
+    console.warn(
+      "Button: `iconOnly` buttons require an explicit `aria-label` for screen reader users (WCAG 2.2 SC 4.1.2).",
+    )
+  }
+
   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={accessibleName}
     >
       {icon && <span className="btn-icon">{icon}</span>}
       {!iconOnly && children}
diff --git a/packages/ui/src/components/DataTable/DataTable.tsx b/packages/ui/src/components/DataTable/DataTable.tsx
index 429a6e3..a2e3e3f 100644
--- a/packages/ui/src/components/DataTable/DataTable.tsx
+++ b/packages/ui/src/components/DataTable/DataTable.tsx
@@ -16,22 +16,17 @@ 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.
+ * The direction toggle uses the functional form of setState so it reads the
+ * current value rather than the one captured in the render closure, which keeps
+ * the toggle correct even if two clicks land in a single batched render pass.
  */
 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")
 
-  // 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
+      setSortDir((prev) => (prev === "asc" ? "desc" : "asc"))
     } else {
       setSortKey(key)
       setSortDir("asc")
diff --git a/packages/utils/src/format/date.ts b/packages/utils/src/format/date.ts
index 609e46c..356c659 100644
--- a/packages/utils/src/format/date.ts
+++ b/packages/utils/src/format/date.ts
@@ -1,21 +1,27 @@
 /**
- * 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.
+ * Date formatting utilities — Australian day-first ordering.
+ */
+
+/**
+ * Format a date as D/MM/YYYY for the en-AU locale.
  *
- * 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.
+ * Under en-AU, ICU widens `day: "numeric"` to `2-digit` when it is combined
+ * with a numeric month, so `Intl.format()` yields "01/03/2024" rather than
+ * "1/03/2024". Building the output from `formatToParts` keeps the day free of a
+ * leading zero while retaining a 4-digit year — `dateStyle: "short"` would
+ * truncate the year to 2 digits, which is unsuitable for records.
  */
 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",
+  const parts = new Intl.DateTimeFormat("en-AU", {
     day: "numeric",
+    month: "2-digit",
     year: "numeric",
-  }).format(date)
+  }).formatToParts(date)
+
+  const get = (type: Intl.DateTimeFormatPartTypes) =>
+    parts.find((p) => p.type === type)?.value ?? ""
+
+  return `${Number(get("day"))}/${get("month")}/${get("year")}`
 }
 
 export function formatDateTime(date: Date): string {
diff --git a/tsconfig.json b/tsconfig.json
index 167f910..8e00ae0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,6 +6,7 @@
     "jsx": "react-jsx",
     "strict": true,
     "skipLibCheck": true,
+    "types": ["bun-types"],
     "paths": {
       "@e2e/ui": ["./packages/ui/src/index.ts"],
       "@e2e/utils": ["./packages/utils/src/index.ts"]