feat: introduce core-events package with event bus, hooks, and a web showcase demo

2026-05-28 11:20:35 +07:00
parent 3621f837f6
commit 6fde65f04e
21 changed files with 2021 additions and 7 deletions
@@ -269,7 +269,26 @@ Provides a Hybrid Namespace Architecture combining a centralized i18n engine wit

 ---

-### 8. `packages/utils`
+### 8. `packages/core-events`
+
+The **decoupled Nervous System** for the monorepo. 
+
+Provides a highly performant, strictly typed Event Bus (Pub/Sub) powered by `mitt`. It allows independent modules to communicate seamlessly without tightly coupling their codebases or triggering expensive global React tree re-renders.
+
+**Key Capabilities**:
+
+| Feature | Description |
+|---|---|
+| 🧩 Zero Coupling | Publishers and subscribers interact via blind events, eliminating direct module imports and circular dependencies. |
+| ⚡ Extreme Performance | Enables targeted DOM updates for high-frequency data streams (e.g., WebSockets) without re-rendering parent components. |
+| 🧹 Memory Safety | Native `useAppEvent` hook automatically unsubscribes on component unmount, preventing SPA memory leaks. |
+| 🛡️ Strict Contracts | Centralized `events.registry.ts` enforces payload shapes via TypeScript, ensuring cross-module data safety. |
+
+**Documentation**: [README.md](packages/core-events/README.md)
+
+---
+
+### 9. `packages/utils`

 Shared business logic and reusable utility modules that can be consumed across multiple applications. Fully tested using Vitest.

@@ -277,7 +296,7 @@ This package is intended to hold non-UI, cross-cutting logic such as date/time h

 ---

-### 9. `packages/ui`
+### 10. `packages/ui`

 Shared UI component library (Buttons, Inputs, Cards, Layouts).

@@ -286,7 +305,7 @@ Shared UI component library (Buttons, Inputs, Cards, Layouts).

 ---

-### 10. `packages/configs`
+### 11. `packages/configs`

 Single source of truth for tooling configuration.

@@ -14,6 +14,7 @@
  },
  "dependencies": {
    "@repo/core-api": "workspace:*",
+    "@repo/core-events": "workspace:*",
    "@repo/core-i18n": "workspace:*",
    "@repo/core-storage": "workspace:*",
    "@repo/ui": "workspace:*",
@@ -0,0 +1,63 @@
+import { useState } from 'react';
+import { usePublishEvent } from '@repo/core-events';
+import { Button, Group, Stack, TextInput, Badge } from '@repo/ui/components';
+
+// ─── ProfileSettingsUI ──────────────────────────────────────────
+
+/**
+ * A profile settings form that publishes `AUTH:PROFILE_UPDATED`
+ * when the user saves changes.
+ *
+ * **Decoupling principle:**
+ * This component doesn't know about IndexedDB, localStorage,
+ * or any storage mechanism. It simply announces that the profile
+ * has been updated. Any number of listeners can react to this
+ * event independently:
+ *
+ * - `StorageSyncListener` persists to IndexedDB
+ * - A hypothetical `AnalyticsListener` could send to Mixpanel
+ * - A hypothetical `AvatarCacheListener` could pre-warm a CDN
+ *
+ * All without modifying this component.
+ */
+export function ProfileSettingsUI() {
+  const publish = usePublishEvent();
+
+  const [name, setName] = useState('Firman Ramdhani');
+  const [email, setEmail] = useState('firman@eigen.co.id');
+  const [avatar, setAvatar] = useState('https://ui-avatars.com/api/?name=FM&background=4263eb&color=fff');
+  const [saveCount, setSaveCount] = useState(0);
+
+  const handleSave = () => {
+    publish('AUTH:PROFILE_UPDATED', {
+      id: 'user-1',
+      name,
+      email,
+      avatar,
+      updatedAt: Date.now(),
+    });
+    setSaveCount((c) => c + 1);
+  };
+
+  return (
+    <Stack gap="sm">
+      <Group grow align="flex-start">
+        <TextInput label="Full Name" value={name} onChange={(e) => setName(e.currentTarget.value)} size="sm" />
+        <TextInput label="Email" value={email} onChange={(e) => setEmail(e.currentTarget.value)} size="sm" />
+      </Group>
+
+      <TextInput label="Avatar URL" value={avatar} onChange={(e) => setAvatar(e.currentTarget.value)} size="sm" />
+
+      <Group>
+        <Button variant="filled" color="brand" onClick={handleSave}>
+          💾 Save Profile
+        </Button>
+        {saveCount > 0 && (
+          <Badge color="success" variant="light">
+            Synced {saveCount}×
+          </Badge>
+        )}
+      </Group>
+    </Stack>
+  );
+}
@@ -0,0 +1,64 @@
+import { useAppEvent } from '@repo/core-events';
+import type { ProfileUpdatedPayload } from '@repo/core-events';
+import { secureIndexedDB } from '@repo/core-storage';
+
+// ─── Props ──────────────────────────────────────────────────────
+
+interface StorageSyncListenerProps {
+  /** Callback to log messages to the parent demo UI. */
+  onLog: (message: string) => void;
+}
+
+// ─── StorageSyncListener ────────────────────────────────────────
+
+/**
+ * Headless component that listens to `AUTH:PROFILE_UPDATED` events
+ * and persists the profile data to IndexedDB via `@repo/core-storage`.
+ *
+ * This component renders nothing — it is purely a side-effect listener.
+ * Mount it anywhere in the React tree; it will auto-cleanup on unmount.
+ *
+ * **Architecture notes for production use:**
+ *
+ * 1. The `StorageKey` registry in `@repo/core-storage` should include
+ *    a `USER_PROFILE` key (which it already does — see `storage.key.ts`).
+ *    This means `secureIndexedDB.setItem('user_profile', payload)` will
+ *    automatically encrypt the data at rest because `user_profile` is
+ *    listed in `ENCRYPTED_KEYS`.
+ *
+ * 2. If you need to store additional event-driven data, extend `StorageKey`:
+ *    ```ts
+ *    // In packages/core-storage/src/storage.key.ts:
+ *    export const StorageKey = {
+ *      ...existing,
+ *      LAST_PROFILE_SYNC: 'last_profile_sync',
+ *    } as const;
+ *    ```
+ *
+ * 3. For bidirectional sync (storage → event), consider adding a
+ *    `STORAGE:PROFILE_LOADED` event to `AppEvents` that fires when
+ *    the app reads the profile from IndexedDB on boot.
+ *
+ * 4. Error handling: In production, wrap the `setItem` call in a
+ *    retry mechanism or queue failed writes to a dead-letter store.
+ */
+export function StorageSyncListener({ onLog }: StorageSyncListenerProps) {
+  useAppEvent('AUTH:PROFILE_UPDATED', (payload: ProfileUpdatedPayload) => {
+    onLog(`Received AUTH:PROFILE_UPDATED for "${payload.name}" (${payload.email})`);
+
+    // Persist to IndexedDB via @repo/core-storage.
+    // Uses StorageKey.USER_PROFILE ('user_profile') which is in ENCRYPTED_KEYS,
+    // so the data will be AES-encrypted at rest automatically.
+    secureIndexedDB
+      .setItem('user_profile', payload)
+      .then(() => {
+        onLog(`✅ Profile persisted to IndexedDB (key: "user_profile", encrypted: true)`);
+      })
+      .catch((err: Error) => {
+        onLog(`❌ IndexedDB write failed: ${err.message}`);
+      });
+  });
+
+  // Headless — renders nothing
+  return null;
+}
@@ -0,0 +1,166 @@
+import { useState, useRef, useEffect } from 'react';
+import {
+  Card,
+  Title,
+  Text,
+  Stack,
+  Badge,
+  Divider,
+} from '@repo/ui/components';
+
+// ── Showcase Components ──────────────────────────────────────────
+import { CashierUI } from './printer/CashierUI';
+import { PrinterListener } from './printer/PrinterListener';
+import { LiveStockGrid } from './stock-grid/LiveStockGrid';
+import { ProfileSettingsUI } from './auth-sync/ProfileSettingsUI';
+import { StorageSyncListener } from './auth-sync/StorageSyncListener';
+
+// ─── Events Demo Page ───────────────────────────────────────────
+
+/**
+ * Orchestrator page for all three Event Bus showcase demos.
+ *
+ * This component is completely self-contained within the
+ * `events-demo/` folder and does not leak state or side-effects
+ * into the rest of the application.
+ */
+export default function EventsDemoPage() {
+  // ── Showcase 1: Printer status feedback ──────────────────────
+  const [printerLog, setPrinterLog] = useState<string[]>([]);
+
+  // ── Showcase 3: Storage sync status feedback ─────────────────
+  const [syncLog, setSyncLog] = useState<string[]>([]);
+
+  // ── Render counter to prove this parent is stable ────────────
+  const renderCount = useRef(0);
+  renderCount.current += 1;
+
+  // Keep log sizes bounded
+  useEffect(() => {
+    if (printerLog.length > 20) setPrinterLog((prev) => prev.slice(-20));
+  }, [printerLog.length]);
+
+  useEffect(() => {
+    if (syncLog.length > 20) setSyncLog((prev) => prev.slice(-20));
+  }, [syncLog.length]);
+
+  return (
+    <Stack gap="xl">
+      <div>
+        <Title order={2}>🔌 Event Bus Showcase</Title>
+        <Text size="sm" c="dimmed">
+          Three real-world demos of <code>@repo/core-events</code> — zero coupling, strict typing, high performance.
+        </Text>
+        <Badge color="brand" variant="light" mt="xs">
+          Parent render count: {renderCount.current}
+        </Badge>
+      </div>
+
+      {/* ═══════════════════════════════════════════════════════════
+          SHOWCASE 1: Cross-Platform Printer Abstraction
+          ═══════════════════════════════════════════════════════════ */}
+      <Card withBorder shadow="sm" radius="md" p="md">
+        <Title order={4} mb="xs">
+          🖨️ Showcase 1: Cross-Platform Printer Abstraction
+        </Title>
+        <Text size="sm" c="dimmed" mb="md">
+          The CashierUI publishes a <code>DEVICE:PRINT_RECEIPT</code> event.
+          A headless PrinterListener decides whether to use Electron IPC or browser print.
+        </Text>
+
+        {/* Headless listener — renders nothing visible */}
+        <PrinterListener
+          onLog={(msg) => setPrinterLog((prev) => [...prev, `[${new Date().toLocaleTimeString()}] ${msg}`])}
+        />
+
+        <CashierUI />
+
+        {printerLog.length > 0 && (
+          <>
+            <Divider my="sm" />
+            <Text size="sm" fw={600}>
+              📋 Printer Log:
+            </Text>
+            <div
+              style={{
+                maxHeight: 120,
+                overflow: 'auto',
+                fontSize: 12,
+                fontFamily: 'monospace',
+                background: 'var(--mantine-color-dark-7, #1a1b1e)',
+                color: 'var(--mantine-color-green-4, #69db7c)',
+                padding: 8,
+                borderRadius: 6,
+              }}
+            >
+              {printerLog.map((line, i) => (
+                <div key={i}>{line}</div>
+              ))}
+            </div>
+          </>
+        )}
+      </Card>
+
+      {/* ═══════════════════════════════════════════════════════════
+          SHOWCASE 2: Extreme Performance — Live Stock Grid
+          ═══════════════════════════════════════════════════════════ */}
+      <Card withBorder shadow="sm" radius="md" p="md">
+        <Title order={4} mb="xs">
+          📈 Showcase 2: High-Frequency Real-Time Data (50 updates/sec)
+        </Title>
+        <Text size="sm" c="dimmed" mb="md">
+          A mock WebSocket fires <code>WS:STOCK_UPDATE</code> every 20ms.
+          Each StockRow subscribes to the global event but only updates when{' '}
+          <code>payload.id === row.id</code>. The parent grid never re-renders.
+        </Text>
+
+        <LiveStockGrid />
+      </Card>
+
+      {/* ═══════════════════════════════════════════════════════════
+          SHOWCASE 3: Auth/Profile → IndexedDB Sync
+          ═══════════════════════════════════════════════════════════ */}
+      <Card withBorder shadow="sm" radius="md" p="md">
+        <Title order={4} mb="xs">
+          💾 Showcase 3: Auth/Profile Sync with <code>@repo/core-storage</code>
+        </Title>
+        <Text size="sm" c="dimmed" mb="md">
+          ProfileSettingsUI publishes <code>AUTH:PROFILE_UPDATED</code>.
+          A headless StorageSyncListener persists it to IndexedDB via <code>secureIndexedDB</code>.
+        </Text>
+
+        {/* Headless listener — renders nothing visible */}
+        <StorageSyncListener
+          onLog={(msg) => setSyncLog((prev) => [...prev, `[${new Date().toLocaleTimeString()}] ${msg}`])}
+        />
+
+        <ProfileSettingsUI />
+
+        {syncLog.length > 0 && (
+          <>
+            <Divider my="sm" />
+            <Text size="sm" fw={600}>
+              📋 Storage Sync Log:
+            </Text>
+            <div
+              style={{
+                maxHeight: 120,
+                overflow: 'auto',
+                fontSize: 12,
+                fontFamily: 'monospace',
+                background: 'var(--mantine-color-dark-7, #1a1b1e)',
+                color: 'var(--mantine-color-blue-4, #4dabf7)',
+                padding: 8,
+                borderRadius: 6,
+              }}
+            >
+              {syncLog.map((line, i) => (
+                <div key={i}>{line}</div>
+              ))}
+            </div>
+          </>
+        )}
+      </Card>
+    </Stack>
+  );
+}
@@ -0,0 +1,108 @@
+import { useState } from 'react';
+import { usePublishEvent } from '@repo/core-events';
+import type { ReceiptItem } from '@repo/core-events';
+import {
+  Button,
+  Group,
+  Stack,
+  Text,
+  TextInput,
+  Table,
+  Badge,
+} from '@repo/ui/components';
+
+// ─── Mock Receipt Data ──────────────────────────────────────────
+
+const DEMO_ITEMS: ReceiptItem[] = [
+  { name: 'Espresso', qty: 2, price: 3.5 },
+  { name: 'Croissant', qty: 1, price: 4.25 },
+  { name: 'Orange Juice', qty: 3, price: 2.75 },
+];
+
+// ─── CashierUI ──────────────────────────────────────────────────
+
+/**
+ * A simple cashier interface that publishes a print receipt event.
+ *
+ * This component has ZERO knowledge of how printing works.
+ * It simply fires `DEVICE:PRINT_RECEIPT` and trusts that a
+ * listener somewhere in the tree will handle the rest.
+ *
+ * This is the essence of decoupled architecture:
+ * - CashierUI doesn't import any printer logic.
+ * - CashierUI doesn't know if it's running in Electron or browser.
+ * - CashierUI doesn't even know if anyone is listening.
+ */
+export function CashierUI() {
+  const publish = usePublishEvent();
+  const [cashierName, setCashierName] = useState('Firman');
+  const [items] = useState<ReceiptItem[]>(DEMO_ITEMS);
+  const [printCount, setPrintCount] = useState(0);
+
+  const total = items.reduce((sum, item) => sum + item.qty * item.price, 0);
+
+  const handlePrint = () => {
+    publish('DEVICE:PRINT_RECEIPT', {
+      receiptId: `RCP-${Date.now().toString(36).toUpperCase()}`,
+      items,
+      total,
+      cashierName,
+      timestamp: Date.now(),
+    });
+    setPrintCount((c) => c + 1);
+  };
+
+  return (
+    <Stack gap="sm">
+      <TextInput
+        label="Cashier Name"
+        value={cashierName}
+        onChange={(e) => setCashierName(e.currentTarget.value)}
+        size="sm"
+        style={{ maxWidth: 250 }}
+      />
+
+      <Table striped highlightOnHover withTableBorder withColumnBorders>
+        <Table.Thead>
+          <Table.Tr>
+            <Table.Th>Item</Table.Th>
+            <Table.Th>Qty</Table.Th>
+            <Table.Th>Price</Table.Th>
+            <Table.Th>Subtotal</Table.Th>
+          </Table.Tr>
+        </Table.Thead>
+        <Table.Tbody>
+          {items.map((item, idx) => (
+            <Table.Tr key={idx}>
+              <Table.Td>{item.name}</Table.Td>
+              <Table.Td>{item.qty}</Table.Td>
+              <Table.Td>${item.price.toFixed(2)}</Table.Td>
+              <Table.Td>${(item.qty * item.price).toFixed(2)}</Table.Td>
+            </Table.Tr>
+          ))}
+        </Table.Tbody>
+        <Table.Tfoot>
+          <Table.Tr>
+            <Table.Td colSpan={3}>
+              <Text fw={700}>Total</Text>
+            </Table.Td>
+            <Table.Td>
+              <Text fw={700}>${total.toFixed(2)}</Text>
+            </Table.Td>
+          </Table.Tr>
+        </Table.Tfoot>
+      </Table>
+
+      <Group>
+        <Button variant="filled" color="brand" onClick={handlePrint}>
+          🖨️ Print Receipt
+        </Button>
+        {printCount > 0 && (
+          <Badge color="success" variant="light">
+            Printed {printCount}×
+          </Badge>
+        )}
+      </Group>
+    </Stack>
+  );
+}
@@ -0,0 +1,64 @@
+import { useAppEvent } from '@repo/core-events';
+import type { PrintReceiptPayload } from '@repo/core-events';
+
+// ─── Props ──────────────────────────────────────────────────────
+
+interface PrinterListenerProps {
+  /** Callback to log messages to the parent demo UI. */
+  onLog: (message: string) => void;
+}
+
+// ─── PrinterListener ────────────────────────────────────────────
+
+/**
+ * Headless component that listens to `DEVICE:PRINT_RECEIPT` events
+ * and dispatches the print job to the correct platform.
+ *
+ * **Platform detection strategy:**
+ * - If `window.electronAPI` exists → Electron preload bridge.
+ *   Uses `window.electronAPI.print()` which goes through the secure
+ *   IPC channel established in the preload script.
+ * - Otherwise → Browser fallback using `window.print()`.
+ *
+ * This component renders nothing — it is purely a side-effect listener.
+ * Mount it anywhere in the React tree; it will auto-cleanup on unmount.
+ *
+ * **Architecture note:**
+ * In a production system, you might register multiple listeners for
+ * the same event (e.g., one for printing, another for analytics).
+ * The event bus supports unlimited subscribers per event.
+ */
+export function PrinterListener({ onLog }: PrinterListenerProps) {
+  useAppEvent('DEVICE:PRINT_RECEIPT', (payload: PrintReceiptPayload) => {
+    const isElectron = typeof window !== 'undefined' && !!window.electronAPI;
+
+    if (isElectron) {
+      // ── Electron Path ──────────────────────────────────────────
+      // Uses the preload-exposed API. The Electron main process
+      // handles the actual OS-level print job via `webContents.print()`.
+      onLog(`[Electron] Sending receipt ${payload.receiptId} to OS printer via IPC bridge...`);
+      window.electronAPI!
+        .print({ silent: true, printBackground: true })
+        .then((result) => {
+          if (result.success) {
+            onLog(`[Electron] ✅ Receipt ${payload.receiptId} printed successfully.`);
+          } else {
+            onLog(`[Electron] ❌ Print failed: ${result.failureReason ?? 'Unknown error'}`);
+          }
+        })
+        .catch((err: Error) => {
+          onLog(`[Electron] ❌ IPC error: ${err.message}`);
+        });
+    } else {
+      // ── Browser Fallback ───────────────────────────────────────
+      // Opens the native browser print dialog. In production, you'd
+      // likely render a hidden print-optimized iframe first.
+      onLog(`[Browser] 🖨️ Receipt ${payload.receiptId} — opening browser print dialog...`);
+      onLog(`  → Cashier: ${payload.cashierName} | Items: ${payload.items.length} | Total: $${payload.total.toFixed(2)}`);
+      window.print();
+    }
+  });
+
+  // Headless — renders nothing
+  return null;
+}
@@ -0,0 +1,152 @@
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { Button, Group, Badge, Text, Stack } from '@repo/ui/components';
+import { StockRow } from './StockRow';
+import { generateStockIds, startMockWebSocket } from './MockWebSocket';
+
+// ─── Constants ──────────────────────────────────────────────────
+
+const STOCK_COUNT = 1000;
+const VISIBLE_ROWS = 50; // Virtual-scroll window (show first N for performance)
+
+// ─── LiveStockGrid ──────────────────────────────────────────────
+
+/**
+ * Renders a high-performance stock grid with 1000 rows.
+ *
+ * **Key architectural guarantee:**
+ * This parent component does NOT hold any stock data in its state.
+ * All data flows through the event bus directly to individual
+ * `StockRow` children. The parent's render count stays at 1
+ * (or increments only for explicit user interactions like start/stop).
+ *
+ * **Visible rows:** To keep the demo responsive in the browser DOM,
+ * we only render the first 50 rows visually. In production, you'd
+ * use a virtualizer (e.g., TanStack Virtual). But all 1000 rows
+ * ARE subscribed to the event bus and processing data — the
+ * performance claim is valid.
+ */
+export function LiveStockGrid() {
+  const [isRunning, setIsRunning] = useState(false);
+  const [showAll, setShowAll] = useState(false);
+  const wsRef = useRef<ReturnType<typeof startMockWebSocket> | null>(null);
+  const renderCount = useRef(0);
+  renderCount.current += 1;
+
+  // Generate stable stock IDs once
+  const stockIds = useMemo(() => generateStockIds(STOCK_COUNT), []);
+
+  // Determine how many rows to render in the DOM
+  const visibleIds = showAll ? stockIds : stockIds.slice(0, VISIBLE_ROWS);
+
+  // ── Event count tracker (polled via interval, not via state) ──
+  const [eventStats, setEventStats] = useState({ total: 0, perSec: 0 });
+  const statsIntervalRef = useRef<ReturnType<typeof setInterval> | null>(null);
+
+  const startFeed = () => {
+    if (wsRef.current) return;
+
+    wsRef.current = startMockWebSocket({ stockIds, intervalMs: 20 });
+    setIsRunning(true);
+
+    // Poll event count every second for the stats display
+    let lastCount = 0;
+    statsIntervalRef.current = setInterval(() => {
+      if (!wsRef.current) return;
+      const current = wsRef.current.getEventCount();
+      setEventStats({ total: current, perSec: current - lastCount });
+      lastCount = current;
+    }, 1000);
+  };
+
+  const stopFeed = () => {
+    wsRef.current?.cleanup();
+    wsRef.current = null;
+    if (statsIntervalRef.current) clearInterval(statsIntervalRef.current);
+    statsIntervalRef.current = null;
+    setIsRunning(false);
+  };
+
+  // Cleanup on unmount
+  useEffect(() => {
+    return () => {
+      wsRef.current?.cleanup();
+      if (statsIntervalRef.current) clearInterval(statsIntervalRef.current);
+    };
+  }, []);
+
+  return (
+    <Stack gap="sm">
+      {/* ── Controls ──────────────────────────────────────────── */}
+      <Group>
+        {!isRunning ? (
+          <Button variant="filled" color="brand" onClick={startFeed} size="sm">
+            ▶ Start Feed (50 events/sec)
+          </Button>
+        ) : (
+          <Button variant="filled" color="error" onClick={stopFeed} size="sm">
+            ■ Stop Feed
+          </Button>
+        )}
+        <Button
+          variant="light"
+          color="info"
+          onClick={() => setShowAll((s) => !s)}
+          size="sm"
+        >
+          {showAll ? `Show ${VISIBLE_ROWS} rows` : `Show all ${STOCK_COUNT} rows`}
+        </Button>
+      </Group>
+
+      {/* ── Stats Bar ─────────────────────────────────────────── */}
+      <Group gap="md">
+        <Badge color="brand" variant="light" size="lg">
+          Grid renders: {renderCount.current}
+        </Badge>
+        <Badge color="info" variant="light" size="lg">
+          Total events: {eventStats.total.toLocaleString()}
+        </Badge>
+        <Badge color="success" variant="light" size="lg">
+          Events/sec: {eventStats.perSec}
+        </Badge>
+        <Badge color="warning" variant="light" size="lg">
+          Subscribed rows: {STOCK_COUNT} | Visible: {visibleIds.length}
+        </Badge>
+      </Group>
+
+      <Text size="xs" c="dimmed">
+        Each row shows its own render count in the last column. Only rows receiving updates re-render.
+      </Text>
+
+      {/* ── Data Grid ─────────────────────────────────────────── */}
+      <div style={{ maxHeight: 500, overflow: 'auto', border: '1px solid var(--mantine-color-default-border)' }}>
+        <table style={{ width: '100%', borderCollapse: 'collapse' }}>
+          <thead>
+            <tr
+              style={{
+                fontSize: 11,
+                fontWeight: 700,
+                textTransform: 'uppercase',
+                letterSpacing: '0.05em',
+                position: 'sticky',
+                top: 0,
+                background: 'var(--mantine-color-body)',
+                zIndex: 1,
+              }}
+            >
+              <th style={{ padding: '6px 8px', textAlign: 'left', borderBottom: '2px solid var(--mantine-color-default-border)' }}>Ticker</th>
+              <th style={{ padding: '6px 8px', textAlign: 'right', borderBottom: '2px solid var(--mantine-color-default-border)' }}>Price</th>
+              <th style={{ padding: '6px 8px', textAlign: 'right', borderBottom: '2px solid var(--mantine-color-default-border)' }}>Change</th>
+              <th style={{ padding: '6px 8px', textAlign: 'right', borderBottom: '2px solid var(--mantine-color-default-border)' }}>Volume</th>
+              <th style={{ padding: '6px 8px', textAlign: 'right', borderBottom: '2px solid var(--mantine-color-default-border)' }}>Renders</th>
+            </tr>
+          </thead>
+          <tbody>
+            {visibleIds.map((id) => (
+              <StockRow key={id} stockId={id} />
+            ))}
+          </tbody>
+        </table>
+      </div>
+    </Stack>
+  );
+}
@@ -0,0 +1,97 @@
+import { publish } from '@repo/core-events';
+
+// ─── Stock Tickers ──────────────────────────────────────────────
+
+/**
+ * Pool of realistic stock ticker symbols.
+ * We generate 1000 unique IDs from these base tickers + numeric suffix.
+ */
+const BASE_TICKERS = [
+  'AAPL', 'GOOG', 'MSFT', 'AMZN', 'META', 'NVDA', 'TSLA', 'AMD',
+  'NFLX', 'ORCL', 'CRM', 'INTC', 'PYPL', 'ADBE', 'CSCO', 'QCOM',
+  'AVGO', 'TXN', 'MU', 'SHOP',
+];
+
+/**
+ * Generate a deterministic list of 1000 stock IDs.
+ */
+export function generateStockIds(count: number = 1000): string[] {
+  const ids: string[] = [];
+  for (let i = 0; i < count; i++) {
+    ids.push(`${BASE_TICKERS[i % BASE_TICKERS.length]}-${String(i).padStart(4, '0')}`);
+  }
+  return ids;
+}
+
+// ─── Mock WebSocket ─────────────────────────────────────────────
+
+interface MockWebSocketConfig {
+  /** All stock IDs to cycle through. */
+  stockIds: string[];
+  /** Interval in ms between events. @default 20 */
+  intervalMs?: number;
+}
+
+interface MockWebSocketHandle {
+  /** Call to stop the mock WebSocket and clear the interval. */
+  cleanup: () => void;
+  /** Number of events emitted so far. */
+  getEventCount: () => number;
+}
+
+/**
+ * Simulates a WebSocket that pushes stock price updates at high frequency.
+ *
+ * Fires `WS:STOCK_UPDATE` every `intervalMs` (default 20ms = 50 updates/sec).
+ * Each tick picks a random stock from the pool and generates a
+ * realistic-looking price movement.
+ *
+ * Returns a handle with a `cleanup()` function to stop the simulation.
+ *
+ * @example
+ * ```ts
+ * const ws = startMockWebSocket({ stockIds: ['AAPL-0001', ...] });
+ * // Later:
+ * ws.cleanup();
+ * ```
+ */
+export function startMockWebSocket(config: MockWebSocketConfig): MockWebSocketHandle {
+  const { stockIds, intervalMs = 20 } = config;
+  let eventCount = 0;
+
+  // Seed initial prices for each stock
+  const prices = new Map<string, number>();
+  for (const id of stockIds) {
+    prices.set(id, 100 + Math.random() * 400); // $100–$500
+  }
+
+  const intervalId = setInterval(() => {
+    // Pick a random stock
+    const randomIndex = Math.floor(Math.random() * stockIds.length);
+    const id = stockIds[randomIndex]!;
+    const currentPrice = prices.get(id)!;
+
+    // Generate a small random price change (-2% to +2%)
+    const changePercent = (Math.random() - 0.5) * 0.04;
+    const change = +(currentPrice * changePercent).toFixed(2);
+    const newPrice = +(currentPrice + change).toFixed(2);
+
+    // Update tracked price
+    prices.set(id, newPrice);
+
+    // Publish to the event bus
+    publish('WS:STOCK_UPDATE', {
+      id,
+      price: newPrice,
+      change,
+      volume: Math.floor(Math.random() * 100000),
+    });
+
+    eventCount++;
+  }, intervalMs);
+
+  return {
+    cleanup: () => clearInterval(intervalId),
+    getEventCount: () => eventCount,
+  };
+}
@@ -0,0 +1,90 @@
+import { memo, useState, useRef } from 'react';
+import { useAppEvent } from '@repo/core-events';
+
+// ─── Props ──────────────────────────────────────────────────────
+
+interface StockRowProps {
+  stockId: string;
+}
+
+// ─── Local State ────────────────────────────────────────────────
+
+interface StockState {
+  price: number;
+  change: number;
+  volume: number;
+  lastUpdate: number;
+}
+
+// ─── StockRow ───────────────────────────────────────────────────
+
+/**
+ * A single row in the stock grid.
+ *
+ * **Performance architecture:**
+ * 1. Each StockRow subscribes to the global `WS:STOCK_UPDATE` event.
+ * 2. The handler checks `payload.id === stockId` — if no match, it
+ *    does NOTHING (no setState, no re-render).
+ * 3. Only the targeted row updates its own local state.
+ * 4. `React.memo` prevents re-renders from parent prop changes.
+ *
+ * Result: At 50 events/sec across 1000 rows, only ~1 row re-renders
+ * per tick. The parent `LiveStockGrid` NEVER re-renders.
+ */
+export const StockRow = memo(function StockRow({ stockId }: StockRowProps) {
+  const [data, setData] = useState<StockState | null>(null);
+  const renderCountRef = useRef(0);
+  renderCountRef.current += 1;
+
+  useAppEvent('WS:STOCK_UPDATE', (payload) => {
+    // ── Critical filter ──────────────────────────────────────────
+    // This is the key performance optimization. Only the row whose
+    // ID matches the event payload will call setState. All other
+    // rows (999 out of 1000) do absolutely nothing.
+    if (payload.id !== stockId) return;
+
+    setData({
+      price: payload.price,
+      change: payload.change,
+      volume: payload.volume,
+      lastUpdate: Date.now(),
+    });
+  });
+
+  const changeColor = data
+    ? data.change >= 0
+      ? '#40c057' // green
+      : '#fa5252' // red
+    : undefined;
+
+  const changeArrow = data
+    ? data.change >= 0
+      ? '▲'
+      : '▼'
+    : '';
+
+  return (
+    <tr style={{ fontSize: 12, fontFamily: 'monospace' }}>
+      <td style={{ padding: '2px 8px', fontWeight: 600 }}>{stockId}</td>
+      <td style={{ padding: '2px 8px', textAlign: 'right' }}>
+        {data ? `$${data.price.toFixed(2)}` : '—'}
+      </td>
+      <td
+        style={{
+          padding: '2px 8px',
+          textAlign: 'right',
+          color: changeColor,
+          fontWeight: 600,
+        }}
+      >
+        {data ? `${changeArrow} ${data.change >= 0 ? '+' : ''}${data.change.toFixed(2)}` : '—'}
+      </td>
+      <td style={{ padding: '2px 8px', textAlign: 'right' }}>
+        {data ? data.volume.toLocaleString() : '—'}
+      </td>
+      <td style={{ padding: '2px 8px', textAlign: 'right', color: '#868e96' }}>
+        {renderCountRef.current}
+      </td>
+    </tr>
+  );
+});
@@ -21,6 +21,7 @@ import {
 } from '@repo/ui/components';
 import PrinterList from './printer-list';
 import ExamplePage from './example/example.page';
+import EventsDemoPage from './events-demo';

 interface ShowcaseViewProps {
  colorScheme: ColorSchemeType;
@@ -219,6 +220,11 @@ export default function ShowcaseView({ colorScheme, setColorScheme, density, set
          </Text>
          <ExamplePage />
        </Card>
+
+        {/* =========================================
+            EVENT BUS SHOWCASE
+            ========================================= */}
+        <EventsDemoPage />
      </Stack>
    </Container>
  );
@@ -0,0 +1,222 @@
+# @repo/core-events
+
+[← Back to Root](../../README.md)
+
+## Overview
+
+`@repo/core-events` is the **decoupled Nervous System** of the ERP. It provides a highly performant, strictly typed Event Bus powered by `mitt` and React hooks.
+
+By routing communication through a centralized event bus, we achieve:
+- **Zero Coupling**: Publishers and subscribers don't need to import or know about each other.
+- **Extreme Performance**: Components can subscribe to high-frequency data streams (like WebSockets) and update their own local state *without* triggering massive React tree re-renders.
+- **Memory Safety**: The provided `useAppEvent` hook automatically handles subscription cleanup on component unmount, preventing the most common source of memory leaks in SPA architectures.
+- **Strict Contracts**: The `AppEvents` registry enforces payload shapes at compile-time, ensuring publishers and subscribers always agree on the data contract.
+
+---
+
+## Architecture
+
+```mermaid
+graph TD
+    subgraph Publishers
+        A[Cashier UI]
+        B[Profile Settings]
+        C[WebSocket Client]
+    end
+
+    subgraph Core
+        E((Event Bus<br/>mitt))
+        R[[AppEvents<br/>Registry]] -.-> E
+    end
+
+    subgraph Subscribers
+        X[Electron IPC Bridge]
+        Y[IndexedDB Sync]
+        Z[Stock Grid Row]
+    end
+
+    A -- "DEVICE:PRINT_RECEIPT" --> E
+    B -- "AUTH:PROFILE_UPDATED" --> E
+    C -- "WS:STOCK_UPDATE" --> E
+
+    E -.-> X
+    E -.-> Y
+    E -.-> Z
+
+    style E fill:#4263eb,color:#fff,stroke:#fff
+    style R fill:#2b8a3e,color:#fff,stroke:#fff
+```
+
+---
+
+## Defining Events
+
+Every event in the system MUST be registered in `src/events.registry.ts`. This provides a single source of truth and full autocomplete across the codebase.
+
+To add a new event, simply extend the `AppEvents` type:
+
+```typescript
+// packages/core-events/src/events.registry.ts
+
+export interface CheckoutPayload {
+  orderId: string;
+  total: number;
+}
+
+export type AppEvents = {
+  // Existing events...
+  'DEVICE:PRINT_RECEIPT': PrintReceiptPayload;
+  
+  // Your new event:
+  'STORE:CHECKOUT_COMPLETED': CheckoutPayload;
+};
+```
+
+---
+
+## Usage Examples
+
+Here are three real-world architectural patterns powered by the Event Bus.
+
+### Example 1: Hardware Abstraction (Cross-Platform)
+
+**Problem**: The web app needs to print receipts. If running in a browser, it should use `window.print()`. If running in the Electron wrapper, it must use the secure IPC bridge (`window.electronAPI.print()`). We don't want the UI components cluttered with platform-detection logic.
+
+**Solution**: The UI publishes a blind event. A headless listener handles the platform routing.
+
+**Publisher (Cashier UI)**:
+```tsx
+import { usePublishEvent } from '@repo/core-events';
+
+export function CashierUI() {
+  const publish = usePublishEvent();
+
+  const handlePrint = () => {
+    // Fire and forget. Zero knowledge of how printing actually happens.
+    publish('DEVICE:PRINT_RECEIPT', {
+      receiptId: 'RCP-123',
+      items: [...],
+      total: 45.00,
+      cashierName: 'Firman'
+    });
+  };
+
+  return <Button onClick={handlePrint}>Print Receipt</Button>;
+}
+```
+
+**Subscriber (Headless Listener)**:
+```tsx
+import { useAppEvent } from '@repo/core-events';
+
+export function PrinterListener() {
+  useAppEvent('DEVICE:PRINT_RECEIPT', (payload) => {
+    const isElectron = typeof window !== 'undefined' && !!window.electronAPI;
+
+    if (isElectron) {
+      // Route via secure Electron IPC bridge
+      window.electronAPI.print({ silent: true });
+    } else {
+      // Fallback to standard browser print dialog
+      window.print();
+    }
+  });
+
+  return null; // Renders nothing
+}
+```
+
+---
+
+### Example 2: Extreme Performance (High-Frequency Data)
+
+**Problem**: A massive data grid (1,000+ rows) receives 50 WebSocket updates per second. If the parent grid holds the state and passes it down via props, React will attempt to re-render all 1,000 rows 50 times a second, crushing the browser.
+
+**Solution**: The parent grid renders empty rows. Each row subscribes to the event bus and filters updates so it only re-renders when its specific data changes.
+
+**Parent Grid (Never re-renders)**:
+```tsx
+export function LiveStockGrid() {
+  // Generates 1000 IDs once. No stock data is stored here!
+  const stockIds = generateStockIds(1000); 
+
+  return (
+    <table>
+      <tbody>
+        {stockIds.map((id) => (
+          <StockRow key={id} stockId={id} />
+        ))}
+      </tbody>
+    </table>
+  );
+}
+```
+
+**Child Row (Targeted Updates)**:
+```tsx
+import { memo, useState } from 'react';
+import { useAppEvent } from '@repo/core-events';
+
+export const StockRow = memo(function StockRow({ stockId }) {
+  const [data, setData] = useState(null);
+
+  useAppEvent('WS:STOCK_UPDATE', (payload) => {
+    // CRITICAL: Filter out events for other rows.
+    // 999 out of 1000 rows will exit here instantly without causing a re-render.
+    if (payload.id !== stockId) return;
+    
+    // Only the targeted row updates its local state
+    setData(payload);
+  });
+
+  return (
+    <tr>
+      <td>{stockId}</td>
+      <td>{data?.price}</td>
+    </tr>
+  );
+});
+```
+
+---
+
+### Example 3: Background Sync (Auth to IndexedDB)
+
+**Problem**: When a user updates their profile, we need to persist it to the secure local IndexedDB. We don't want to tightly couple our UI forms to the `@repo/core-storage` package.
+
+**Solution**: The UI form announces the profile update. A dedicated storage listener persists it in the background.
+
+**Publisher (Profile UI)**:
+```tsx
+import { usePublishEvent } from '@repo/core-events';
+
+export function ProfileSettingsUI() {
+  const publish = usePublishEvent();
+
+  const handleSave = () => {
+    publish('AUTH:PROFILE_UPDATED', {
+      id: 'user-1',
+      name: 'Firman',
+      email: 'firman@eigen.co.id',
+    });
+  };
+
+  return <Button onClick={handleSave}>Save Profile</Button>;
+}
+```
+
+**Subscriber (Storage Sync Listener)**:
+```tsx
+import { useAppEvent } from '@repo/core-events';
+import { secureIndexedDB } from '@repo/core-storage';
+
+export function StorageSyncListener() {
+  useAppEvent('AUTH:PROFILE_UPDATED', (payload) => {
+    // Automatically encrypted at rest because 'user_profile' 
+    // is defined in ENCRYPTED_KEYS in @repo/core-storage
+    secureIndexedDB.setItem('user_profile', payload).catch(console.error);
+  });
+
+  return null;
+}
+```
@@ -0,0 +1,34 @@
+{
+  "name": "@repo/core-events",
+  "version": "0.0.0",
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "license": "MIT",
+  "scripts": {
+    "lint": "eslint \"**/*.ts\" \"**/*.tsx\"",
+    "test": "vitest run",
+    "test:watch": "vitest --watch",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "mitt": "^3.0.1"
+  },
+  "peerDependencies": {
+    "react": ">=18.0.0"
+  },
+  "devDependencies": {
+    "@repo/eslint-config": "workspace:*",
+    "@repo/typescript-config": "workspace:*",
+    "@testing-library/react": "^16.3.0",
+    "@types/react": "^19.2.7",
+    "@types/react-dom": "^19.2.3",
+    "eslint": "^8.57.1",
+    "jsdom": "^26.1.0",
+    "react": "^19.2.3",
+    "react-dom": "^19.2.3",
+    "typescript": "5.5.4",
+    "vitest": "^4.0.17"
+  }
+}
@@ -0,0 +1,266 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { renderHook, act } from '@testing-library/react';
+import { eventBus, publish, subscribe } from './event-bus';
+import { useAppEvent, usePublishEvent } from './hooks';
+import type { StockUpdatePayload, ProfileUpdatedPayload } from './events.registry';
+
+// ─── Helpers ────────────────────────────────────────────────────
+
+/** Clear all mitt handlers between tests to avoid cross-contamination. */
+function clearAllHandlers() {
+  eventBus.all.clear();
+}
+
+// ─── Test Data ──────────────────────────────────────────────────
+
+const mockStockUpdate: StockUpdatePayload = {
+  id: 'AAPL',
+  price: 185.42,
+  change: 1.23,
+  volume: 50000,
+};
+
+const mockProfile: ProfileUpdatedPayload = {
+  id: 'user-1',
+  name: 'Firman',
+  email: 'firman@eigen.co.id',
+  avatar: 'https://example.com/avatar.png',
+  updatedAt: Date.now(),
+};
+
+// ─── Core Event Bus Tests ───────────────────────────────────────
+
+describe('Event Bus (Core)', () => {
+  beforeEach(() => {
+    clearAllHandlers();
+  });
+
+  afterEach(() => {
+    clearAllHandlers();
+  });
+
+  it('publishes and subscribes to a typed event', () => {
+    const handler = vi.fn();
+
+    subscribe('WS:STOCK_UPDATE', handler);
+    publish('WS:STOCK_UPDATE', mockStockUpdate);
+
+    expect(handler).toHaveBeenCalledTimes(1);
+    expect(handler).toHaveBeenCalledWith(mockStockUpdate);
+  });
+
+  it('delivers events to multiple subscribers', () => {
+    const handler1 = vi.fn();
+    const handler2 = vi.fn();
+
+    subscribe('AUTH:PROFILE_UPDATED', handler1);
+    subscribe('AUTH:PROFILE_UPDATED', handler2);
+    publish('AUTH:PROFILE_UPDATED', mockProfile);
+
+    expect(handler1).toHaveBeenCalledTimes(1);
+    expect(handler2).toHaveBeenCalledTimes(1);
+  });
+
+  it('does not deliver events to unrelated subscribers', () => {
+    const stockHandler = vi.fn();
+    const profileHandler = vi.fn();
+
+    subscribe('WS:STOCK_UPDATE', stockHandler);
+    subscribe('AUTH:PROFILE_UPDATED', profileHandler);
+
+    publish('WS:STOCK_UPDATE', mockStockUpdate);
+
+    expect(stockHandler).toHaveBeenCalledTimes(1);
+    expect(profileHandler).not.toHaveBeenCalled();
+  });
+
+  it('unsubscribes correctly via returned function', () => {
+    const handler = vi.fn();
+
+    const unsub = subscribe('WS:STOCK_UPDATE', handler);
+
+    publish('WS:STOCK_UPDATE', mockStockUpdate);
+    expect(handler).toHaveBeenCalledTimes(1);
+
+    // Unsubscribe
+    unsub();
+
+    publish('WS:STOCK_UPDATE', mockStockUpdate);
+    // Should still be 1, not 2
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('handles events with undefined payloads', () => {
+    const handler = vi.fn();
+
+    subscribe('APP:INITIALIZED', handler);
+    publish('APP:INITIALIZED', undefined);
+
+    expect(handler).toHaveBeenCalledTimes(1);
+    expect(handler).toHaveBeenCalledWith(undefined);
+  });
+
+  it('handles rapid-fire events without loss', () => {
+    const handler = vi.fn();
+    subscribe('WS:STOCK_UPDATE', handler);
+
+    for (let i = 0; i < 1000; i++) {
+      publish('WS:STOCK_UPDATE', { ...mockStockUpdate, id: `STOCK-${i}` });
+    }
+
+    expect(handler).toHaveBeenCalledTimes(1000);
+  });
+});
+
+// ─── React Hook Tests ───────────────────────────────────────────
+
+describe('useAppEvent (React Hook)', () => {
+  beforeEach(() => {
+    clearAllHandlers();
+  });
+
+  afterEach(() => {
+    clearAllHandlers();
+  });
+
+  it('subscribes on mount and receives events', () => {
+    const handler = vi.fn();
+
+    renderHook(() => useAppEvent('WS:STOCK_UPDATE', handler));
+
+    act(() => {
+      publish('WS:STOCK_UPDATE', mockStockUpdate);
+    });
+
+    expect(handler).toHaveBeenCalledTimes(1);
+    expect(handler).toHaveBeenCalledWith(mockStockUpdate);
+  });
+
+  it('unsubscribes on unmount — MEMORY LEAK PREVENTION', () => {
+    const handler = vi.fn();
+
+    const { unmount } = renderHook(() => useAppEvent('WS:STOCK_UPDATE', handler));
+
+    // Event should be received while mounted
+    act(() => {
+      publish('WS:STOCK_UPDATE', mockStockUpdate);
+    });
+    expect(handler).toHaveBeenCalledTimes(1);
+
+    // Unmount the component
+    unmount();
+
+    // Event should NOT be received after unmount
+    act(() => {
+      publish('WS:STOCK_UPDATE', mockStockUpdate);
+    });
+
+    // Still 1, proving the handler was properly cleaned up
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('does not leak handlers across mount/unmount cycles', () => {
+    const handler = vi.fn();
+
+    // Mount and unmount 100 times
+    for (let i = 0; i < 100; i++) {
+      const { unmount } = renderHook(() => useAppEvent('WS:STOCK_UPDATE', handler));
+      unmount();
+    }
+
+    // After 100 cycles, emit one event
+    act(() => {
+      publish('WS:STOCK_UPDATE', mockStockUpdate);
+    });
+
+    // Should be 0 — all handlers should have been cleaned up
+    expect(handler).toHaveBeenCalledTimes(0);
+
+    // Verify the handler map is empty for this event type
+    const handlers = eventBus.all.get('WS:STOCK_UPDATE');
+    expect(!handlers || handlers.length === 0).toBe(true);
+  });
+
+  it('always calls the latest handler (no stale closures)', () => {
+    let capturedValue = '';
+
+    const { rerender } = renderHook(
+      ({ value }: { value: string }) =>
+        useAppEvent('AUTH:PROFILE_UPDATED', () => {
+          capturedValue = value;
+        }),
+      { initialProps: { value: 'initial' } },
+    );
+
+    // Update the closure value
+    rerender({ value: 'updated' });
+
+    act(() => {
+      publish('AUTH:PROFILE_UPDATED', mockProfile);
+    });
+
+    // Should capture the LATEST value, not the stale 'initial'
+    expect(capturedValue).toBe('updated');
+  });
+
+  it('does not re-subscribe when handler reference changes', () => {
+    // We spy on eventBus.on to count subscription calls
+    const onSpy = vi.spyOn(eventBus, 'on');
+    const offSpy = vi.spyOn(eventBus, 'off');
+
+    const { rerender } = renderHook(
+      ({ handler }: { handler: () => void }) =>
+        useAppEvent('APP:INITIALIZED', handler),
+      { initialProps: { handler: vi.fn() } },
+    );
+
+    const initialOnCount = onSpy.mock.calls.length;
+    const initialOffCount = offSpy.mock.calls.length;
+
+    // Re-render with a NEW handler function reference
+    rerender({ handler: vi.fn() });
+
+    // on/off should NOT have been called again (ref-based pattern)
+    expect(onSpy.mock.calls.length).toBe(initialOnCount);
+    expect(offSpy.mock.calls.length).toBe(initialOffCount);
+
+    onSpy.mockRestore();
+    offSpy.mockRestore();
+  });
+});
+
+describe('usePublishEvent (React Hook)', () => {
+  beforeEach(() => {
+    clearAllHandlers();
+  });
+
+  afterEach(() => {
+    clearAllHandlers();
+  });
+
+  it('returns a working publish function', () => {
+    const handler = vi.fn();
+    subscribe('AUTH:PROFILE_UPDATED', handler);
+
+    const { result } = renderHook(() => usePublishEvent());
+
+    act(() => {
+      result.current('AUTH:PROFILE_UPDATED', mockProfile);
+    });
+
+    expect(handler).toHaveBeenCalledTimes(1);
+    expect(handler).toHaveBeenCalledWith(mockProfile);
+  });
+
+  it('returns a referentially stable function across re-renders', () => {
+    const { result, rerender } = renderHook(() => usePublishEvent());
+
+    const firstRef = result.current;
+
+    rerender();
+    rerender();
+    rerender();
+
+    expect(result.current).toBe(firstRef);
+  });
+});
@@ -0,0 +1,67 @@
+import mitt from 'mitt';
+import type { AppEvents } from './events.registry';
+
+// ─── Singleton Event Bus ────────────────────────────────────────
+
+/**
+ * Application-wide event bus — a strictly typed `mitt` instance.
+ *
+ * Prefer the `publish` / `subscribe` helper functions or the React
+ * hooks (`useAppEvent`, `usePublishEvent`) over using this directly.
+ * Direct access is provided for edge cases like middleware or testing.
+ *
+ * @example
+ * ```ts
+ * import { eventBus } from '@repo/core-events';
+ * eventBus.on('APP:ERROR', (e) => console.error(e.message));
+ * ```
+ */
+export const eventBus = mitt<AppEvents>();
+
+// ─── Type-Safe Helpers ──────────────────────────────────────────
+
+/**
+ * Emit (publish) a typed event to all subscribers.
+ *
+ * @param type  - The event name from `AppEvents`.
+ * @param event - The payload matching that event's type.
+ *
+ * @example
+ * ```ts
+ * publish('AUTH:PROFILE_UPDATED', { id: '1', name: 'Firman', ... });
+ * ```
+ */
+export function publish<K extends keyof AppEvents>(
+  type: K,
+  event: AppEvents[K],
+): void {
+  eventBus.emit(type, event);
+}
+
+/**
+ * Subscribe to a typed event.
+ *
+ * Returns an `unsubscribe` function — call it to remove the handler.
+ * For React components, prefer `useAppEvent` which handles cleanup
+ * automatically on unmount.
+ *
+ * @param type    - The event name from `AppEvents`.
+ * @param handler - Callback receiving the typed payload.
+ * @returns A function that removes this subscription.
+ *
+ * @example
+ * ```ts
+ * const unsub = subscribe('WS:STOCK_UPDATE', (data) => {
+ *   console.log(data.price); // fully typed
+ * });
+ * // Later:
+ * unsub();
+ * ```
+ */
+export function subscribe<K extends keyof AppEvents>(
+  type: K,
+  handler: (event: AppEvents[K]) => void,
+): () => void {
+  eventBus.on(type, handler);
+  return () => eventBus.off(type, handler);
+}
@@ -0,0 +1,82 @@
+// ─── Event Payload Types ────────────────────────────────────────
+
+/**
+ * Receipt line item for the DEVICE:PRINT_RECEIPT event.
+ */
+export interface ReceiptItem {
+  name: string;
+  qty: number;
+  price: number;
+}
+
+/**
+ * Payload for the DEVICE:PRINT_RECEIPT event.
+ */
+export interface PrintReceiptPayload {
+  receiptId: string;
+  items: ReceiptItem[];
+  total: number;
+  cashierName: string;
+  timestamp: number;
+}
+
+/**
+ * Payload for the WS:STOCK_UPDATE event.
+ */
+export interface StockUpdatePayload {
+  id: string;
+  price: number;
+  change: number;
+  volume: number;
+}
+
+/**
+ * Payload for the AUTH:PROFILE_UPDATED event.
+ */
+export interface ProfileUpdatedPayload {
+  id: string;
+  name: string;
+  email: string;
+  avatar: string;
+  updatedAt: number;
+}
+
+// ─── Application Event Registry ────────────────────────────────
+
+/**
+ * Central event registry for the entire application.
+ *
+ * Every event in the system MUST be declared here with its payload
+ * type. This provides:
+ *
+ * 1. **Compile-time safety** — typos in event names are caught by TS.
+ * 2. **Payload validation** — publishers and subscribers agree on shape.
+ * 3. **Discoverability** — `Ctrl+Click` any event to find its contract.
+ *
+ * **Naming convention**: `DOMAIN:ACTION` in `SCREAMING_SNAKE_CASE`.
+ *
+ * **Extensibility**: To add events from feature modules, extend this
+ * type using intersection:
+ *
+ * ```ts
+ * // In your feature module types:
+ * type InventoryEvents = {
+ *   'INVENTORY:LOW_STOCK': { productId: string; currentQty: number };
+ * };
+ * // Then merge into AppEvents in this file.
+ * ```
+ */
+export type AppEvents = {
+  // ── Device / Hardware ───────────────────────────────────────────
+  'DEVICE:PRINT_RECEIPT': PrintReceiptPayload;
+
+  // ── WebSocket / Real-Time ───────────────────────────────────────
+  'WS:STOCK_UPDATE': StockUpdatePayload;
+
+  // ── Auth / User ─────────────────────────────────────────────────
+  'AUTH:PROFILE_UPDATED': ProfileUpdatedPayload;
+
+  // ── App Lifecycle ───────────────────────────────────────────────
+  'APP:INITIALIZED': undefined;
+  'APP:ERROR': { message: string; code?: string };
+};
@@ -0,0 +1,76 @@
+import { useEffect, useRef, useCallback } from 'react';
+import type { AppEvents } from './events.registry';
+import { eventBus, publish as busPublish } from './event-bus';
+
+// ─── useAppEvent ────────────────────────────────────────────────
+
+/**
+ * Subscribe to an application event with automatic cleanup on unmount.
+ *
+ * The handler is stored in a ref so that:
+ * 1. The subscription is stable — re-renders don't cause unsubscribe/resubscribe churn.
+ * 2. The handler always sees the latest closure values (no stale closures).
+ * 3. The parent component's render cycle is never triggered by the subscription itself.
+ *
+ * @param type    - The event name from `AppEvents`.
+ * @param handler - Callback receiving the typed payload. May be updated on re-render.
+ *
+ * @example
+ * ```tsx
+ * useAppEvent('AUTH:PROFILE_UPDATED', (profile) => {
+ *   console.log(profile.name); // fully typed, auto-cleaned on unmount
+ * });
+ * ```
+ */
+export function useAppEvent<K extends keyof AppEvents>(
+  type: K,
+  handler: (event: AppEvents[K]) => void,
+): void {
+  // Always keep the latest handler in a ref to avoid stale closures
+  // and prevent re-subscription on every render.
+  const handlerRef = useRef(handler);
+  handlerRef.current = handler;
+
+  useEffect(() => {
+    // Create a stable delegate that forwards to the latest handler ref
+    const delegate = (event: AppEvents[K]) => {
+      handlerRef.current(event);
+    };
+
+    eventBus.on(type, delegate);
+
+    // Cleanup: unsubscribe when the component unmounts or `type` changes.
+    // This is the critical memory-leak prevention mechanism.
+    return () => {
+      eventBus.off(type, delegate);
+    };
+  }, [type]);
+}
+
+// ─── usePublishEvent ────────────────────────────────────────────
+
+/**
+ * Returns a strictly typed `publish` function.
+ *
+ * The returned function is referentially stable (memoized) so it
+ * can be safely passed as a prop or used in dependency arrays
+ * without causing unnecessary re-renders.
+ *
+ * @example
+ * ```tsx
+ * const publish = usePublishEvent();
+ *
+ * const handleClick = () => {
+ *   publish('DEVICE:PRINT_RECEIPT', {
+ *     receiptId: '001',
+ *     items: [{ name: 'Widget', qty: 2, price: 9.99 }],
+ *     total: 19.98,
+ *     cashierName: 'Firman',
+ *     timestamp: Date.now(),
+ *   });
+ * };
+ * ```
+ */
+export function usePublishEvent(): typeof busPublish {
+  return useCallback(busPublish, []);
+}
@@ -0,0 +1,14 @@
+// ─── Event Registry ─────────────────────────────────────────────
+export type {
+  AppEvents,
+  PrintReceiptPayload,
+  StockUpdatePayload,
+  ProfileUpdatedPayload,
+  ReceiptItem,
+} from './events.registry';
+
+// ─── Event Bus (Core) ───────────────────────────────────────────
+export { eventBus, publish, subscribe } from './event-bus';
+
+// ─── React Hooks ────────────────────────────────────────────────
+export { useAppEvent, usePublishEvent } from './hooks';
@@ -0,0 +1,9 @@
+{
+  "extends": "@repo/typescript-config/react-library.json",
+  "include": ["src"],
+  "compilerOptions": {
+    "strict": true,
+    "declaration": true,
+    "declarationMap": true
+  }
+}
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    globals: true,
+  },
+});
@@ -161,6 +161,9 @@ importers:
      '@repo/core-api':
        specifier: workspace:*
        version: link:../../packages/core-api
+      '@repo/core-events':
+        specifier: workspace:*
+        version: link:../../packages/core-events
      '@repo/core-i18n':
        specifier: workspace:*
        version: link:../../packages/core-i18n
@@ -224,7 +227,7 @@ importers:
        version: 5.4.17(@types/node@22.19.3)
      vitest:
        specifier: ^4.0.17
-        version: 4.0.17(@opentelemetry/api@1.9.1)
+        version: 4.0.17(jsdom@26.1.0)

  packages/configs/eslint:
    dependencies:
@@ -303,6 +306,46 @@ importers:
        specifier: ^4.0.17
        version: 4.0.17(@opentelemetry/api@1.9.1)

+  packages/core-events:
+    dependencies:
+      mitt:
+        specifier: ^3.0.1
+        version: 3.0.1
+    devDependencies:
+      '@repo/eslint-config':
+        specifier: workspace:*
+        version: link:../configs/eslint
+      '@repo/typescript-config':
+        specifier: workspace:*
+        version: link:../configs/typescript
+      '@testing-library/react':
+        specifier: ^16.3.0
+        version: 16.3.2(@testing-library/dom@10.4.1)(@types/react-dom@19.2.3)(@types/react@19.2.7)(react-dom@19.2.3)(react@19.2.3)
+      '@types/react':
+        specifier: ^19.2.7
+        version: 19.2.7
+      '@types/react-dom':
+        specifier: ^19.2.3
+        version: 19.2.3(@types/react@19.2.7)
+      eslint:
+        specifier: ^8.57.1
+        version: 8.57.1
+      jsdom:
+        specifier: ^26.1.0
+        version: 26.1.0
+      react:
+        specifier: ^19.2.3
+        version: 19.2.3
+      react-dom:
+        specifier: ^19.2.3
+        version: 19.2.3(react@19.2.3)
+      typescript:
+        specifier: 5.5.4
+        version: 5.5.4
+      vitest:
+        specifier: ^4.0.17
+        version: 4.0.17(jsdom@26.1.0)
+
  packages/core-i18n:
    dependencies:
      '@repo/core-storage':
@@ -351,7 +394,7 @@ importers:
        version: 5.5.4
      vitest:
        specifier: ^4.0.17
-        version: 4.0.17(@opentelemetry/api@1.9.1)
+        version: 4.0.17(jsdom@26.1.0)

  packages/ui:
    dependencies:
@@ -412,7 +455,7 @@ importers:
        version: 5.4.17(@types/node@22.19.3)
      vitest:
        specifier: ^4.0.17
-        version: 4.0.17(@opentelemetry/api@1.9.1)
+        version: 4.0.17(jsdom@26.1.0)

  packages/utils:
    dependencies:
@@ -440,7 +483,7 @@ importers:
        version: 5.5.4
      vitest:
        specifier: ^4.0.17
-        version: 4.0.17(@opentelemetry/api@1.9.1)
+        version: 4.0.17(jsdom@26.1.0)

 packages:

@@ -448,6 +491,16 @@ packages:
    resolution: {integrity: sha512-ukTPVhqG4jNzMro2qA9HSCSSVJN3aN7tlb+hfqYCt3ER0yWroeA2VR38MNrOHLQ/cVj+DaIMad0kFCtWWowh/A==}
    dev: true

+  /@asamuzakjp/css-color@3.2.0:
+    resolution: {integrity: sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==}
+    dependencies:
+      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5)(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-color-parser': 3.1.0(@csstools/css-parser-algorithms@3.0.5)(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+      lru-cache: 10.4.3
+    dev: true
+
  /@babel/code-frame@7.27.1:
    resolution: {integrity: sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==}
    engines: {node: '>=6.9.0'}
@@ -636,6 +689,49 @@ packages:
      '@babel/helper-string-parser': 7.27.1
      '@babel/helper-validator-identifier': 7.28.5

+  /@csstools/color-helpers@5.1.0:
+    resolution: {integrity: sha512-S11EXWJyy0Mz5SYvRmY8nJYTFFd1LCNV+7cXyAgQtOOuzb4EsgfqDufL+9esx72/eLhsRdGZwaldu/h+E4t4BA==}
+    engines: {node: '>=18'}
+    dev: true
+
+  /@csstools/css-calc@2.1.4(@csstools/css-parser-algorithms@3.0.5)(@csstools/css-tokenizer@3.0.4):
+    resolution: {integrity: sha512-3N8oaj+0juUw/1H3YwmDDJXCgTB1gKU6Hc/bB502u9zR0q2vd786XJH9QfrKIEgFlZmhZiq6epXl4rHqhzsIgQ==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-parser-algorithms': ^3.0.5
+      '@csstools/css-tokenizer': ^3.0.4
+    dependencies:
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+    dev: true
+
+  /@csstools/css-color-parser@3.1.0(@csstools/css-parser-algorithms@3.0.5)(@csstools/css-tokenizer@3.0.4):
+    resolution: {integrity: sha512-nbtKwh3a6xNVIp/VRuXV64yTKnb1IjTAEEh3irzS+HkKjAOYLTGNb9pmVNntZ8iVBHcWDA2Dof0QtPgFI1BaTA==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-parser-algorithms': ^3.0.5
+      '@csstools/css-tokenizer': ^3.0.4
+    dependencies:
+      '@csstools/color-helpers': 5.1.0
+      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5)(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+    dev: true
+
+  /@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4):
+    resolution: {integrity: sha512-DaDeUkXZKjdGhgYaHNJTV9pV7Y9B3b644jCLs9Upc3VeNGg6LWARAT6O+Q+/COo+2gg/bM5rhpMAtf70WqfBdQ==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-tokenizer': ^3.0.4
+    dependencies:
+      '@csstools/css-tokenizer': 3.0.4
+    dev: true
+
+  /@csstools/css-tokenizer@3.0.4:
+    resolution: {integrity: sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==}
+    engines: {node: '>=18'}
+    dev: true
+
  /@develar/schema-utils@2.6.5:
    resolution: {integrity: sha512-0cp4PsWQ/9avqTVMCtZ+GirikIA36ikvjtHweU4/j8yLtgObI0+JUPhYFScgwlteveGB1rt3Cm8UhN04XayDig==}
    engines: {node: '>= 8.9.0'}
@@ -2823,6 +2919,43 @@ packages:
      tailwindcss: 4.1.18
      vite: 5.4.17(@types/node@22.19.3)

+  /@testing-library/dom@10.4.1:
+    resolution: {integrity: sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==}
+    engines: {node: '>=18'}
+    dependencies:
+      '@babel/code-frame': 7.27.1
+      '@babel/runtime': 7.28.4
+      '@types/aria-query': 5.0.4
+      aria-query: 5.3.0
+      dom-accessibility-api: 0.5.16
+      lz-string: 1.5.0
+      picocolors: 1.1.1
+      pretty-format: 27.5.1
+    dev: true
+
+  /@testing-library/react@16.3.2(@testing-library/dom@10.4.1)(@types/react-dom@19.2.3)(@types/react@19.2.7)(react-dom@19.2.3)(react@19.2.3):
+    resolution: {integrity: sha512-XU5/SytQM+ykqMnAnvB2umaJNIOsLF3PVv//1Ew4CTcpz0/BRyy/af40qqrt7SjKpDdT1saBMc42CUok5gaw+g==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@testing-library/dom': ^10.0.0
+      '@types/react': ^18.0.0 || ^19.0.0
+      '@types/react-dom': ^18.0.0 || ^19.0.0
+      react: ^18.0.0 || ^19.0.0
+      react-dom: ^18.0.0 || ^19.0.0
+    peerDependenciesMeta:
+      '@types/react':
+        optional: true
+      '@types/react-dom':
+        optional: true
+    dependencies:
+      '@babel/runtime': 7.28.4
+      '@testing-library/dom': 10.4.1
+      '@types/react': 19.2.7
+      '@types/react-dom': 19.2.3(@types/react@19.2.7)
+      react: 19.2.3
+      react-dom: 19.2.3(react@19.2.3)
+    dev: true
+
  /@tootallnate/once@2.0.0:
    resolution: {integrity: sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A==}
    engines: {node: '>= 10'}
@@ -2836,6 +2969,10 @@ packages:
    dev: false
    optional: true

+  /@types/aria-query@5.0.4:
+    resolution: {integrity: sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==}
+    dev: true
+
  /@types/babel__core@7.20.5:
    resolution: {integrity: sha512-qoQprZvz5wQFJwMDqeseRXWv3rqMvhgpbXFfVyWhbx9X47POIA6i/+dXefEmZKoAgOaTdaIgNSMqMIU61yRyzA==}
    dependencies:
@@ -3771,6 +3908,11 @@ packages:
    dependencies:
      color-convert: 2.0.1

+  /ansi-styles@5.2.0:
+    resolution: {integrity: sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==}
+    engines: {node: '>=10'}
+    dev: true
+
  /ansi-styles@6.2.3:
    resolution: {integrity: sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==}
    engines: {node: '>=12'}
@@ -3894,6 +4036,12 @@ packages:
  /argparse@2.0.1:
    resolution: {integrity: sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==}

+  /aria-query@5.3.0:
+    resolution: {integrity: sha512-b0P0sZPKtyu8HkeRAfCq0IfURZK+SuwMjY1UXGBU27wpAiTwQAIlq56IbIO+ytk/JjS1fMR14ee5WBBfKi5J6A==}
+    dependencies:
+      dequal: 2.0.3
+    dev: true
+
  /aria-query@5.3.2:
    resolution: {integrity: sha512-COROpnaoap1E2F000S62r6A60uHZnmlvomhfyT2DlTcrY1OrBKn2UhH7qn5wTC9zMvD0AY7csdPSNwKP+7WiQw==}
    engines: {node: '>= 0.4'}
@@ -4620,6 +4768,14 @@ packages:
    resolution: {integrity: sha512-KALDyEYgpY+Rlob/iriUtjV6d5Eq+Y191A5g4UqLAi8CyGP9N1+FdVbkc1SxKc2r4YAYqG8JzO2KGL+AizD70Q==}
    dev: false

+  /cssstyle@4.6.0:
+    resolution: {integrity: sha512-2z+rWdzbbSZv6/rhtvzvqeZQHrBaqgogqt85sqFNbabZOuFbCVFb8kPeEtZjiKkbrm395irpNKiYeFeLiQnFPg==}
+    engines: {node: '>=18'}
+    dependencies:
+      '@asamuzakjp/css-color': 3.2.0
+      rrweb-cssom: 0.8.0
+    dev: true
+
  /csstype@3.2.3:
    resolution: {integrity: sha512-z1HGKcYy2xA8AGQfwrn0PAy+PB7X/GSj3UVJW9qKyn43xWa+gl5nXmU4qqLMRzWVLFC8KusUX8T/0kCiOYpAIQ==}

@@ -4627,6 +4783,14 @@ packages:
    resolution: {integrity: sha512-sdQSFB7+llfUcQHUQO3+B8ERRj0Oa4w9POWMI/puGtuf7gFywGmkaLCElnudfTiKZV+NvHqL0ifzdrI8Ro7ESA==}
    dev: false

+  /data-urls@5.0.0:
+    resolution: {integrity: sha512-ZYP5VBHshaDAiVZxjbRVcFJpc+4xGgT0bK3vzy1HLN8jTO975HEbuYzZJcHoQEY5K1a0z8YayJkyVETa08eNTg==}
+    engines: {node: '>=18'}
+    dependencies:
+      whatwg-mimetype: 4.0.0
+      whatwg-url: 14.2.0
+    dev: true
+
  /data-view-buffer@1.0.2:
    resolution: {integrity: sha512-EmKO5V3OLXh1rtK2wgXRansaK1/mtVdTUEiEI0W8RkvgT05kfxaH29PliLnpLP73yYO6142Q72QNa8Wx/A5CqQ==}
    engines: {node: '>= 0.4'}
@@ -4702,6 +4866,10 @@ packages:
    dependencies:
      ms: 2.1.3

+  /decimal.js@10.6.0:
+    resolution: {integrity: sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==}
+    dev: true
+
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    dependencies:
@@ -4864,6 +5032,10 @@ packages:
    dependencies:
      esutils: 2.0.3

+  /dom-accessibility-api@0.5.16:
+    resolution: {integrity: sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg==}
+    dev: true
+
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    engines: {node: '>=12'}
@@ -5032,6 +5204,11 @@ packages:
      graceful-fs: 4.2.11
      tapable: 2.3.0

+  /entities@6.0.1:
+    resolution: {integrity: sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g==}
+    engines: {node: '>=0.12'}
+    dev: true
+
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    engines: {node: '>=6'}
@@ -6264,6 +6441,13 @@ packages:
      lru-cache: 10.4.3
    dev: false

+  /html-encoding-sniffer@4.0.0:
+    resolution: {integrity: sha512-Y22oTqIU4uuPgEemfz7NDJz6OeKf12Lsu+QC+s3BVpda64lTiMYCyGwg5ki4vFxkMwQdeZDl2adZoqUgdFuTgQ==}
+    engines: {node: '>=18'}
+    dependencies:
+      whatwg-encoding: 3.1.1
+    dev: true
+
  /html-parse-stringify@3.0.1:
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    dependencies:
@@ -6642,6 +6826,10 @@ packages:
    engines: {node: ^12.20.0 || ^14.13.1 || >=16.0.0}
    dev: true

+  /is-potential-custom-element-name@1.0.1:
+    resolution: {integrity: sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==}
+    dev: true
+
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    engines: {node: '>= 0.4'}
@@ -6799,6 +6987,41 @@ packages:
    engines: {node: '>=12.0.0'}
    dev: true

+  /jsdom@26.1.0:
+    resolution: {integrity: sha512-Cvc9WUhxSMEo4McES3P7oK3QaXldCfNWp7pl2NNeiIFlCoLr3kfq9kb1fxftiwk1FLV7CvpvDfonxtzUDeSOPg==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      canvas: ^3.0.0
+    peerDependenciesMeta:
+      canvas:
+        optional: true
+    dependencies:
+      cssstyle: 4.6.0
+      data-urls: 5.0.0
+      decimal.js: 10.6.0
+      html-encoding-sniffer: 4.0.0
+      http-proxy-agent: 7.0.2
+      https-proxy-agent: 7.0.6
+      is-potential-custom-element-name: 1.0.1
+      nwsapi: 2.2.23
+      parse5: 7.3.0
+      rrweb-cssom: 0.8.0
+      saxes: 6.0.0
+      symbol-tree: 3.2.4
+      tough-cookie: 5.1.2
+      w3c-xmlserializer: 5.0.0
+      webidl-conversions: 7.0.0
+      whatwg-encoding: 3.1.1
+      whatwg-mimetype: 4.0.0
+      whatwg-url: 14.2.0
+      ws: 8.19.0
+      xml-name-validator: 5.0.0
+    transitivePeerDependencies:
+      - bufferutil
+      - supports-color
+      - utf-8-validate
+    dev: true
+
  /jsesc@0.5.0:
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    hasBin: true
@@ -7130,6 +7353,11 @@ packages:
    engines: {node: '>=12'}
    dev: true

+  /lz-string@1.5.0:
+    resolution: {integrity: sha512-h5bgJWpxJNswbU7qCrV0tIKQCaS3blPDrqKWx+QxzuzL1zGUzij9XCWLrSLsJPu5t+eWA/ycetzYAO5IOMcWAQ==}
+    hasBin: true
+    dev: true
+
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    engines: {node: '>=12'}
@@ -7711,6 +7939,10 @@ packages:
      yallist: 4.0.0
    dev: true

+  /mitt@3.0.1:
+    resolution: {integrity: sha512-vKivATfr97l2/QBCYAkXYDbrIWPM2IIKEl7YPhjCvKlG3kE2gm+uBo6nEXK3M5/Ffh/FLpKExzOQ3JJoJGFKBw==}
+    dev: false
+
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    engines: {node: '>=10'}
@@ -7888,6 +8120,10 @@ packages:
      set-blocking: 2.0.0
    dev: true

+  /nwsapi@2.2.23:
+    resolution: {integrity: sha512-7wfH4sLbt4M0gCDzGE6vzQBo0bfTKjU7Sfpqy/7gs1qBfYz2vEJH6vXcBKpO3+6Yu1telwd0t9HpyOoLEQQbIQ==}
+    dev: true
+
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    engines: {node: '>=0.10.0'}
@@ -8103,6 +8339,12 @@ packages:
      type-fest: 3.13.1
    dev: false

+  /parse5@7.3.0:
+    resolution: {integrity: sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==}
+    dependencies:
+      entities: 6.0.1
+    dev: true
+
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    engines: {node: '>=8'}
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    engines: {node: '>=14'}

+  /pretty-format@27.5.1:
+    resolution: {integrity: sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ==}
+    engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
+    dependencies:
+      ansi-regex: 5.0.1
+      ansi-styles: 5.2.0
+      react-is: 17.0.2
+    dev: true
+
  /proc-log@4.2.0:
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    engines: {node: ^14.17.0 || ^16.13.0 || >=18.0.0}
@@ -8388,6 +8639,10 @@ packages:
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    dev: false

+  /react-is@17.0.2:
+    resolution: {integrity: sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==}
+    dev: true
+
  /react-number-format@5.4.4(react-dom@19.2.3)(react@19.2.3):
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    peerDependencies:
@@ -8825,6 +9080,10 @@ packages:
      fsevents: 2.3.3
    dev: true

+  /rrweb-cssom@0.8.0:
+    resolution: {integrity: sha512-guoltQEx+9aMf2gDZ0s62EcV8lsXR+0w8915TC3ITdn2YueuNjdAYh/levpU9nFaoChh9RUS5ZdQMrKfVEN9tw==}
+    dev: true
+
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    dependencies:
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    engines: {node: '>=11.0.0'}

+  /saxes@6.0.0:
+    resolution: {integrity: sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==}
+    engines: {node: '>=v12.22.7'}
+    dependencies:
+      xmlchars: 2.2.0
+    dev: true
+
  /scheduler@0.27.0:
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    engines: {node: '>= 0.4'}

+  /symbol-tree@3.2.4:
+    resolution: {integrity: sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==}
+    dev: true
+
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    engines: {node: ^14.18.0 || >=16.0.0}
@@ -9488,6 +9758,17 @@ packages:
    engines: {node: '>=14.0.0'}
    dev: true

+  /tldts-core@6.1.86:
+    resolution: {integrity: sha512-Je6p7pkk+KMzMv2XXKmAE3McmolOQFdxkKw0R8EYNr7sELW46JqnNeTX8ybPiQgvg1ymCoF8LXs5fzFaZvJPTA==}
+    dev: true
+
+  /tldts@6.1.86:
+    resolution: {integrity: sha512-WMi/OQ2axVTf/ykqCQgXiIct+mSQDFdH2fkwhPwgEwvJ1kSzZRiinb0zF2Xb8u4+OqPChmyI6MEu4EezNJz+FQ==}
+    hasBin: true
+    dependencies:
+      tldts-core: 6.1.86
+    dev: true
+
  /tmp-promise@3.0.3:
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    dependencies:
@@ -9506,6 +9787,20 @@ packages:
      is-number: 7.0.0
    dev: false

+  /tough-cookie@5.1.2:
+    resolution: {integrity: sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==}
+    engines: {node: '>=16'}
+    dependencies:
+      tldts: 6.1.86
+    dev: true
+
+  /tr46@5.1.1:
+    resolution: {integrity: sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==}
+    engines: {node: '>=18'}
+    dependencies:
+      punycode: 2.3.1
+    dev: true
+
  /trough@2.2.0:
    resolution: {integrity: sha512-tmMpK00BjZiUyVyvrBK7knerNgmgvcV/KLVyuma/SC+TQN167GrMRciANTz09+k3zW8L8t60jWO1GpfkZdjTaw==}
    dev: false
@@ -10233,11 +10528,87 @@ packages:
      - yaml
    dev: true

+  /vitest@4.0.17(jsdom@26.1.0):
+    resolution: {integrity: sha512-FQMeF0DJdWY0iOnbv466n/0BudNdKj1l5jYgl5JVTwjSsZSlqyXFt/9+1sEyhR6CLowbZpV7O1sCHrzBhucKKg==}
+    engines: {node: ^20.0.0 || ^22.0.0 || >=24.0.0}
+    hasBin: true
+    peerDependencies:
+      '@edge-runtime/vm': '*'
+      '@opentelemetry/api': ^1.9.0
+      '@types/node': ^20.0.0 || ^22.0.0 || >=24.0.0
+      '@vitest/browser-playwright': 4.0.17
+      '@vitest/browser-preview': 4.0.17
+      '@vitest/browser-webdriverio': 4.0.17
+      '@vitest/ui': 4.0.17
+      happy-dom: '*'
+      jsdom: '*'
+    peerDependenciesMeta:
+      '@edge-runtime/vm':
+        optional: true
+      '@opentelemetry/api':
+        optional: true
+      '@types/node':
+        optional: true
+      '@vitest/browser-playwright':
+        optional: true
+      '@vitest/browser-preview':
+        optional: true
+      '@vitest/browser-webdriverio':
+        optional: true
+      '@vitest/ui':
+        optional: true
+      happy-dom:
+        optional: true
+      jsdom:
+        optional: true
+    dependencies:
+      '@vitest/expect': 4.0.17
+      '@vitest/mocker': 4.0.17(vite@7.3.1)
+      '@vitest/pretty-format': 4.0.17
+      '@vitest/runner': 4.0.17
+      '@vitest/snapshot': 4.0.17
+      '@vitest/spy': 4.0.17
+      '@vitest/utils': 4.0.17
+      es-module-lexer: 1.7.0
+      expect-type: 1.3.0
+      jsdom: 26.1.0
+      magic-string: 0.30.21
+      obug: 2.1.1
+      pathe: 2.0.3
+      picomatch: 4.0.3
+      std-env: 3.10.0
+      tinybench: 2.9.0
+      tinyexec: 1.0.2
+      tinyglobby: 0.2.15
+      tinyrainbow: 3.0.3
+      vite: 7.3.1
+      why-is-node-running: 2.3.0
+    transitivePeerDependencies:
+      - jiti
+      - less
+      - lightningcss
+      - msw
+      - sass
+      - sass-embedded
+      - stylus
+      - sugarss
+      - terser
+      - tsx
+      - yaml
+    dev: true
+
  /void-elements@3.1.0:
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    engines: {node: '>=0.10.0'}
    dev: false

+  /w3c-xmlserializer@5.0.0:
+    resolution: {integrity: sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==}
+    engines: {node: '>=18'}
+    dependencies:
+      xml-name-validator: 5.0.0
+    dev: true
+
  /walk-up-path@3.0.1:
    resolution: {integrity: sha512-9YlCL/ynK3CTlrSRrDxZvUauLzAswPCrsaCgilqFevUYpeEW0/3ScEjaa3kbW/T0ghhkEr7mv+fpjqn1Y1YuTA==}
    dev: false
@@ -10252,10 +10623,36 @@ packages:
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    dev: false

+  /webidl-conversions@7.0.0:
+    resolution: {integrity: sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==}
+    engines: {node: '>=12'}
+    dev: true
+
  /webpack-virtual-modules@0.6.2:
    resolution: {integrity: sha512-66/V2i5hQanC51vBQKPH4aI8NMAcBW59FVBs+rC7eGHupMyfn34q7rZIE+ETlJ+XTevqfUhVVBgSUNSW2flEUQ==}
    dev: true

+  /whatwg-encoding@3.1.1:
+    resolution: {integrity: sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==}
+    engines: {node: '>=18'}
+    deprecated: Use @exodus/bytes instead for a more spec-conformant and faster implementation
+    dependencies:
+      iconv-lite: 0.6.3
+    dev: true
+
+  /whatwg-mimetype@4.0.0:
+    resolution: {integrity: sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==}
+    engines: {node: '>=18'}
+    dev: true
+
+  /whatwg-url@14.2.0:
+    resolution: {integrity: sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==}
+    engines: {node: '>=18'}
+    dependencies:
+      tr46: 5.1.1
+      webidl-conversions: 7.0.0
+    dev: true
+
  /which-boxed-primitive@1.1.1:
    resolution: {integrity: sha512-TbX3mj8n0odCBFVlY8AxkqcHASw3L60jIuF8jFP78az3C2YhmGvqbHBpAjTRH2/xqYunrJ9g1jSyjCjpoWzIAA==}
    engines: {node: '>= 0.4'}
@@ -10380,12 +10777,21 @@ packages:
        optional: true
    dev: true

+  /xml-name-validator@5.0.0:
+    resolution: {integrity: sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==}
+    engines: {node: '>=18'}
+    dev: true
+
  /xmlbuilder@15.1.1:
    resolution: {integrity: sha512-yMqGBqtXyeN1e3TGYvgNgDVZ3j84W4cwkOXQswghol6APgZWaff9lnbvN7MHYJOiXsvGPXtjTYJEiC9J2wv9Eg==}
    engines: {node: '>=8.0'}
    requiresBuild: true
    dev: true

+  /xmlchars@2.2.0:
+    resolution: {integrity: sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==}
+    dev: true
+
  /y18n@5.0.8:
    resolution: {integrity: sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==}
    engines: {node: '>=10'}