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* HMRClient - Orchestrates WebSocket connection and HMR updates
*
* Integrates all HMR modules (cleanup tracker, state capturer, error overlay,
* connection indicator) to provide seamless hot module replacement with
* state preservation.
*
* @module @coherent.js/client/hmr/client
*/
import { cleanupTracker } from './cleanup-tracker.js';
import { stateCapturer } from './state-capturer.js';
import { errorOverlay } from './overlay.js';
import { connectionIndicator } from './indicator.js';
import { moduleTracker } from './module-tracker.js';
/**
* Parse error stack to extract file/line info
*
* @param {Error} error - Error object
* @returns {{ file: string|null, line: number|null, column: number|null }} Parsed location
*/
function parseErrorLocation(error) {
const result = { file: null, line: null, column: null };
if (!error.stack) {
return result;
}
// Match common stack trace formats:
// Chrome/Node: "at Function (file.js:10:5)"
// Firefox: "Function@file.js:10:5"
// Safari: "file.js:10:5"
const patterns = [
/at\s+.*?\((.+?):(\d+):(\d+)\)/, // Chrome/Node with parens
/at\s+(.+?):(\d+):(\d+)/, // Chrome/Node without parens
/@(.+?):(\d+):(\d+)/, // Firefox
/^(.+?):(\d+):(\d+)/, // Safari
];
const lines = error.stack.split('\n');
for (const line of lines) {
for (const pattern of patterns) {
const match = line.match(pattern);
if (match) {
result.file = match[1];
result.line = parseInt(match[2], 10);
result.column = parseInt(match[3], 10);
return result;
}
}
}
return result;
}
/**
* HMR Client class - manages WebSocket connection and update orchestration
*/
export class HMRClient {
constructor() {
/**
* WebSocket connection
* @type {WebSocket|null}
*/
this.socket = null;
/**
* Connection state
* @type {boolean}
*/
this.connected = false;
/**
* Reconnection attempt counter
* @type {number}
*/
this.reconnectAttempts = 0;
/**
* Maximum reconnection attempts
* @type {number}
*/
this.maxReconnectAttempts = 10;
/**
* Base reconnection delay in ms
* @type {number}
*/
this.reconnectDelay = 1000;
/**
* Whether we've had a disconnect (for reload detection)
* @type {boolean}
*/
this.hadDisconnect = false;
/**
* Reconnect timeout ID
* @type {number|null}
*/
this.reconnectTimeout = null;
/**
* Initialization flag
* @type {boolean}
*/
this.initialized = false;
}
/**
* Connect to the dev server WebSocket
*
* Establishes WebSocket connection with automatic reconnection using
* exponential backoff with jitter.
*
* @returns {void}
*/
connect() {
if (typeof window === 'undefined') {
return;
}
// Clear any pending reconnect
if (this.reconnectTimeout !== null) {
clearTimeout(this.reconnectTimeout);
this.reconnectTimeout = null;
}
try {
const protocol = location.protocol === 'https:' ? 'wss' : 'ws';
const wsUrl = `${protocol}://${location.host}`;
this.socket = new WebSocket(wsUrl);
// Share socket with module tracker for invalidation messages
moduleTracker.setSocket(this.socket);
this.socket.addEventListener('open', () => {
console.log('[HMR] Connected');
this.connected = true;
this.reconnectAttempts = 0;
connectionIndicator.update('connected');
// Send connection acknowledgment
this.socket.send(JSON.stringify({ type: 'connected' }));
// If reconnecting after disconnect, reload (server may have restarted)
if (this.hadDisconnect) {
console.log('[HMR] Reconnected after disconnect, reloading page');
setTimeout(() => location.reload(), 200);
return;
}
});
this.socket.addEventListener('close', () => {
this.connected = false;
this.hadDisconnect = true;
connectionIndicator.update('disconnected');
moduleTracker.setSocket(null);
this.scheduleReconnect();
});
this.socket.addEventListener('error', (event) => {
console.warn('[HMR] WebSocket error:', event);
connectionIndicator.update('error');
try {
this.socket.close();
} catch {
// Ignore close errors
}
});
this.socket.addEventListener('message', (event) => {
this.handleMessage(event);
});
} catch (error) {
console.warn('[HMR] Failed to connect:', error);
this.scheduleReconnect();
}
}
/**
* Schedule a reconnection attempt with exponential backoff
*
* @private
*/
scheduleReconnect() {
if (this.reconnectAttempts >= this.maxReconnectAttempts) {
console.warn('[HMR] Max reconnection attempts reached');
connectionIndicator.update('disconnected');
return;
}
connectionIndicator.update('reconnecting');
// Exponential backoff with jitter
const delay = Math.min(
this.reconnectDelay * Math.pow(2, this.reconnectAttempts) + Math.random() * 1000,
30000
);
this.reconnectAttempts++;
console.log(`[HMR] Reconnecting in ${Math.round(delay)}ms (attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})`);
this.reconnectTimeout = setTimeout(() => {
this.reconnectTimeout = null;
this.connect();
}, delay);
}
/**
* Handle incoming WebSocket message
*
* @param {MessageEvent} event - WebSocket message event
* @private
*/
handleMessage(event) {
let data;
try {
data = JSON.parse(event.data);
} catch {
return;
}
console.log('[HMR] message', data.type, data.filePath || data.webPath || '');
switch (data.type) {
case 'connected':
// Connection acknowledged
break;
case 'hmr-full-reload':
case 'reload':
console.warn('[HMR] Server requested full reload');
location.reload();
break;
case 'hmr-component-update':
case 'hmr-update':
this.handleUpdate(data);
break;
case 'hmr-error':
this.showError(data.error || data);
break;
case 'preview-update':
// No-op: used by dashboard for live preview panes
break;
default:
// Unknown message type, ignore
break;
}
}
/**
* Handle module update
*
* Orchestrates the full HMR update cycle:
* 1. Capture form/scroll state
* 2. Execute dispose handlers
* 3. Clean up module resources
* 4. Re-import module
* 5. Execute accept handlers
* 6. Restore state
*
* @param {Object} data - Update message data
* @param {string} [data.filePath] - File path that changed
* @param {string} [data.webPath] - Web-accessible path
* @param {string} [data.updateType] - Type of update (component, style, etc.)
*/
async handleUpdate(data) {
const filePath = data.webPath || data.filePath || '';
const moduleId = filePath;
try {
// 1. Capture current state
stateCapturer.captureAll();
// 2. Execute dispose handler if registered
if (moduleTracker.hasModule(moduleId)) {
moduleTracker.executeDispose(moduleId);
}
// 3. Clean up module resources
if (cleanupTracker.hasResources(moduleId)) {
cleanupTracker.checkForLeaks(moduleId);
cleanupTracker.cleanup(moduleId);
}
// 4. Re-import module with cache bust
const importPath = filePath.startsWith('/') ? filePath : `/${filePath}`;
const newModule = await import(`${importPath}?t=${Date.now()}`);
// 5. Execute accept handler if module can hot-update
const accepted = moduleTracker.canHotUpdate(moduleId);
if (accepted) {
moduleTracker.executeAccept(moduleId, newModule);
} else {
// Fall back to autoHydrate for components without explicit accept
await this.fallbackHydrate();
}
// 6. Restore state
stateCapturer.restoreAll();
// 7. Hide error overlay (in case previous error is now fixed)
errorOverlay.hide();
// 8. Log success
console.log(`[HMR] Updated: ${data.updateType || 'module'} ${filePath}`);
} catch (error) {
this.handleUpdateError(error, filePath);
}
}
/**
* Fall back to autoHydrate for non-HMR-aware modules
*
* @private
*/
async fallbackHydrate() {
try {
// Try to import autoHydrate from the hydration module
const { autoHydrate } = await import('../hydration.js');
// If examples register a component registry on window, prefer targeted hydrate
if (typeof window !== 'undefined' && window.componentRegistry) {
autoHydrate(window.componentRegistry);
} else {
autoHydrate();
}
} catch {
// autoHydrate not available or failed
console.warn('[HMR] autoHydrate not available, component may need manual refresh');
}
}
/**
* Handle update error
*
* @param {Error} error - Error that occurred
* @param {string} filePath - File that was being updated
* @private
*/
handleUpdateError(error, filePath) {
console.error('[HMR] Update failed:', error);
// Parse error location from stack
const location = parseErrorLocation(error);
// Build error details for overlay
const errorDetails = {
message: error.message || 'Unknown error during HMR update',
file: location.file || filePath,
line: location.line,
column: location.column,
stack: error.stack,
};
this.showError(errorDetails);
}
/**
* Show error overlay
*
* @param {Object} error - Error details
*/
showError(error) {
errorOverlay.show(error);
}
/**
* Hide error overlay
*/
hideError() {
errorOverlay.hide();
}
/**
* Initialize HMR client
*
* Guards against double initialization and connects to dev server.
*
* @returns {void}
*/
initialize() {
if (typeof window === 'undefined') {
return;
}
// Guard against double initialization
if (window.__coherent_hmr_initialized || this.initialized) {
return;
}
window.__coherent_hmr_initialized = true;
this.initialized = true;
this.connect();
}
/**
* Disconnect and clean up
*
* @returns {void}
*/
disconnect() {
if (this.reconnectTimeout !== null) {
clearTimeout(this.reconnectTimeout);
this.reconnectTimeout = null;
}
if (this.socket) {
try {
this.socket.close();
} catch {
// Ignore close errors
}
this.socket = null;
}
this.connected = false;
moduleTracker.setSocket(null);
connectionIndicator.destroy();
}
/**
* Check if client is connected
*
* @returns {boolean} True if connected
*/
isConnected() {
return this.connected;
}
}
/**
* Singleton HMR client instance
* @type {HMRClient}
*/
export const hmrClient = new HMRClient();
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