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feat: chat room react example
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‎examples/chat-room-react/.gitignore‎

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.actorcore
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node_modules
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# React
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build/

‎examples/chat-room-react/actors/app.ts‎

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import { actor, setup } from "actor-core";
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export type Message = { sender: string; text: string; timestamp: number; }
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export const chatRoom = actor({
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// State is automatically persisted
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state: {
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messages: [] as Message[]
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},
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actions: {
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sendMessage: (c, sender: string, text: string) => {
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const message = { sender, text, timestamp: Date.now() };
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// Any changes to state are automatically saved
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c.state.messages.push(message);
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// Broadcast events trigger real-time updates in connected clients
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c.broadcast("newMessage", message);
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},
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getHistory: (c) => c.state.messages
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}
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});
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// Create and export the app
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export const app = setup({
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actors: { chatRoom },
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});
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// Export type for client type checking
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export type App = typeof app;

‎examples/chat-room-react/package.json‎

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{
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"name": "chat-room-react",
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"version": "0.8.0",
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"private": true,
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"type": "module",
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"main": "src/index.ts",
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"scripts": {
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"dev:actor": "npx @actor-core/cli@latest dev actors/app.ts",
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"dev:frontend": "react-scripts start",
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"build": "react-scripts build",
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"check-types": "tsc --noEmit",
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"test": "vitest run"
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},
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"dependencies": {
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"@actor-core/react": "workspace:*",
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"@types/react": "^19",
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"@types/react-dom": "^19",
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"actor-core": "workspace:*",
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"react": "^19",
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"react-dom": "^19",
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"react-scripts": "^5.0.1"
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},
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"devDependencies": {
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"@actor-core/cli": "workspace:*",
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"actor-core": "workspace:*",
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"typescript": "^5.5.2"
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},
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"example": {
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"platforms": [
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"*"
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]
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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},
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"resolutions": {
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"react@^19": "^19.0.0",
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"react-dom@^19": "^19.0.0",
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"react@^18": "^18.3",
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"hono": "^4.7.0"
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}
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}

‎examples/chat-room-react/public/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<meta name="theme-color" content="#000000">
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<title>Chat Room</title>
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</head>
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<body>
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<noscript>
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You need to enable JavaScript to run this app.
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</noscript>
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<div id="root"></div>
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<link rel="stylesheet" href="./main.css">
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</body>
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</html>

‎examples/chat-room-react/public/main.css‎

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body {
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margin: 0;
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padding: 20px;
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
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background-color: #f5f5f5;
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}
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.chat-container {
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max-width: 800px;
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margin: 0 auto;
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background: white;
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border-radius: 12px;
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box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
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display: flex;
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flex-direction: column;
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height: 80vh;
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}
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.room-header {
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padding: 20px;
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border-bottom: 1px solid #eee;
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}
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.room-header h3 {
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margin: 0;
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color: #333;
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}
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.messages {
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flex: 1;
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overflow-y: auto;
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padding: 20px;
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}
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.message {
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margin-bottom: 15px;
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padding: 10px;
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background: #f8f9fa;
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border-radius: 8px;
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position: relative;
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}
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.message b {
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color: #2c5282;
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margin-right: 8px;
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}
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.timestamp {
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font-size: 0.8em;
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color: #666;
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position: absolute;
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right: 10px;
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top: 10px;
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}
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.empty-message {
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text-align: center;
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color: #666;
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padding: 20px;
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font-style: italic;
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}
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.input-area {
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padding: 20px;
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border-top: 1px solid #eee;
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display: flex;
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gap: 10px;
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}
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.input-area input {
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flex: 1;
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padding: 12px;
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border: 1px solid #ddd;
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border-radius: 6px;
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font-size: 16px;
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outline: none;
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transition: border-color 0.2s;
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}
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.input-area input:focus {
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border-color: #4299e1;
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}
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.input-area button {
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padding: 12px 24px;
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background: #4299e1;
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color: white;
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border: none;
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border-radius: 6px;
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font-size: 16px;
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cursor: pointer;
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transition: background-color 0.2s;
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}
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.input-area button:hover {
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background: #3182ce;
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}
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.input-area button:active {
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background: #2b6cb0;
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}

‎examples/chat-room-react/src/App.tsx‎

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import { createClient } from "actor-core/client";
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import { createReactActorCore } from "@actor-core/react";
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import { useState, useEffect } from "react";
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import type { App, Message } from "../actors/app";
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const client = createClient<App>("http://localhost:6420");
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const { useActor, useActorEvent } = createReactActorCore(client);
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export default function ChatRoom({ roomId = "general" }) {
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// Connect to specific chat room using tags
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const [{ actor }] = useActor("chatRoom", {
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tags: { roomId }
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});
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const [messages, setMessages] = useState<Message[]>([]);
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const [input, setInput] = useState("");
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// Load initial state
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useEffect(() => {
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if (actor) {
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// Load chat history
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actor.getHistory().then(setMessages);
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}
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}, [actor]);
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// Listen for real-time updates from the server
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useActorEvent({ actor, event: "newMessage" }, (message) => {
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setMessages(prev => [...prev, message as Message]);
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});
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const sendMessage = () => {
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if (actor && input.trim()) {
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actor.sendMessage("User", input);
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setInput("");
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}
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};
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return (
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<div className="chat-container">
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<div className="room-header">
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<h3>Chat Room: {roomId}</h3>
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</div>
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<div className="messages">
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{messages.length === 0 ? (
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<div className="empty-message">No messages yet. Start the conversation!</div>
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) : (
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messages.map((msg, i) => (
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<div key={i} className="message">
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<b>{msg.sender}:</b> {msg.text}
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<span className="timestamp">
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{new Date(msg.timestamp).toLocaleTimeString()}
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</span>
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</div>
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))
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)}
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</div>
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<div className="input-area">
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<input
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value={input}
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onChange={e => setInput(e.target.value)}
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onKeyDown={e => e.key === "Enter" && sendMessage()}
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placeholder="Type a message..."
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/>
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<button onClick={sendMessage}>Send</button>
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</div>
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</div>
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);
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}

‎examples/chat-room-react/src/index.tsx‎

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import ReactDOM from "react-dom/client";
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import ChatRoom from "./App";
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const container = document.getElementById('root')!;
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const root = ReactDOM.createRoot(container);
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root.render(<ChatRoom />);

‎examples/chat-room-react/tsconfig.json‎

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{
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"compilerOptions": {
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/* Visit https://aka.ms/tsconfig.json to read more about this file */
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/* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
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"target": "esnext",
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/* Specify a set of bundled library declaration files that describe the target runtime environment. */
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"lib": ["ESNext", "DOM"],
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/* Specify what JSX code is generated. */
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"jsx": "react-jsx",
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/* Specify what module code is generated. */
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"module": "esnext",
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/* Specify how TypeScript looks up a file from a given module specifier. */
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"moduleResolution": "bundler",
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/* Specify type package names to be included without being referenced in a source file. */
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"types": ["node"],
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/* Enable importing .json files */
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"resolveJsonModule": true,
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/* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
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"allowJs": true,
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/* Enable error reporting in type-checked JavaScript files. */
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"checkJs": false,
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/* Disable emitting files from a compilation. */
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"noEmit": true,
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/* Ensure that each file can be safely transpiled without relying on other imports. */
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"isolatedModules": true,
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/* Allow 'import x from y' when a module doesn't have a default export. */
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"allowSyntheticDefaultImports": true,
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/* Ensure that casing is correct in imports. */
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"forceConsistentCasingInFileNames": true,
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/* Enable all strict type-checking options. */
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"strict": true,
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/* Skip type checking all .d.ts files. */
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"skipLibCheck": true
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},
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"include": ["src/**/*", "actors/**/*", "tests/**/*"]
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}

‎package.json‎

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"zx": "^8.3.2"
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},
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"resolutions": {
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"react@^19": "^19.0.0",
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"react-dom@^19": "^19.0.0",
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"react@^18": "^18.3",
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"react": "^19.1.0",
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"react-dom": "^19.1.0",
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"hono": "^4.7.0"
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},
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"dependencies": {

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