### Install Auto-Thread Plugin

Source: https://github.com/grammyjs/auto-thread/blob/main/README.md

Installs the @grammyjs/auto-thread plugin directly from its GitHub repository using npm. This is the recommended installation method as the plugin may not have been officially released.

```sh
npm install github:grammyjs/auto-thread
```

--------------------------------

### Configure AutoThread with Custom Context in Grammy.js

Source: https://context7.com/grammyjs/auto-thread/llms.txt

This example shows how to integrate the `autoThread` middleware with a custom grammY context type. By passing the custom context type as a generic parameter to `autoThread`, you ensure type safety across your middleware chain, allowing for extended context functionalities like session management.

```typescript
import { Bot, Context, SessionFlavor } from "grammy";
import { autoThread } from "@grammyjs/auto-thread";

// Define custom session data
interface SessionData {
  messageCount: number;
  lastTopic?: number;
}

// Create custom context type
type MyContext = Context & SessionFlavor<SessionData>;

// Create bot with custom context
const bot = new Bot<MyContext>("YOUR_BOT_TOKEN");

// Use autoThread with custom context type
bot.use(autoThread<MyContext>());

// Session middleware (example)
bot.use((ctx, next) => {
  ctx.session = { messageCount: 0 };
  return next();
});

bot.on("message", async (ctx) => {
  ctx.session.messageCount++;
  ctx.session.lastTopic = ctx.msg?.message_thread_id;

  // Auto-thread handles the thread ID automatically
  await ctx.reply(`Message #${ctx.session.messageCount} in this session`);
});

bot.start();
```

--------------------------------

### Deno Usage: Import and Use Auto Thread Plugin

Source: https://context7.com/grammyjs/auto-thread/llms.txt

Demonstrates how to import and use the Auto Thread plugin in a Deno environment. It shows bot initialization, middleware registration, and handling messages within forum topics.

```typescript
import {
  Bot
} from "https://deno.land/x/grammy/mod.ts";
import {
  autoThread
} from "https://raw.githubusercontent.com/grammyjs/auto-thread/main/src/mod.ts";

const bot = new Bot(Deno.env.get("BOT_TOKEN")!);

// Register middleware
bot.use(autoThread());

// Handle messages in forum topics
bot.command("ping", (ctx) => ctx.reply("Pong! (sent to correct thread)"));

bot.on("message:photo", async (ctx) => {
  // Reply with a document - goes to the same thread
  await ctx.api.sendMessage(ctx.chat.id, "Nice photo! Here's a response.");
});

bot.start();
```

--------------------------------

### Define and Use Router Middleware (TypeScript)

Source: https://github.com/grammyjs/auto-thread/blob/main/src/README.md

This snippet demonstrates how to create a Router instance, define routes with associated middleware, and register the router with the bot. It shows how to specify a routing function to determine which middleware to execute and how to handle cases where no specific route matches.

```typescript
import { Bot, Context } from 'grammy';
import { Router } from '@grammyjs/router';

// Define a custom context type if needed
interface MyContext extends Context {
  // Add custom properties here
}

const bot = new Bot<MyContext>('YOUR_BOT_TOKEN');

// Create a router instance, optionally with a custom context type
const router = new Router<MyContext>(ctx => {
  // Determine the route key based on the context
  // For example, you could inspect ctx.message.text
  if (ctx.message?.text.startsWith('/start')) {
    return 'start';
  } else if (ctx.message?.text.startsWith('/help')) {
    return 'help';
  }
  return 'fallback'; // Default route if none match
});

// Define middleware for specific routes
router.route('start', async ctx => {
  await ctx.reply('Welcome! This is the start route.');
});

router.route('help', async ctx => {
  await ctx.reply('This is the help route. How can I assist you?');
});

// Define a fallback middleware for unmatched routes
router.otherwise(async ctx => {
  await ctx.reply('Sorry, I did not understand that command.');
});

// Use the router middleware with the bot
bot.use(router);

// Start the bot
bot.start();

```

--------------------------------

### Initialize and Use AutoThread Middleware in Grammy.js

Source: https://context7.com/grammyjs/auto-thread/llms.txt

This snippet demonstrates how to set up the `autoThread` middleware for a grammY bot. It ensures that all subsequent API calls, including sending messages and media, automatically include the correct `message_thread_id` when the original message originates from a forum topic. This middleware should be registered before other middleware to function correctly.

```typescript
import { Bot } from "grammy";
import { autoThread } from "@grammyjs/auto-thread";

// Create your bot instance
const bot = new Bot("YOUR_BOT_TOKEN");

// Register the autoThread middleware - must be registered before other middleware
bot.use(autoThread());

// Now all replies automatically go to the correct topic thread
bot.command("start", async (ctx) => {
  // This will automatically reply in the same forum topic
  // No need to manually specify message_thread_id
  await ctx.reply("Welcome! This message goes to the right topic automatically.");
});

bot.on("message:text", async (ctx) => {
  // Even ctx.api.sendMessage calls are handled
  await ctx.api.sendMessage(ctx.chat.id, "This also goes to the correct thread!");

  // Send media - thread ID is automatically added
  await ctx.api.sendPhoto(ctx.chat.id, "https://example.com/photo.jpg");
});

// Works with forwarding and copying messages too
bot.command("forward", async (ctx) => {
  if (ctx.message.reply_to_message) {
    await ctx.api.forwardMessage(
      ctx.chat.id,
      ctx.chat.id,
      ctx.message.reply_to_message.message_id
    );
  }
});

// Start the bot
bot.start();
```

--------------------------------

### Use Auto-Thread Plugin with Grammy.js Bot

Source: https://github.com/grammyjs/auto-thread/blob/main/README.md

Integrates the auto-thread plugin into a Grammy.js bot application. This enables automatic reply threading for messages sent via `ctx.api.sendMessage`.

```ts
import { autoThread } from "@grammyjs/auto-thread";

bot.use(autoThread());
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.