@mastondzn/dank-twitch-irc

This package is a fork of robotty/dank-twitch-irc, with additional code from fmalk/dank-twitch-irc, amazeful/amazeful-twitch-irc and kararty/dank-twitch-irc.

Node.js-only Twitch IRC lib, written in TypeScript.

Requires Node.js 18 or above.

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Usage

import { ChatClient } from "@mastondzn/dank-twitch-irc";

const chat = new ChatClient();
chat.on("ready", () => console.log("Successfully connected to chat"));
chat.on("close", (error) => {
  if (error != null) {
    console.error("Client closed due to error", error);
  }
});
chat.on("PRIVMSG", (msg) => {
  console.log(`[#${msg.channelName}] ${msg.displayName}: ${msg.messageText}`);
});
// See below for more events
chat.connect();
chat.join("forsen");

Available client events

• chat.on("connecting", () => { /* ... */ }): Called when the client starts connecting for the first time.

• chat.on("connect", () => { /* ... */ }): Called when the client connects for the first time. This is called when the transport layer connections (e.g. TCP or WebSocket connection is established), not when login to IRC succeeds.

• chat.on("ready", () => { /* ... */ }): Called when the client becomes ready for the first time (login to the chat server is successful.)

• chat.on("close", (error?: Error) => { /* ... */ }): Called when the client is terminated as a whole. Not called for individual connections that were disconnected. Can be caused for example by a invalid OAuth token (failure to login), or when chat.close() or chat.destroy() was called. error is only non-null if the client was closed by a call to chat.close().

• chat.on("error", (error: Error?) => { /* ... */ }): Called when any error occurs on the client, including non-fatal errors such as a message that could not be delivered due to an error.

• chat.on("rawCommand", (cmd: string) => { /* ... */ }): Called when any command is executed by the client.

• chat.on("message", (message: IRCMessage) => { /* ... */ }): Called on every incoming message. If the message is a message that is further parsed (I called these "twitch messages" in this library) then the message passed to this handler will already be the specific type, e.g. PrivmsgMessage if the command is PRIVMSG.

• chat.on("PRIVMSG", (message: PrivmsgMessage) => { /* ... */ }): Called on incoming messages whose command is PRIVMSG. The message parameter is always instanceof PrivmsgMessage. (See the API documentation for what properties exist on all PrivmsgMessage instances)

  For example:

  chat.on("CLEARCHAT", (msg) => {
    if (msg.isTimeout()) {
      console.log(
        `${msg.targetUsername} just got timed out for ` +
          `${msg.banDuration} seconds in channel ${msg.channelName}`,
      );
    }
  });

  Other message types that have specific message parsing are:

  • CLEARCHAT (maps to ClearchatMessage) - Timeout and ban messages
  • CLEARMSG (maps to ClearmsgMessage) - Single message deletions (initiated by /delete)
  • HOSTTARGET (maps to HosttargetMessage) - A channel entering or exiting host mode.
  • NOTICE (maps to NoticeMessage) - Various notices, such as when you /help, a command fails, the error response when you are timed out, etc.
  • PRIVMSG (maps to PrivmsgMessage) - Normal chat messages
  • ROOMSTATE (maps to RoomstateMessage) - A change to a channel's followers mode, subscribers-only mode, r9k mode, followers mode, slow mode etc.
  • USERNOTICE (maps to UsernoticeMessage) - Subs, resubs, sub gifts, rituals, raids, etc. - See more details about how to handle this message type below.
  • USERSTATE (maps to UserstateMessage) - Your own state (e.g. badges, color, display name, emote sets, mod status), sent on every time you join a channel or send a PRIVMSG to a channel
  • GLOBALUSERSTATE (maps to GlobaluserstateMessage) - Logged in user's "global state", sent once on every login (Note that due to the used connection pool you can receive this multiple times during your bot's runtime)
  • WHISPER (maps to WhisperMessage) - Somebody else whispering you
  • JOIN (maps to JoinMessage) - You yourself joining a channel, of if you have requestMembershipCapability enabled, also other users joining channels you are joined to.
  • PART (maps to JoinMessage) - You yourself parting (leaving) a channel, of if you have requestMembershipCapability enabled, also other users parting channels you are joined to.
  • RECONNECT (maps to ReconnectMessage) - When the twitch server tells a client to reconnect and re-join channels (You don't have to listen for this yourself, this is done automatically already)
  • PING (maps to PingMessage) - When the twitch server sends a ping, expecting a pong back from the client to verify if the connection is still alive. (You don't have to listen for this yourself, the client automatically responds for you)
  • PONG (maps to PongMessage) - When the twitch server responds to our PING requests (The library automatically sends a PING request every 30 seconds to verify connections are alive)
  • CAP (maps to CapMessage) - Message type received once during connection startup, acknowledging requested capabilities.

All other commands (if they don't have a special parsed type like the ones listed above) will still be emitted under their command name as an IRCMessage, e.g.:

// :tmi.twitch.tv 372 botfactory :You are in a maze of twisty passages, all alike.
// msg will be an instance of IRCMessage
chat.on("372", (msg) => console.log(`Server MOTD is: ${msg.ircParameters[1]}`));

Handling USERNOTICE messages

The USERNOTICE message type is special because it encapsulates a wide range of events, including:

• Subs
• Resubs
• Gift subscription
• Incoming raid and
• Channel rituals,

which are all emitted under the USERNOTICE event. See also the offical documentation about the USERNOTICE command.

Every USERNOTICE message is sent by a user, and always contains a msg.systemMessage (This is a message that twitch formats for you, e.g. 4 raiders from PotehtoO have joined! for a raid message.) Additionally, every USERNOTICE message can have a message that is additionally sent/shared from the sending user, for example the "share this message with the streamer" message sent with resubs and subs. If no message is sent by the user, msg.messageText is undefined.

dank-twitch-irc currently does not have special parsing code for each USERNOTICE messageTypeID (e.g. sub, resub, raid, etc...) - Instead the parser assigns all msg-param- tags to the msg.eventParams object. See below on what msg.eventParams are available for each of the messageTypeIDs.

Sub and resub

When a user subscribes or resubscribes with his own money/prime (this is NOT sent for gift subs, see below)

chat.on("USERNOTICE", (msg) => {
  // sub and resub messages have the same parameters, so we can handle them both the same way
  if (!msg.isSub() && !msg.isResub()) {
    return;
  }
  /*
   * msg.eventParams are:
   *
   * {
   *   "cumulativeMonths": 10,
   *   "cumulativeMonthsRaw": "10",
   *   "subPlan": "1000", // Prime, 1000, 2000 or 3000
   *   "subPlanName": "The Ninjas",
   *
   *   // if shouldShareStreak is false, then
   *   // streakMonths/streakMonthsRaw will be 0
   *   // (the user did not share their sub streak in chat)
   *   "shouldShareStreak": true,
   *   "streakMonths": 7,
   *   "streakMonthsRaw": "7"
   * }
   * Sender user of the USERNOTICE message is the user subbing/resubbing.
   */
  if (msg.isSub()) {
    // Leppunen just subscribed to ninja with a tier 1000 (The Ninjas) sub for the first time!
    console.log(
      msg.displayName +
        " just subscribed to " +
        msg.channelName +
        " with a tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams.subPlanName +
        ") sub for the first time!",
    );
  } else if (msg.isResub()) {
    let streakMessage = "";
    if (msg.eventParams.shouldShareStreak) {
      streakMessage =
        ", currently " + msg.eventParams.streakMonths + " months in a row";
    }
    // Leppunen just resubscribed to ninja with a tier 1000 (The Ninjas) sub!
    // They are resubscribing for 10 months, currently 7 months in a row!
    console.log(
      msg.displayName +
        " just resubscribed to " +
        msg.channelName +
        " with a tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams.subPlanName +
        ") sub! They are resubscribing for " +
        msg.eventParams.cumulativeMonths +
        " months" +
        streakMessage +
        "!",
    );
  }
  if (msg.messageText != null) {
    // you also have access to lots of other properties also present on PRIVMSG messages,
    // such as msg.badges, msg.senderUsername, msg.badgeInfo, msg.bits/msg.isCheer(),
    // msg.color, msg.emotes, msg.messageID, msg.serverTimestamp, etc...
    console.log(
      msg.displayName +
        " shared the following message with the streamer: " +
        msg.messageText,
    );
  } else {
    console.log("They did not share a message with the streamer.");
  }
});

Incoming raids

Twitch says:

Incoming raid to a channel. Raid is a Twitch tool that allows broadcasters to send their viewers to another channel, to help support and grow other members in the community.)

chat.on("USERNOTICE", (msg) => {
  if (!msg.isRaid()) {
    return;
  }
  /*
   * msg.eventParams are:
   * {
   *   "displayName": "Leppunen",
   *   "login": "leppunen",
   *   "viewerCount": 12,
   *   "viewerCountRaw": "12"
   * }
   * Sender user of the USERNOTICE message is the user raiding this channel.
   * Note that the display name and login present in msg.eventParams are
   * the same as msg.displayName and msg.senderUsername, so it doesn't matter
   * which one you use (although I recommend the properties directly on the
   * message object, not in eventParams)
   */
  // source user is the channel/streamer raiding
  // Leppunen just raided Supinic with 12 viewers!
  console.log(
    msg.displayName +
      " just raided " +
      msg.channelName +
      " with " +
      msg.eventParams.viewerCount +
      " viewers!",
  );
});

Subgift

When a user gifts somebody else a subscription.

chat.on("USERNOTICE", (msg) => {
  if (!msg.isSubgift()) {
    return;
  }
  /*
   * msg.eventParams are:
   * {
   *   "months": 5,
   *   "monthsRaw": "5",
   *   "giftMonths": 5,
   *   "giftMonthsRaw": "5",
   *   "recipientDisplayName": "Leppunen",
   *   "recipientID": "42239452",
   *   "recipientUsername": "leppunen",
   *   "subPlan": "1000",
   *   "subPlanName": "The Ninjas",
   *   "senderCount": 5,
   *   "senderCountRaw": "5",
   * }
   * Sender user of the USERNOTICE message is the user gifting the subscription.
   */
  if (msg.eventParams.months === 1) {
    // Leppunen just gifted NymN a fresh tier 1000 (The Ninjas) sub to ninja!
    console.log(
      msg.displayName +
        " just gifted " +
        msg.eventParams.recipientDisplayName +
        " a fresh tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams +
        ") sub to " +
        msg.channelName +
        "!",
    );
  } else {
    // Leppunen just gifted NymN a tier 1000 (The Ninjas) resub to ninja, that's 7 months in a row!
    console.log(
      msg.displayName +
        " just gifted " +
        msg.eventParams.recipientDisplayName +
        " a tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams +
        ") resub to " +
        msg.channelName +
        ", that's " +
        msg.eventParams.months +
        " in a row!",
    );
  }
  // note: if the subgift was from an anonymous user, the sender user for the USERNOTICE message will be
  // AnAnonymousGifter (user ID 274598607)
  if (msg.senderUserID === "274598607") {
    console.log("That (re)sub was gifted anonymously!");
  }
});

Anonsubgift

When an anonymous user gifts a subscription to a viewer.

chat.on("USERNOTICE", (msg) => {
  if (!msg.isAnonSubgift()) {
    return;
  }
  /*
   * msg.eventParams are:
   * {
   *   "months": 5,
   *   "monthsRaw": "5",
   *   "recipientDisplayName": "Leppunen",
   *   "recipientID": "42239452",
   *   "recipientUsername": "leppunen",
   *   "subPlan": "1000",
   *   "subPlanName": "The Ninjas"
   * }
   *
   * WARNING! Sender user of the USERNOTICE message is the broadcaster (e.g. Ninja
   * in the example below)
   */
  if (msg.eventParams.months === 1) {
    // An anonymous gifter just gifted NymN a fresh tier 1000 (The Ninjas) sub to ninja!
    console.log(
      "An anonymous gifter just gifted " +
        msg.eventParams.recipientDisplayName +
        " a fresh tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams +
        ") sub to " +
        msg.channelName +
        "!",
    );
  } else {
    // An anonymous gifter just gifted NymN a tier 1000 (The Ninjas) resub to ninja, that's 7 months in a row!
    console.log(
      "An anonymous gifter just gifted " +
        msg.eventParams.recipientDisplayName +
        " a tier " +
        msg.eventParams.subPlan +
        " (" +
        msg.eventParams +
        ") resub to " +
        msg.channelName +
        ", that's " +
        msg.eventParams.months +
        " in a row!",
    );
  }
});

anongiftpaidupgrade, giftpaidupgrade

When a user commits to continue the gift sub by another user (or an anonymous gifter).

chat.on("USERNOTICE", (msg) => {
  if (!msg.isAnonGiftPaidUpgrade()) {
    return;
  }
  /*
   * msg.eventParams are:
   * EITHER: (ONLY when a promotion is running!)
   * {
   *   "promoName": "Subtember 2018",
   *   "promoGiftTotal": 3987234,
   *   "promoGiftTotalRaw": "3987234"
   * }
   * OR: (when no promotion is running)
   * {}
   *
   * Sender user of the USERNOTICE message is the user continuing their sub.
   */
  // Leppunen is continuing their ninja gift sub they got from an anonymous user!
  console.log(
    msg.displayName +
      " is continuing their " +
      msg.channelName +
      " gift sub they got from an anonymous user!",
  );
});

chat.on("USERNOTICE", (msg) => {
  if (!msg.isGiftPaidUpgrade()) {
    return;
  }
  /*
   * msg.eventParams are:
   * EITHER: (ONLY when a promotion is running!)
   * {
   *   "promoName": "Subtember 2018",
   *   "promoGiftTotal": 3987234,
   *   "promoGiftTotalRaw": "3987234",
   *   "senderLogin": "krakenbul",
   *   "senderName": "Krakenbul"
   * }
   * OR: (when no promotion is running)
   * {
   *   "senderLogin": "krakenbul",
   *   "senderName": "Krakenbul"
   * }
   *
   * Sender user of the USERNOTICE message is the user continuing their sub.
   */
  // Leppunen is continuing their ninja gift sub they got from Krakenbul!
  console.log(
    msg.displayName +
      " is continuing their " +
      msg.channelName +
      " gift sub they got from " +
      msg.msgParam.senderName +
      "!",
  );
});

ritual

Channel ritual. Twitch says:

Channel ritual. Many channels have special rituals to celebrate viewer milestones when they are shared. The rituals notice extends the sharing of these messages to other viewer milestones (initially, a new viewer chatting for the first time).

chat.on("USERNOTICE", (msg) => {
  if (!msg.isRitual()) {
    return;
  }
  /*
   * msg.eventParams are:
   * {
   *   "ritualName": "new_chatter"
   * }
   *
   * Sender user of the USERNOTICE message is the user performing the
   * ritual (e.g. the new chatter).
   */
  // Leppunen is new to ninja's chat! Say hello!
  if (msg.eventParams.ritualName === "new_chatter") {
    console.log(
      msg.displayName + " is new to " + msg.channelName + "'s chat! Say hello!",
    );
  } else {
    console.warn(
      "Unknown (unhandled) ritual type: " + msg.eventParams.ritualName,
    );
  }
});

bitsbadgetier

When a user cheers and earns himself a new bits badge with that cheer (e.g. they just cheered more than/exactly 10000 bits in total, and just earned themselves the 10k bits badge)

chat.on("USERNOTICE", (msg) => {
  if (!msg.isBitsBadgeTier()) {
    return;
  }
  /*
   * msg.eventParams are:
   * {
   *   "threshold": 10000,
   *   "thresholdRaw": "10000",
   * }
   *
   * Sender user of the USERNOTICE message is the user cheering the bits.
   */
  // Leppunen just earned themselves the 10000 bits badge in ninja's channel!
  console.log(
    msg.displayName +
      " just earned themselves the " +
      msg.threshold +
      " bits badge in " +
      msg.channelName +
      "'s channel!",
  );
});

viewermilestone

When a viewer reaches a milestone in the channel (a watch streak)

chat.on("USERNOTICE", (msg) => {
  if (!msg.isViewerMilestone()) return;

  /*
   * msg.eventParams are:
   * {
   *  // The amount of channel points (community points) the user has earned for this milestone
   *  "copoReward": 450,
   *  "copoRewardRaw": "450",
   *
   *  // The amount of streams the user has watched in a row
   *  "value": 15,
   *  "valueRaw": "15",
   *
   *  "category": "watch-streak",
   * }
   * Sender user of the USERNOTICE message is the user announcing their watch streak.
   */
  // mastondzn watched 15 consecutive streams this month and sparked a watch streak!
  console.log(
    `${msg.displayName} watched ${msg.value} consecutive streams this month and sparked a watch streak!`,
  );

  // Users are able to share a message with a milestone
  if (msg.messageText) {
    console.log(
      `${msg.displayName} shared the following message with the streamer: ${msg.messageText}`,
    );
  }
});

ChatClient API

You probably will want to use these functions on ChatClient most frequently:

• chat.join(channelName: string): Promise<void> - Join (Listen to) the channel given by the channel name
• chat.joinAll(channelNames: string[]): Promise<void> - Join (Listen to) all of the listed channels at once (bulk join)
• chat.part(channelName: string): Promise<void> - Part (Leave/Unlisten) the channel given by the channel name
• chat.privmsg(channelName: string, message: string): Promise<void> - Send a raw PRIVMSG to the given channel. You can issue chat commands with this function, e.g. chat.privmsg("forsen", "/timeout weeb123 5") or normal messages, e.g. chat.privmsg("forsen", "Kappa Keepo PogChamp").
• chat.say(channelName: string, message: string): Promise<void> - Say a normal chat message in the given channel. If a command is given as message, it will be escaped.
• chat.me(channelName: string, message: string): Promise<void> - Post a /me message in the given channel.
• chat.ping() - Send a PING on a connection from the pool, and awaits the PONG response. You can use this to measure server latency, for example.

Extra functionality:

• chat.sendRaw(command: string): void - Send a raw IRC command to a connection in the connection pool.
• chat.unconnected (boolean) - Returns whether the client is unconnected.
• chat.connecting (boolean) - Returns whether the client is connecting.
• chat.connected (boolean) - Returns whether the client is connected (Transport layer is connected).
• chat.ready (boolean) - Returns whether the client is ready (Logged into IRC server).
• chat.closed (boolean) - Returns whether the client is closed.

Note that channel names in the above functions always refer to the "login name" of a twitch channel. Channel names may not be capitalized, e.g. Forsen would be invalid, but forsen not. This library also does not accept the leading # character and never returns it on any message objects (e.g. msg.channelName would be forsen, not #forsen).

API Documentation

Generated API documentation can be found here: https://mastondzn.github.io/dank-twitch-irc

Client options

Pass options to the ChatClient constructor. More available options are documented in the Below are all possible options and their default values:

Note! ALL of these configuration options are optional! I highly recommend you only set the very config options you need, the rest are usually at a reasonable default.
For most bots, you only need to set username and password:

let chat = new ChatClient({
  username: "your-bot-username",
  password: "0123456789abcdef1234567",
});

Nevertheless, here are examples of all possible config options:

let chat = new ChatClient({
  username: "your-bot-username", // justinfan12345 by default - For anonymous chat connection
  password: "0123456789abcdef1234567", // undefined by default (no password)
  // Message rate limits configuration for verified and known bots
  // pick one of the presets or configure custom rates as shown below:
  rateLimits: "default",
  // or:
  rateLimits: "knownBot",
  // or:
  rateLimits: "verifiedBot",
  // or:
  rateLimits: {
    highPrivmsgLimits: 100,
    lowPrivmsgLimits: 20,
  },
  // Configuration options for the backing connections:
  // Plain TCP or TLS
  connection: {
    type: "tcp", // tcp by default
    secure: false, // true by default
    // host and port must both be specified at once
    host: "custom-chat-server.com", // irc.chat.twitch.tv by default
    port: 1234, // 6697/6667 by default, depending on the "secure" setting
  },
  // or:
  connection: {
    type: "websocket",
    secure: true, // use preset URL of irc-ws.chat.twitch.tv
  },
  // or:
  connection: {
    type: "websocket",
    url: "wss://custom-url.com/abc/def", // custom URL
  },
  // or:
  connection: {
    type: "duplex",
    stream: () => aNodeJsDuplexInstance, // read and write to a custom object
    // implementing the Duplex interface from Node.js
    // the function you specify is called for each new connection
    preSetup: true, // false by default, makes the lib skip login
    // and capabilities negotiation on connection startup
  },
  // how many channels each individual connection should join at max
  maxChannelCountPerConnection: 100, // 90 by default
  // custom parameters for connection rate limiting
  connectionRateLimits: {
    parallelConnections: 5, // 1 by default
    // time to wait after each connection before a new connection can begin
    releaseTime: 1000, // in milliseconds, 2 seconds by default
  },
  // I recommend you leave this off by default, it makes your bot faster
  // If you need live update of who's joining and leaving chat,
  // poll the tmi.twitch.tv chatters endpoint instead since it
  // is also more reliable
  requestMembershipCapability: false, // false by default
  // read more about mixins below
  // this disables the connection rate limiter, message rate limiter
  // and Room- and Userstate trackers (which are important for other mixins)
  installDefaultMixins: false, // true by default
  // Silence UnandledPromiseRejectionWarnings on all client methods
  // that return promises.
  // With this option enabled, the returned promises will still be rejected/
  // resolved as without this option, this option ONLY silences the
  // UnhandledPromiseRejectionWarning.
  ignoreUnhandledPromiseRejections: true, // false by default
});

Features

This client currently supports the following features:

• Connection pooling and round-robin connection usage
• Automatic rate limiter for connection opening and chat commands
• All twitch-specific message types parsed (CLEARCHAT, CLEARMSG, GLOBALUSERSTATE, HOSTTARGET, JOIN, NOTICE, PART, PING, PONG, PRIVMSG, RECONNECT, ROOMSTATE, USERNOTICE, USERSTATE, WHISPER, CAP)
• Accurate response to server responses (e.g. error thrown if you are banned from channel/channel is suspended/login is invalid etc.)
• Bulk join functionality to join lots of channels quickly
• Implements the recommended connection control, utilizing RECONNECT, PING and PONG
• Full tracking of room state (e.g. submode, emote-only mode, followers mode, r9k etc.) and user state (badges, moderator state, color, etc).
• Most function calls return promises but errors can also be handled by subscribing to the error event
• Slow-mode rate limiter for non-VIP/moderator bots (waits either the global ~1.3 sec/channel-specific slow mode)
• Support for different types of transport (in-memory, TCP, WebSocket)

Extra Mixins

There are some features you might find useful in your bot that are not necessary for general client/bot operations, so they were packaged as mixins. You can activate mixins by calling:

import {
  ChatClient,
  AlternateMessageModifier,
} from "@mastondzn/dank-twitch-irc";

let chat = new ChatClient();
chat.use(new AlternateMessageModifier(client));

Available mixins are:

• new AlternateMessageModifier(chat) will allow your bot to send the same message within a 30 seconds period. You must also use client.say and chat.me for this mixin to behave consistently and reliably.
• new SlowModeRateLimiter(chat, /* optional */ maxWaitingMessages) will rate limit your messages in channels where your bot is not moderator, VIP or broadcaster and has to wait a bit between sending messages. If more than maxWaitingMessages are waiting, the outgoing message will be dropped silently. maxWaitingMessages defaults to 10. Note this mixin only has an effect on chat.say and chat.me functions, not chat.privmsg.

and the mixins installed by default:

• new PrivmsgMessageRateLimiter(chat) - Rate limits outgoing messages according to the rate limits imposed by Twitch. Configure the verified/known status of your bot using the config (see above).
• new ConnectionRateLimiter(chat) - Rate limits new connections according to the rate limits set in the config.
• new UserStateTracker(chat) - Used by other mixins. Keeps track of what state your bot user has in all channels.
• new RoomStateTracker() - Used by other mixins. Keeps track of each channel's state, e.g. sub-mode etc.
• new IgnoreUnhandledPromiseRejectionsMixin() - Silences UnhandledPromiseRejectionWarnings on promises returned by the client's functions. (installed for you if you activate the ignoreUnhandledPromiseRejections client option)
• new JoinRateLimiter(chat) - Rate limits new joins according to join rate limits set in the config.

Tests

pnpm run test

Lint and check code style

# Run eslint rules and checks code style with prettier
pnpm run lint
pnpm run format:check

# Run eslint and prettier fixing
pnpm run lint -- --fix
pnpm run format