Event System

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TomoriBot routes Discord gateway events and REST rate-limit notifications through one dispatcher in src/handlers/eventHandler.ts.

Dispatcher model

The dispatcher maps Discord event names to folder names under src/events/ using eventFolderMap.

Shallow module discovery: At startup, getHandlerFiles() scans for *.ts files directly inside each mapped folder. Subdirectories are ignored by the loader, reserving nested folders under src/events/<eventName>/ for event-local helper modules.
Lexical execution order: Handlers within a folder are imported dynamically and sorted alphabetically by filename before caching. When an event fires, its handlers execute sequentially in that order.
Isolated execution: Each handler runs in its own try...catch block. A thrown error in one handler logs structured metadata (EventHandlerError) without preventing subsequent handlers from executing for that event.
Activity tracking: Dispatched gateway events call healthTracker.recordActivity(). The health endpoint reports activity age as a diagnostic; readiness and WebSocket ping determine its verdict.
Fan-in mapping: Multiple Discord events can map to a single handler folder. For example, emojiCreate, emojiDelete, and emojiUpdate all route to guildEmojisUpdate, while stickerCreate, stickerDelete, and stickerUpdate route to guildStickersUpdate.

REST rate limits

REST rate limits arrive on client.rest.on("rateLimited", ...). In discord.js v14, the REST rate limiter is owned by the REST client. setupEventListeners() checks for the rateLimit folder separately and registers the listener on client.rest rather than the gateway client.

Primary event flows

Slash commands and interactions

The gateway event interactionCreate routes to src/events/interactionCreate/handleCommands.ts. The handler separates chat-input commands, autocomplete requests, and globally routed component or modal interactions, dispatching each to its respective runner. See Command System for interaction lifecycle and timing constraints.

Chat messages

The messageCreate event routes to src/events/messageCreate/tomoriChat.ts. The handler normalizes incoming messages, evaluates server admission and ignore rules, manages per-channel execution queues, and runs turn planning and generation. See Normalize Invocation for chat normalization and admission details.

src/events/messageCreate/activeNudge.ts sorts first and feeds the Natural Nudges active-nudge counter. It starts the counter without awaiting it, because handlers run one after another and a cold settings read must never delay tomoriChat. A tripped check runs detached as well. See Natural Nudges.

Startup initialization

The clientReady event runs startup initialization tasks, including registering application slash commands with Discord (src/events/clientReady/01_registercommands.ts) and initializing Model Context Protocol (MCP) servers.

Member joins and the welcome gate

The guildMemberAdd event routes to src/events/guildMemberAdd/newUser.ts:

Registers the user row in the database via userRepository.register.
Evaluates guild welcome configuration. If the server has Membership Screening or Onboarding enabled, helpers/welcomeGate.ts retains an in-memory waiter per member until screening clears and onboarding completes (CompletedOnboarding flag on guildMemberUpdate).
If the member leaves before clearing screening, guildMemberRemove cancels the waiter. Waiters that never resolve are dropped after one hour (WELCOME_GATE_MAX_WAIT_MS).
Once screening clears, the handler verifies the member is still in the guild and invokes the welcome greeting through the standard chat coordinator pipeline. The greeting borrows the channel’s latest message only for placement; that speaker’s blacklist status, role restrictions, and personal credentials do not control the welcome. Like other system triggers (textQuotaSource: "system"), it gets no reply directive or native reply to that message when it waits in a busy channel’s queue (answersQueuedTriggerMessage() in src/utils/chat/contextDirectives.ts).
While the greeting is being prepared, src/utils/chat/welcomeHandoff.ts holds a handoff window keyed by welcome channel and member. If the member triggers Tomori in that channel first, chat admission injects the welcome context into their own turn and the standalone greeting is skipped, so they get one reply instead of two. Once the greeting turn claims the window, a member turn for its anchor message is dropped, and later member messages queue behind the greeting as usual.

Extending event handling

Adding a new event handler or mapping a new Discord event is documented in the contributor guide Adding an Event Handler.

Source pointers

src/handlers/eventHandler.ts: single event dispatcher and listener setup.
src/events/interactionCreate/handleCommands.ts: slash command, autocomplete, and interaction dispatch.
src/events/messageCreate/tomoriChat.ts: chat pipeline entry point.
src/events/messageCreate/activeNudge.ts: Natural Nudges active-nudge counter.
src/events/guildMemberAdd/newUser.ts: member registration and welcome gate runner.
src/utils/misc/healthTracker.ts: liveness tracking.