fix(TypingStart): typing methods returning falsy values (#3939)

* fix: typing methods returning falsy values

* fix: eslint

* fix: no provided parameters; updated jsdocs

* fix(Typings): reflect typingStop

* refactor: since and lastTimestamp merged into one constructable value

* feat(Typings): document Channel#_typing

* feat: emit TypingData on typingStart; update jsdocs

* feat(Typings): move _typing to TextBasedChannel; sort props alphabetic

* feat(Event): remove typingStop

* feat(Typings): update typings - remove typingStop

* feat(Event): remove typingStop from Constants

* feat(Typing): remove TypingData class - redundant

* refactor(Events): remove TYPING_STOP event

* refactor(TypingData): now is an interface for _typing

* fix(TypingStart): timeout variable, removed emit for TypingData

* feat(Typing): timeout property on Channel#_typing, remove redundancy

* fix(Typings): extra overload(s)

Co-Authored-By: Sugden <28943913+NotSugden@users.noreply.github.com>

* Update index.d.ts

* fix(Typings): remove "private" from interface — invalid TS

* feat(Typings): add PartialUser in case partials are enabled

Co-Authored-By: Sugden <28943913+NotSugden@users.noreply.github.com>

* feat(Typings): document 'timeout' property of TypingData

Co-authored-by: Crawl <icrawltogo@gmail.com>
Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>

src/client/websocket/handlers/TYPING_START.js

@@ -5,8 +5,32 @@ const { Events } = require('../../../util/Constants');
 module.exports = (client, { d: data }) => {
   const channel = client.channels.cache.get(data.channel_id);
   const user = client.users.cache.get(data.user_id);
+  const timestamp = new Date(data.timestamp * 1000);
 
   if (channel && user) {
+    if (channel.type === 'voice') {
+      client.emit(Events.WARN, `Discord sent a typing packet to a voice channel ${channel.id}`);
+      return;
+    }
+
+    if (channel._typing.has(user.id)) {
+      const typing = channel._typing.get(user.id);
+
+      typing.lastTimestamp = timestamp;
+      typing.elapsedTime = Date.now() - typing.since;
+      client.clearTimeout(typing.timeout);
+      typing.timeout = tooLate(channel, user);
+    } else {
+      const since = new Date();
+      const lastTimestamp = new Date();
+      channel._typing.set(user.id, {
+        user,
+        since,
+        lastTimestamp,
+        elapsedTime: Date.now() - since,
+        timeout: tooLate(channel, user),
+      });
+
       /**
        * Emitted whenever a user starts typing in a channel.
        * @event Client#typingStart
@@ -15,4 +39,11 @@ module.exports = (client, { d: data }) => {
        */
       client.emit(Events.TYPING_START, channel, user);
     }
+  }
 };
+
+function tooLate(channel, user) {
+  return channel.client.setTimeout(() => {
+    channel._typing.delete(user.id);
+  }, 10000);
+}

typings/index.d.ts

@@ -1952,6 +1952,7 @@ declare module 'discord.js' {
   }
 
   interface TextBasedChannelFields extends PartialTextBasedChannelFields {
+    _typing: Map<string, TypingData>;
     lastPinTimestamp: number | null;
     readonly lastPinAt: Date;
     typing: boolean;
@@ -2780,15 +2781,11 @@ declare module 'discord.js' {
     partial: true;
     fetch(): Promise<T>;
   } & {
-    [K in keyof Omit<T,
-      'client' |
-      'createdAt' |
-      'createdTimestamp' |
-      'id' |
-      'partial' |
-      'fetch' | O>
-      // tslint:disable-next-line:ban-types
-    ]: T[K] extends Function ? T[K] : T[K] | null;
+    [K in keyof Omit<
+      T,
+      'client' | 'createdAt' | 'createdTimestamp' | 'id' | 'partial' | 'fetch'
+    >]: // tslint:disable-next-line:ban-types
+    T[K] extends Function ? T[K] : T[K] | null;
   };
 
   interface PartialDMChannel extends Partialize<DMChannel,
@@ -2960,6 +2957,14 @@ declare module 'discord.js' {
 
   type TargetUser = number;
 
+  interface TypingData {
+    user: User | PartialUser;
+    since: Date;
+    lastTimestamp: Date;
+    elapsedTime: number;
+    timeout: NodeJS.Timeout;
+  }
+
   type UserResolvable = User | Snowflake | Message | GuildMember;
 
   type VerificationLevel = 'NONE' | 'LOW' | 'MEDIUM' | 'HIGH' | 'VERY_HIGH';