refactor: remove unnecessary checks (#6777)

src/client/actions/TypingStart.js

@@ -7,16 +7,15 @@ const { Events, TextBasedChannelTypes } = require('../../util/Constants');
 class TypingStart extends Action {
   handle(data) {
     const channel = this.getChannel(data);
-    if (!channel) {
-      return;
-    }
+    if (!channel) return;
+
     if (!TextBasedChannelTypes.includes(channel.type)) {
       this.client.emit(Events.WARN, `Discord sent a typing packet to a ${channel.type} channel ${channel.id}`);
       return;
     }
 
     const user = this.getUserFromMember(data);
-    if (channel && user) {
+    if (user) {
       /**
        * Emitted whenever a user starts typing in a channel.
        * @event Client#typingStart

src/client/websocket/handlers/CHANNEL_PINS_UPDATE.js

@@ -4,11 +4,11 @@ const { Events } = require('../../../util/Constants');
 
 module.exports = (client, { d: data }) => {
   const channel = client.channels.cache.get(data.channel_id);
-  const time = new Date(data.last_pin_timestamp);
+  const time = data.last_pin_timestamp ? new Date(data.last_pin_timestamp).getTime() : null;
 
-  if (channel && !Number.isNaN(time.getTime())) {
+  if (channel) {
     // Discord sends null for last_pin_timestamp if the last pinned message was removed
-    channel.lastPinTimestamp = time.getTime() ?? null;
+    channel.lastPinTimestamp = time;
 
     /**
      * Emitted whenever the pins of a channel are updated. Due to the nature of the WebSocket event,