fix(xxxable): follow more properly with discord behavior (#6551)

Co-authored-by: SpaceEEC <spaceeec@yahoo.com>

src/structures/GuildChannel.js

@@ -497,11 +497,7 @@ class GuildChannel extends Channel {
    * @readonly
    */
   get deletable() {
-    return (
+    return this.manageable && this.guild.rulesChannelId !== this.id && this.guild.publicUpdatesChannelId !== this.id;
-      this.permissionsFor(this.client.user).has(Permissions.FLAGS.MANAGE_CHANNELS, false) &&
-      this.guild.rulesChannelId !== this.id &&
-      this.guild.publicUpdatesChannelId !== this.id
-    );
   }
 
   /**

src/structures/Message.js

@@ -548,7 +548,7 @@ class Message extends Base {
    * @readonly
    */
   get editable() {
-    return this.author.id === this.client.user.id;
+    return Boolean(this.author.id === this.client.user.id && !this.deleted && (!this.guild || this.channel?.viewable));
   }
 
   /**
@@ -557,10 +557,19 @@ class Message extends Base {
    * @readonly
    */
   get deletable() {
+    if (this.deleted) {
+      return false;
+    }
+    if (!this.guild) {
+      return this.author.id === this.client.user.id;
+    }
+    // DMChannel does not have viewable property, so check viewable after proved that message is on a guild.
+    if (!this.channel?.viewable) {
+      return false;
+    }
     return Boolean(
-      !this.deleted &&
+      this.author.id === this.client.user.id ||
-        (this.author.id === this.client.user.id ||
+        this.channel.permissionsFor(this.client.user)?.has(Permissions.FLAGS.MANAGE_MESSAGES, false),
-          this.channel.permissionsFor?.(this.client.user)?.has(Permissions.FLAGS.MANAGE_MESSAGES)),
     );
   }
 
@@ -572,7 +581,10 @@ class Message extends Base {
   get pinnable() {
     return Boolean(
       !this.system &&
-        (!this.guild || this.channel.permissionsFor(this.client.user)?.has(Permissions.FLAGS.MANAGE_MESSAGES, false)),
+        !this.deleted &&
+        (!this.guild ||
+          (this.channel?.viewable &&
+            this.channel.permissionsFor(this.client.user)?.has(Permissions.FLAGS.MANAGE_MESSAGES, false))),
     );
   }
 
@@ -595,14 +607,16 @@ class Message extends Base {
    * @readonly
    */
   get crosspostable() {
-    return (
+    const bitfield =
-      this.channel.type === 'GUILD_NEWS' &&
+      Permissions.FLAGS.SEND_MESSAGES |
-      !this.flags.has(MessageFlags.FLAGS.CROSSPOSTED) &&
+      (this.author.id === this.client.user.id ? Permissions.defaultBit : Permissions.FLAGS.MANAGE_MESSAGES);
-      this.type === 'DEFAULT' &&
+    return Boolean(
-      this.channel.viewable &&
+      this.channel?.type === 'GUILD_NEWS' &&
-      this.channel.permissionsFor(this.client.user).has(Permissions.FLAGS.SEND_MESSAGES) &&
+        !this.flags.has(MessageFlags.FLAGS.CROSSPOSTED) &&
-      (this.author.id === this.client.user.id ||
+        this.type === 'DEFAULT' &&
-        this.channel.permissionsFor(this.client.user).has(Permissions.FLAGS.MANAGE_MESSAGES))
+        this.channel.viewable &&
+        this.channel.permissionsFor(this.client.user)?.has(bitfield, false) &&
+        !this.deleted,
     );
   }
 

src/structures/VoiceChannel.js

@@ -8,15 +8,6 @@ const Permissions = require('../util/Permissions');
  * @extends {BaseGuildVoiceChannel}
  */
 class VoiceChannel extends BaseGuildVoiceChannel {
-  /**
-   * Whether the channel is deletable by the client user
-   * @type {boolean}
-   * @readonly
-   */
-  get deletable() {
-    return super.deletable && this.permissionsFor(this.client.user).has(Permissions.FLAGS.CONNECT, false);
-  }
-
   /**
    * Whether the channel is editable by the client user
    * @type {boolean}
@@ -24,7 +15,7 @@ class VoiceChannel extends BaseGuildVoiceChannel {
    * @deprecated Use {@link VoiceChannel#manageable} instead
    */
   get editable() {
-    return this.manageable && this.permissionsFor(this.client.user).has(Permissions.FLAGS.CONNECT, false);
+    return this.manageable;
   }
 
   /**