feat(Emoji): move createdAt and createdTimestamp getters from GuildEmoji (#2872)

src/structures/Emoji.js

@@ -1,5 +1,7 @@
+const Snowflake = require('../util/Snowflake');
 const Base = require('./Base');
 
+
 /**
  * Represents an emoji, see {@link GuildEmoji} and {@link ReactionEmoji}.
  * @extends {Base}
@@ -52,6 +54,26 @@ class Emoji extends Base {
     return this.client.rest.cdn.Emoji(this.id, this.animated ? 'gif' : 'png');
   }
 
+  /**
+   * The timestamp the emoji was created at, or null if unicode
+   * @type {?number}
+   * @readonly
+   */
+  get createdTimestamp() {
+    if (!this.id) return null;
+    return Snowflake.deconstruct(this.id).timestamp;
+  }
+
+  /**
+   * The time the emoji was created at, or null if unicode
+   * @type {?Date}
+   * @readonly
+   */
+  get createdAt() {
+    if (!this.id) return null;
+    return new Date(this.createdTimestamp);
+  }
+
   /**
    * When concatenated with a string, this automatically returns the text required to form a graphical emoji on Discord
    * instead of the Emoji object.