Add User typing methods

src/structures/User.js

@@ -84,6 +84,36 @@ class User {
     return Constants.Endpoints.avatar(this.id, this.avatar);
   }
 
+  /**
+   * Check whether the user is typing in a channel.
+   * @param {ChannelResolvable} channel The channel to check in
+   * @returns {boolean}
+   */
+  isTyping(channel) {
+    channel = this.client.resolver.resolveChannel(channel);
+    return channel._typing.has(this.id);
+  }
+
+  /**
+   * Get the time that the user started typing.
+   * @param {ChannelResolvable} channel The channel to get the time in
+   * @returns {?Date}
+   */
+  typingSince(channel) {
+    channel = this.client.resolver.resolveChannel(channel);
+    return channel._typing.has(this.id) ? new Date(channel._typing.get(this.id).since) : null;
+  }
+
+  /**
+   * Get the amount of time the user has been typing in a channel for (in milliseconds), or -1 if they're not typing.
+   * @param {ChannelResolvable} channel The channel to get the time in
+   * @returns {number}
+   */
+  typingDuration(channel) {
+    channel = this.client.resolver.resolveChannel(channel);
+    return channel._typing.has(this.id) ? channel._typing.get(this.id).elapsedTime : -1;
+  }
+
   /**
    * Deletes a DM Channel (if one exists) between the Client and the User. Resolves with the Channel if successful.
    * @returns {Promise<DMChannel>}