Add Client.fetchInvite

src/client/Client.js

@@ -191,6 +191,15 @@ class Client extends EventEmitter {
     return this.rest.methods.getUser(id);
   }
 
+  /**
+   * Fetches an invite object from an invite code.
+   * @param {string} code the invite code.
+   * @returns {Promise<Invite, Error>}
+   */
+  fetchInvite(code) {
+    return this.rest.methods.getInvite(code);
+  }
+
   /**
    * Returns a Collection, mapping Guild ID to Voice Connections.
    * @readonly

src/client/rest/RESTMethods.js

@@ -477,6 +477,14 @@ class RESTMethods {
     });
   }
 
+  getInvite(code) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('get', Constants.Endpoints.invite(code), true)
+        .then(invite => resolve(new Invite(this.rest.client, invite)))
+        .catch(reject);
+    });
+  }
+
   getGuildInvites(guild) {
     return new Promise((resolve, reject) => {
       this.rest.makeRequest('get', Constants.Endpoints.guildInvites(guild.id), true).then(inviteItems => {

src/structures/Invite.js

@@ -23,7 +23,8 @@ const PartialGuildChannel = require('./PartialGuildChannel');
 */
 
 /**
- * Represents an Invitation to a Guild Channel
+ * Represents an Invitation to a Guild Channel.
+ * <warn>The only guaranteed properties are `code`, `guild` and `channel`. Other properties can be missing.</warn>
  */
 class Invite {
   constructor(client, data) {
@@ -75,11 +76,13 @@ class Invite {
      */
     this.maxUses = data.max_uses;
 
-    /**
-     * The user who created this invite
-     * @type {User}
-     */
-    this.inviter = this.client.dataManager.newUser(data.inviter);
+    if (data.inviter) {
+      /**
+       * The user who created this invite
+       * @type {User}
+       */
+      this.inviter = this.client.dataManager.newUser(data.inviter);
+    }
 
     /**
      * The Channel the invite is for. If this Channel is already known, this will be a GuildChannel object.