add docs for ClientManager

src/client/ClientManager.js

@@ -1,12 +1,32 @@
 const Constants = require('../util/Constants');
 
+/**
+ * Manages the State and Background Tasks of the Client
+ * @class ClientManager
+ * @private
+ */
 class ClientManager {
 
   constructor(client) {
+    /**
+     * The Client that instantiated this Manager
+     * @type {Client}
+     */
     this.client = client;
+    /**
+     * The heartbeat interval, null if not yet set
+     * @type {?Number}
+     */
     this.heartbeatInterval = null;
   }
 
+  /**
+   * Connects the Client to the WebSocket
+   * @param {String} token the authorization token
+   * @param {Function} resolve function to run when connection is successful
+   * @param {Function} reject function to run when connection fails
+   * @returns {null}
+   */
   connectToWebSocket(token, resolve, reject) {
     this.client.store.token = token;
     this.client.rest.methods.getGateway()
@@ -19,6 +39,11 @@ class ClientManager {
     setTimeout(() => reject(Constants.Errors.TOOK_TOO_LONG), 1000 * 15);
   }
 
+  /**
+   * Sets up a keep-alive interval to keep the Client's connection valid
+   * @param {Number} time the interval in milliseconds at which heartbeat packets should be sent
+   * @returns {null}
+   */
   setupKeepAlive(time) {
     this.heartbeatInterval = setInterval(() => {
       this.client.ws.send({