Adding more documentation to make it easier when writing extensions.

ignite-element.js

@@ -50,10 +50,19 @@ class IgniteElement extends HTMLElement {
     constructor() {
         super();
 
+        /** @type {Boolean} */
         this.elementConnected = false; //Used to know if the connectedCallback was already called.
+
+        /** @type {IgniteTemplate} */
         this.template = null;
+
+        /** @type {HTMLElement[]} */
         this.elements = [];
+
+        /** @type {IgniteCallback} */
         this.readyCallback = new IgniteCallback(() => this.ready());
+
+        /** @type {IgniteCallback[]} */
         this.onDisconnectCallbacks = [];
 
         //Create the variables for this element.