Make config parameter optional

src/foresight.ts

@@ -22,10 +22,10 @@ interface ForesightConfig {
   /** Configure the intersection observer. */
   observerOptions?: IntersectionObserverInit
 
-  /** Treat clicks as an interactive event. Defaults to true. */
+  /** Treat clicks as an interactive event. Defaults to `true`. */
   clicksAreInteractions?: boolean
 
-  /** Treat views as an interactive event. Defaults to false. */
+  /** Treat views as an interactive event. Defaults to `false`. */
   viewsAreInteractions?: boolean
 }
 
@@ -53,9 +53,9 @@ class Foresight {
    */
   static defaultOptions: Partial<ForesightConfig> = {
     defer: false,
+    observerOptions: {},
     clicksAreInteractions: true,
     viewsAreInteractions: false,
-    observerOptions: {},
   }
 
   /**
@@ -80,7 +80,7 @@ class Foresight {
   /**
    * @constructor
    */
-  constructor(config: ForesightConfig) {
+  constructor(config: ForesightConfig = {}) {
     this.options = { ...Foresight.defaultOptions, ...config };
 
     // Initialise IntersectionObserver
@@ -100,7 +100,8 @@ class Foresight {
   }
 
   /**
-   * Start event tracking for all DOM elements with event tracking attributes.
+   * Start tracking all elements with tracking attributes for events.
+   * @param {Element} root The container to scan for elements. Defaults to `body`.
    */
   start(root: Element = document.body) {
     if (gtag === undefined) {
@@ -113,7 +114,7 @@ class Foresight {
   }
 
   /**
-   * Enables event tracking for a DOM element with event tracking attribute.
+   * Start tracking an element for events.
    */
   track(element: Element) {
     if (!this._untrackFns.has(element)) {
@@ -140,7 +141,7 @@ class Foresight {
   }
 
   /**
-   * Disable event tracking for a DOM element.
+   * Stop tracking an element for events.
    */
   untrack(element: Element) {
     const untrackFn = this._untrackFns.get(element);