Make options optional in StyleObserver() and ElementStyleObserver() constructors, fixes #108

Author: LeaVerou

src/element-style-observer.js

@@ -74,7 +74,7 @@ export default class ElementStyleObserver {
 	/**
 	 * @param {Element} target
 	 * @param {StyleObserverCallback} callback
-	 * @param {StyleObserverOptions} options
+	 * @param {StyleObserverOptions} [options]
 	 */
 	constructor (target, callback, options = {}) {
 		this.constructor.all.add(target, this);

src/style-observer.js

@@ -19,7 +19,7 @@ export default class StyleObserver {
 
 	/**
 	 * @param {StyleObserverCallback} callback
-	 * @param {StyleObserverOptions | string | string[]} options
+	 * @param {StyleObserverOptions | string | string[]} [options]
 	 */
 	constructor (callback, options) {
 		this.callback = callback;