Some more deprecations

closure/goog/array/array.js

@@ -365,6 +365,7 @@ goog.array.count = function(arr, f, opt_obj) {
  * @return {T|null} The first array element that passes the test, or null if no
  *     element is found.
  * @template T,S
+ * @deprecated Use arr.find(f) instead
  */
 goog.array.find = function(arr, f, opt_obj) {
   var i = goog.array.findIndex(arr, f, opt_obj);
@@ -385,6 +386,7 @@ goog.array.find = function(arr, f, opt_obj) {
  * @return {number} The index of the first array element that passes the test,
  *     or -1 if no element is found.
  * @template T,S
+ * @deprecated Use arr.findIndex(f) instead
  */
 goog.array.findIndex = function(arr, f, opt_obj) {
   var l = arr.length;  // must be fixed during loop... see docs
@@ -450,6 +452,7 @@ goog.array.findIndexRight = function(arr, f, opt_obj) {
  *     element.
  * @param {*} obj The object for which to test.
  * @return {boolean} true if obj is present.
+ * @deprecated Use arr.includes(obj) instead
  */
 goog.array.contains = function(arr, obj) {
   return goog.array.indexOf(arr, obj) >= 0;
@@ -993,6 +996,7 @@ goog.array.binarySearch_ = function(
  *     negative number, zero, or a positive number depending on whether the
  *     first argument is less than, equal to, or greater than the second.
  * @template T
+ * @deprecated Use arr.sort(opt_compareFn) instead
  */
 goog.array.sort = function(arr, opt_compareFn) {
   // TODO(arv): Update type annotation since null is not accepted.

closure/goog/base.js

@@ -680,6 +680,14 @@ goog.isNull = function(val) {
  * Returns true if the specified value is defined and not null.
  * @param {?} val Variable to test.
  * @return {boolean} Whether variable is defined and not null.
+ * @deprecated Try to avoid having a variable use null and 
+ * undefined at the same time by:
+ * - Using default parameter values
+ * - Nullish coalescing operator
+ * - Optional chaining
+ *
+ * If none of the above is appicable use `!= null` to check for 
+ * null and undefined
  */
 goog.isDefAndNotNull = function(val) {
   // Note that undefined == null.

closure/goog/dom/dom.js

@@ -250,6 +250,7 @@ goog.dom.getElementByTagNameAndClass = function(opt_tag, opt_class, opt_el) {
  * @param {string} className the name of the class to look for.
  * @param {(Document|Element)=} opt_el Optional element to look in.
  * @return {!IArrayLike<!Element>} The items found with the class name provided.
+ * @deprecated Use document.querySelectorAll('.classname') or element.querySelectorAll('.classname') instead
  */
 goog.dom.getElementsByClass = function(className, opt_el) {
   var parent = opt_el || document;
@@ -267,6 +268,7 @@ goog.dom.getElementsByClass = function(className, opt_el) {
  * @param {string} className the name of the class to look for.
  * @param {Element|Document=} opt_el Optional element to look in.
  * @return {Element} The first item with the class name provided.
+ * @deprecated Use document.querySelector('.classname') or element.querySelector('.classname') instead
  */
 goog.dom.getElementByClass = function(className, opt_el) {
   var parent = opt_el || document;
@@ -1270,6 +1272,7 @@ goog.dom.insertChildAt = function(parent, child, index) {
  * Removes a node from its parent.
  * @param {Node} node The node to remove.
  * @return {Node} The node removed if removed; else, null.
+ * @deprecated Use node.parentNode?.removeChild(node) instead
  */
 goog.dom.removeNode = function(node) {
   return node && node.parentNode ? node.parentNode.removeChild(node) : null;