Add JSDocs for isFunctions and customDeepEqual

packages/utils/src/deepEquals.ts

@@ -1,9 +1,22 @@
 import { createCustomEqual, State } from 'fast-equals';
 
+/** Check if all parameters are typeof function.
+ *
+ * @param a - The first element to check typeof
+ * @param b - The second element to check typeof
+ * @returns - if typeof a and b are equal to function return true, otherwise false
+ */
 function isFunctions(a: any, b: any) {
   return typeof a === 'function' && typeof b === 'function';
 }
 
+/** Implements a deep equals using the `fast-equal.createCustomEqual` function, that provides a customized comparator that
+ * assumes all functions in objects are equivalent.
+ *
+ * @param a - The first element to compare
+ * @param b - The second element to compare
+ * @returns - True if the `a` and `b` are deeply equal, false otherwise
+ */
 const customDeepEqual = createCustomEqual({
   createInternalComparator: (comparator: (a: any, b: any, state: State<any>) => boolean) => {
     return (a: any, b: any, _idxA: any, _idxB: any, _parentA: any, _parentB: any, state: State<any>) => {