chore: Add comments

lib/entry-state.js

@@ -16,16 +16,18 @@ module.exports = async function attachEntryState (entry) {
   if (!publishedEntry) {
     entry.draft = true
   }
-
+  // We group fields of type link (i.e. Only objects/array) from the same entry in preview and delivery
   const entriesToCompare = Object.keys(entry.fields).map((key) => {
     const field = entry.fields[key]
     if (isObject(field)) {
       return [entry.fields[key], publishedEntry.fields[key]]
     }
   }).filter(Boolean)
+
   entriesToCompare.forEach((item) => {
     const originalItem = item[0]
     const publishedItem = item[1]
+    // If the field is an array of reference we need to check its item if they have pending changes
     if (isArray(originalItem)) {
       originalItem.forEach((innerItem, index) => {
         if (!isArray(innerItem) && isObject(innerItem) && (!innerItem.fields || originalItem[index].sys.updatedAt !== publishedItem[index].sys.updatedAt)) {
@@ -33,12 +35,13 @@ module.exports = async function attachEntryState (entry) {
           return
         }
       })
+      // If the field is a single reference we just check if it has pending changes
     } else if (isObject(item[0]) && (!item[0].fields || item[0].sys.updatedAt !== item[1].sys.updatedAt)) {
       entry.pendingChanges = true
       return
     }
   })
-
+  // We check if the root element has pending changes
   if (entry && publishedEntry && (entry.sys.updatedAt !== publishedEntry.sys.updatedAt)) {
     entry.pendingChanges = true
   }