Move content and list iteration abstraction

src/utils/StructStore.js

@@ -199,19 +199,18 @@ export const getItemCleanStart = (transaction, id) => {
  * Expects that id is actually in store. This function throws or is an infinite loop otherwise.
  *
  * @param {Transaction} transaction
- * @param {StructStore} store
  * @param {ID} id
  * @return {Item}
  *
  * @private
  * @function
  */
-export const getItemCleanEnd = (transaction, store, id) => {
+export const getItemCleanEnd = (transaction, id) => {
   /**
    * @type {Array<Item>}
    */
   // @ts-ignore
-  const structs = store.clients.get(id.client)
+  const structs = transaction.doc.store.clients.get(id.client)
   const index = findIndexSS(structs, id.clock)
   const struct = structs[index]
   if (id.clock !== struct.id.clock + struct.length - 1 && struct.constructor !== GC) {

src/utils/Transaction.js

@@ -377,9 +377,12 @@ const cleanupTransactions = (transactionCleanups, i) => {
 /**
  * Implements the functionality of `y.transact(()=>{..})`
  *
+ * @template T
+ *
  * @param {Doc} doc
- * @param {function(Transaction):void} f
+ * @param {function(Transaction):T} f
  * @param {any} [origin=true]
+ * @return {T}
  *
  * @function
  */
@@ -395,8 +398,9 @@ export const transact = (doc, f, origin = null, local = true) => {
     }
     doc.emit('beforeTransaction', [doc._transaction, doc])
   }
+  let res
   try {
-    f(doc._transaction)
+    res = f(doc._transaction)
   } finally {
     if (initialCall && transactionCleanups[0] === doc._transaction) {
       // The first transaction ended, now process observer calls.
@@ -410,4 +414,5 @@ export const transact = (doc, f, origin = null, local = true) => {
       cleanupTransactions(transactionCleanups, 0)
     }
   }
+  return res
 }