prelim refactor commit

src/utils/structEncoding.js

@@ -1,5 +1,30 @@
+import * as encoding from 'lib0/encoding.js'
+import * as decoding from 'lib0/decoding.js'
+import { getStructReference } from './structReferences.js'
+import { ID, createID, writeID, writeNullID } from './ID.js'
+import * as binary from 'lib0/binary.js'
 
 export const writeStructToTransaction = (transaction, struct) => {
   transaction.encodedStructsLen++
   struct._toBinary(transaction.encodedStructs)
 }
+
+const structRefs = [
+  ItemBinaryRef
+]
+
+/**
+ * Read the next Item in a Decoder and fill this Item with the read data.
+ *
+ * This is called when data is received from a remote peer.
+ *
+ * @param {Y} y The Yjs instance that this Item belongs to.
+ * @param {decoding.Decoder} decoder The decoder object to read data from.
+ * @return {AbstractRef}
+ *
+ * @private
+ */
+export const read = decoder => {
+  const info = decoding.readUint8(decoder)
+  return new structRefs[binary.BITS5 & info](decoder, info)
+}