restructuring the project

src/types/YXmlEvent.js

@@ -0,0 +1,54 @@
+/**
+ * @module types
+ */
+
+import { YEvent } from '../utils/YEvent.js'
+
+import { Type } from '../structs/Type.js' // eslint-disable-line
+import { Transaction } from '../utils/Transaction.js' // eslint-disable-line
+
+/**
+ * An Event that describes changes on a YXml Element or Yxml Fragment
+ *
+ * @protected
+ */
+export class YXmlEvent extends YEvent {
+  /**
+   * @param {Type} target The target on which the event is created.
+   * @param {Set} subs The set of changed attributes. `null` is included if the
+   *                   child list changed.
+   * @param {Boolean} remote Whether this change was created by a remote peer.
+   * @param {Transaction} transaction The transaction instance with wich the
+   *                                  change was created.
+   */
+  constructor (target, subs, remote, transaction) {
+    super(target)
+    /**
+     * The transaction instance for the computed change.
+     * @type {Transaction}
+     */
+    this._transaction = transaction
+    /**
+     * Whether the children changed.
+     * @type {Boolean}
+     */
+    this.childListChanged = false
+    /**
+     * Set of all changed attributes.
+     * @type {Set}
+     */
+    this.attributesChanged = new Set()
+    /**
+     * Whether this change was created by a remote peer.
+     * @type {Boolean}
+     */
+    this.remote = remote
+    subs.forEach((sub) => {
+      if (sub === null) {
+        this.childListChanged = true
+      } else {
+        this.attributesChanged.add(sub)
+      }
+    })
+  }
+}