restructer and move to esdoc

src/Bindings/Binding.js

@@ -0,0 +1,36 @@
+
+import { createMutualExclude } from '../Util/mutualExclude.js'
+
+/**
+ * Abstract class for bindings
+ *
+ * A binding handles data binding from a Yjs type to a data object. For example,
+ * you can bind a Quill editor instance to a YText instance with the `QuillBinding` class.
+ *
+ * It is expected that a concrete implementation accepts two parameters
+ * (type and binding target).
+ *
+ * @example
+ *   const quill = new Quill(document.createElement('div'))
+ *   const type = y.define('quill', Y.Text)
+ *   const binding = new Y.QuillBinding(quill, type)
+ *
+ */
+export default class Binding {
+  /**
+   * @param {YType} type Yjs type
+   * @param {any} target Binding Target
+   */
+  constructor (type, target) {
+    this.type = type
+    this.target = target
+    this._mutualExclude = createMutualExclude()
+  }
+  /**
+   * Remove all data observers (both from the type and th target).
+   */
+  destroy () {
+    this.type = null
+    this.target = null
+  }
+}