visitor(split-member-object): add new visitor

Signed-off-by: echo094 <[email protected]>

src/visitor/split-member-object.js

@@ -0,0 +1,38 @@
+function splitMemberObject(path) {
+  const object = path.get('object')
+  if (!object.isAssignmentExpression()) {
+    return
+  }
+  let insertPath = path
+  while (!insertPath?.listKey) {
+    if (insertPath.parentPath.isAssignmentExpression()) {
+      insertPath = insertPath.parentPath
+      continue
+    }
+    if (insertPath.parentPath.isExpressionStatement()) {
+      insertPath = insertPath.parentPath
+      continue
+    }
+    return
+  }
+  insertPath.insertBefore(object.node)
+  object.replaceWith(object.node.left)
+  insertPath.scope.crawl()
+}
+
+/**
+ * Split assignment operation in member object
+ *
+ * From:
+ * ```javascript
+ * (a = {})['b'] = c;
+ * ```
+ * To:
+ * ```javascript
+ * a = {}
+ * a['b'] = c;
+ * ```
+ */
+module.exports = {
+  MemberExpression: splitMemberObject,
+}