diff --git a/crates/loro-internal/examples/encoding.rs b/crates/loro-internal/examples/encoding.rs
index 532ce4e1..4ce1ee62 100644
--- a/crates/loro-internal/examples/encoding.rs
+++ b/crates/loro-internal/examples/encoding.rs
@@ -1,7 +1,7 @@
 use std::time::Instant;
 
 use bench_utils::TextAction;
-use loro_internal::LoroDoc;
+use loro_internal::{loro::ExportMode, LoroDoc};
 
 fn main() {
     let actions = bench_utils::get_automerge_actions();
@@ -54,6 +54,23 @@ fn main() {
         output.len(),
     );
 
+    let start = Instant::now();
+    let shallow_snapshot = loro
+        .export(ExportMode::shallow_snapshot(&loro.oplog_frontiers()))
+        .unwrap();
+    println!("Shallow Snapshot time {}ms", start.elapsed().as_millis());
+    let output = miniz_oxide::deflate::compress_to_vec(&shallow_snapshot, 6);
+    println!(
+        "Shallow Snapshot+compression time {}ms",
+        start.elapsed().as_millis()
+    );
+
+    println!(
+        "Shallow snapshot size {} after compression {}",
+        shallow_snapshot.len(),
+        output.len(),
+    );
+
     let updates = loro.export_from(&Default::default());
     let output = miniz_oxide::deflate::compress_to_vec(&updates, 6);
     println!(
diff --git a/crates/loro-internal/src/value.rs b/crates/loro-internal/src/value.rs
index cb44bffb..c25f7de1 100644
--- a/crates/loro-internal/src/value.rs
+++ b/crates/loro-internal/src/value.rs
@@ -566,7 +566,7 @@ pub mod wasm {
                         js_sys::Reflect::set(&obj, &"index".into(), &(*index).into()).unwrap();
                         js_sys::Reflect::set(
                             &obj,
-                            &"fractional_index".into(),
+                            &"fractionalIndex".into(),
                             &position.to_string().into(),
                         )
                         .unwrap();
@@ -578,11 +578,11 @@ pub mod wasm {
                         js_sys::Reflect::set(&obj, &"action".into(), &"delete".into()).unwrap();
                         js_sys::Reflect::set(
                             &obj,
-                            &"old_parent".into(),
+                            &"oldParent".into(),
                             &JsValue::from(old_parent.tree_id()),
                         )
                         .unwrap();
-                        js_sys::Reflect::set(&obj, &"old_index".into(), &(*old_index).into())
+                        js_sys::Reflect::set(&obj, &"oldIndex".into(), &(*old_index).into())
                             .unwrap();
                     }
                     TreeExternalDiff::Move {
@@ -602,17 +602,17 @@ pub mod wasm {
                         js_sys::Reflect::set(&obj, &"index".into(), &(*index).into()).unwrap();
                         js_sys::Reflect::set(
                             &obj,
-                            &"fractional_index".into(),
+                            &"fractionalIndex".into(),
                             &position.to_string().into(),
                         )
                         .unwrap();
                         js_sys::Reflect::set(
                             &obj,
-                            &"old_parent".into(),
+                            &"oldParent".into(),
                             &JsValue::from(old_parent.tree_id()),
                         )
                         .unwrap();
-                        js_sys::Reflect::set(&obj, &"old_index".into(), &(*old_index).into())
+                        js_sys::Reflect::set(&obj, &"oldIndex".into(), &(*old_index).into())
                             .unwrap();
                     }
                 }
diff --git a/crates/loro-wasm/src/lib.rs b/crates/loro-wasm/src/lib.rs
index 61c1e018..f2dfc01f 100644
--- a/crates/loro-wasm/src/lib.rs
+++ b/crates/loro-wasm/src/lib.rs
@@ -3525,7 +3525,7 @@ impl LoroTree {
             js_sys::Reflect::set(&obj, &"index".into(), &JsValue::from(index))?;
             js_sys::Reflect::set(
                 &obj,
-                &"fractional_index".into(),
+                &"fractionalIndex".into(),
                 &JsValue::from_str(&position),
             )?;
             js_sys::Reflect::set(&obj, &"meta".into(), &map.into())?;
diff --git a/loro-js/src/index.ts b/loro-js/src/index.ts
index 58d27983..7804284c 100644
--- a/loro-js/src/index.ts
+++ b/loro-js/src/index.ts
@@ -95,17 +95,17 @@ export type TreeDiffItem =
     action: "create";
     parent: TreeID | undefined;
     index: number;
-    fractional_index: string;
+    fractionalIndex: string;
   }
-  | { target: TreeID; action: "delete"; old_parent: TreeID | undefined; old_index: number }
+  | { target: TreeID; action: "delete"; oldParent: TreeID | undefined; oldIndex: number }
   | {
     target: TreeID;
     action: "move";
     parent: TreeID | undefined;
     index: number;
-    fractional_index: string;
-    old_parent: TreeID | undefined;
-    old_index: number;
+    fractionalIndex: string;
+    oldParent: TreeID | undefined;
+    oldIndex: number;
   };
 
 export type TreeDiff = {
diff --git a/loro-js/tests/misc.test.ts b/loro-js/tests/misc.test.ts
index c4b0f398..31c92669 100644
--- a/loro-js/tests/misc.test.ts
+++ b/loro-js/tests/misc.test.ts
@@ -246,6 +246,7 @@ describe("type", () => {
 describe("list stable position", () => {
   it("basic tests", () => {
     const loro = new LoroDoc();
+    loro.oplogFrontiers
     const list = loro.getList("list");
     list.insert(0, "a");
     const pos0 = list.getCursor(0);
diff --git a/loro-js/tests/tree.test.ts b/loro-js/tests/tree.test.ts
index 45ae3cd6..4e3a2651 100644
--- a/loro-js/tests/tree.test.ts
+++ b/loro-js/tests/tree.test.ts
@@ -93,7 +93,7 @@ describe("loro tree", () => {
     assert(keys.includes("id"));
     assert(keys.includes("parent"));
     assert(keys.includes("index"));
-    assert(keys.includes("fractional_index"));
+    assert(keys.includes("fractionalIndex"));
     assert(keys.includes("meta"));
     assert(keys.includes("children"));
   });
@@ -212,8 +212,8 @@ describe("loro tree node", () => {
       if (e.events[0].diff.type == "tree") {
         const diff = e.events[0].diff as TreeDiff;
         if (diff.diff[0].action == "move") {
-          assertEquals(diff.diff[0].old_parent, root.id);
-          assertEquals(diff.diff[0].old_index, 1);
+          assertEquals(diff.diff[0].oldParent, root.id);
+          assertEquals(diff.diff[0].oldIndex, 1);
         }
       }
     });