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diff --git a/third_party/immer/extra/js/index.js b/third_party/immer/extra/js/index.js
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+++ b/third_party/immer/extra/js/index.js
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+/*
+ * immer: immutable data structures for C++
+ * Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+ *
+ * This software is distributed under the Boost Software License, Version 1.0.
+ * See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+ */
+
+var immer = Module
+
+var N = 1000
+
+var suite = new Benchmark.Suite('push')
+    .add('Immutable.List', function(){
+        var v = new Immutable.List
+        for (var x = 0; x < N; ++x)
+            v = v.push(x)
+    })
+    .add('mori.vector', function(){
+        var v = mori.vector()
+        for (var x = 0; x < N; ++x)
+            v = mori.conj.f2(v, x)
+    })
+    .add('mori.vector-Transient', function(){
+        var v = mori.mutable.thaw(mori.vector())
+        for (var x = 0; x < N; ++x)
+            v = mori.mutable.conj.f2(v, x)
+        return mori.mutable.freeze(v)
+    })
+    .add('immer.Vector', function(){
+        var v = new immer.Vector
+        for (var x = 0; x < N; ++x) {
+            var v_ = v
+            v = v.push(x)
+            v_.delete()
+        }
+    })
+    .add('immer.VectorInt', function(){
+        var v = new immer.VectorInt
+        for (var x = 0; x < N; ++x) {
+            var v_ = v
+            v = v.push(x)
+            v_.delete()
+        }
+        v.delete()
+    })
+    .add('immer.VectorNumber', function(){
+        var v = new immer.VectorNumber
+        for (var x = 0; x < N; ++x) {
+            var v_ = v
+            v = v.push(x)
+            v_.delete()
+        }
+        v.delete()
+    })
+    .add('immer.VectorInt-Native', function(){
+        immer.rangeSlow_int(0, N).delete()
+    })
+    .add('immer.VectorInt-NativeTransient', function(){
+        immer.range_int(0, N).delete()
+    })
+    .add('immer.VectorDouble-Native', function(){
+        immer.rangeSlow_double(0, N).delete()
+    })
+    .add('immer.VectorDouble-NativeTransient', function(){
+        immer.range_double(0, N).delete()
+    })
+    .on('cycle', function(event) {
+        console.log(String(event.target));
+    })
+    .on('complete', function() {
+        console.log('Fastest is ' + this.filter('fastest').map('name'));
+    })
+    .run({ 'async': true })