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+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/__wasm/deno_rust_wasm_js_sandbox/Cargo.toml b/__wasm/deno_rust_wasm_js_sandbox/Cargo.toml
new file mode 100644
index 0000000..3c579d8
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/Cargo.toml
@@ -0,0 +1,4 @@
+[workspace]
+members = [
+  "rs_lib",
+]
diff --git a/__wasm/deno_rust_wasm_js_sandbox/deno.json b/__wasm/deno_rust_wasm_js_sandbox/deno.json
new file mode 100644
index 0000000..ea91683
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/deno.json
@@ -0,0 +1,5 @@
+{
+  "tasks": {
+    "wasmbuild": "deno run -A https://deno.land/x/wasmbuild@0.8.2/main.ts"
+  }
+}
diff --git a/__wasm/deno_rust_wasm_js_sandbox/justfile b/__wasm/deno_rust_wasm_js_sandbox/justfile
new file mode 100644
index 0000000..f7e1063
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/justfile
@@ -0,0 +1,10 @@
+_:
+  @just --list
+
+build_wasm:
+   deno task wasmbuild
+
+run *ARGS:
+  deno run --allow-read main.js {{ ARGS }}
+
+
diff --git a/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine.generated.js b/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine.generated.js
new file mode 100644
index 0000000..da14857
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine.generated.js
@@ -0,0 +1,390 @@
+// @generated file from wasmbuild -- do not edit
+// deno-lint-ignore-file
+// deno-fmt-ignore-file
+// source-hash: 8da660663e79589e35cc62c575898459b04819a7
+let wasm;
+
+const heap = new Array(32).fill(undefined);
+
+heap.push(undefined, null, true, false);
+
+function getObject(idx) {
+  return heap[idx];
+}
+
+let heap_next = heap.length;
+
+function dropObject(idx) {
+  if (idx < 36) return;
+  heap[idx] = heap_next;
+  heap_next = idx;
+}
+
+function takeObject(idx) {
+  const ret = getObject(idx);
+  dropObject(idx);
+  return ret;
+}
+
+function addHeapObject(obj) {
+  if (heap_next === heap.length) heap.push(heap.length + 1);
+  const idx = heap_next;
+  heap_next = heap[idx];
+
+  heap[idx] = obj;
+  return idx;
+}
+
+const cachedTextDecoder = new TextDecoder("utf-8", {
+  ignoreBOM: true,
+  fatal: true,
+});
+
+cachedTextDecoder.decode();
+
+let cachedUint8Memory0;
+function getUint8Memory0() {
+  if (cachedUint8Memory0.byteLength === 0) {
+    cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
+  }
+  return cachedUint8Memory0;
+}
+
+function getStringFromWasm0(ptr, len) {
+  return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
+}
+
+let WASM_VECTOR_LEN = 0;
+
+const cachedTextEncoder = new TextEncoder("utf-8");
+
+const encodeString = function (arg, view) {
+  return cachedTextEncoder.encodeInto(arg, view);
+};
+
+function passStringToWasm0(arg, malloc, realloc) {
+  if (realloc === undefined) {
+    const buf = cachedTextEncoder.encode(arg);
+    const ptr = malloc(buf.length);
+    getUint8Memory0().subarray(ptr, ptr + buf.length).set(buf);
+    WASM_VECTOR_LEN = buf.length;
+    return ptr;
+  }
+
+  let len = arg.length;
+  let ptr = malloc(len);
+
+  const mem = getUint8Memory0();
+
+  let offset = 0;
+
+  for (; offset < len; offset++) {
+    const code = arg.charCodeAt(offset);
+    if (code > 0x7F) break;
+    mem[ptr + offset] = code;
+  }
+
+  if (offset !== len) {
+    if (offset !== 0) {
+      arg = arg.slice(offset);
+    }
+    ptr = realloc(ptr, len, len = offset + arg.length * 3);
+    const view = getUint8Memory0().subarray(ptr + offset, ptr + len);
+    const ret = encodeString(arg, view);
+
+    offset += ret.written;
+  }
+
+  WASM_VECTOR_LEN = offset;
+  return ptr;
+}
+
+let cachedInt32Memory0;
+function getInt32Memory0() {
+  if (cachedInt32Memory0.byteLength === 0) {
+    cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
+  }
+  return cachedInt32Memory0;
+}
+/**
+ * @param {string} script
+ * @returns {string}
+ */
+export function run_js(script) {
+  try {
+    const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
+    const ptr0 = passStringToWasm0(
+      script,
+      wasm.__wbindgen_malloc,
+      wasm.__wbindgen_realloc,
+    );
+    const len0 = WASM_VECTOR_LEN;
+    wasm.run_js(retptr, ptr0, len0);
+    var r0 = getInt32Memory0()[retptr / 4 + 0];
+    var r1 = getInt32Memory0()[retptr / 4 + 1];
+    return getStringFromWasm0(r0, r1);
+  } finally {
+    wasm.__wbindgen_add_to_stack_pointer(16);
+    wasm.__wbindgen_free(r0, r1);
+  }
+}
+
+function handleError(f, args) {
+  try {
+    return f.apply(this, args);
+  } catch (e) {
+    wasm.__wbindgen_exn_store(addHeapObject(e));
+  }
+}
+
+function getArrayU8FromWasm0(ptr, len) {
+  return getUint8Memory0().subarray(ptr / 1, ptr / 1 + len);
+}
+
+const imports = {
+  __wbindgen_placeholder__: {
+    __wbg_proxyfetch_da79e6ec8542a0a7: function (arg0, arg1, arg2) {
+      const ret = proxy_fetch(getStringFromWasm0(arg1, arg2));
+      const ptr0 = passStringToWasm0(
+        ret,
+        wasm.__wbindgen_malloc,
+        wasm.__wbindgen_realloc,
+      );
+      const len0 = WASM_VECTOR_LEN;
+      getInt32Memory0()[arg0 / 4 + 1] = len0;
+      getInt32Memory0()[arg0 / 4 + 0] = ptr0;
+    },
+    __wbg_randomFillSync_91e2b39becca6147: function () {
+      return handleError(function (arg0, arg1, arg2) {
+        getObject(arg0).randomFillSync(getArrayU8FromWasm0(arg1, arg2));
+      }, arguments);
+    },
+    __wbindgen_object_drop_ref: function (arg0) {
+      takeObject(arg0);
+    },
+    __wbg_getRandomValues_b14734aa289bc356: function () {
+      return handleError(function (arg0, arg1) {
+        getObject(arg0).getRandomValues(getObject(arg1));
+      }, arguments);
+    },
+    __wbg_process_e56fd54cf6319b6c: function (arg0) {
+      const ret = getObject(arg0).process;
+      return addHeapObject(ret);
+    },
+    __wbindgen_is_object: function (arg0) {
+      const val = getObject(arg0);
+      const ret = typeof (val) === "object" && val !== null;
+      return ret;
+    },
+    __wbg_versions_77e21455908dad33: function (arg0) {
+      const ret = getObject(arg0).versions;
+      return addHeapObject(ret);
+    },
+    __wbg_node_0dd25d832e4785d5: function (arg0) {
+      const ret = getObject(arg0).node;
+      return addHeapObject(ret);
+    },
+    __wbindgen_is_string: function (arg0) {
+      const ret = typeof (getObject(arg0)) === "string";
+      return ret;
+    },
+    __wbg_static_accessor_NODE_MODULE_26b231378c1be7dd: function () {
+      const ret = module;
+      return addHeapObject(ret);
+    },
+    __wbg_require_0db1598d9ccecb30: function () {
+      return handleError(function (arg0, arg1, arg2) {
+        const ret = getObject(arg0).require(getStringFromWasm0(arg1, arg2));
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbg_crypto_b95d7173266618a9: function (arg0) {
+      const ret = getObject(arg0).crypto;
+      return addHeapObject(ret);
+    },
+    __wbg_msCrypto_5a86d77a66230f81: function (arg0) {
+      const ret = getObject(arg0).msCrypto;
+      return addHeapObject(ret);
+    },
+    __wbg_newnoargs_fc5356289219b93b: function (arg0, arg1) {
+      const ret = new Function(getStringFromWasm0(arg0, arg1));
+      return addHeapObject(ret);
+    },
+    __wbg_call_4573f605ca4b5f10: function () {
+      return handleError(function (arg0, arg1) {
+        const ret = getObject(arg0).call(getObject(arg1));
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbindgen_object_clone_ref: function (arg0) {
+      const ret = getObject(arg0);
+      return addHeapObject(ret);
+    },
+    __wbg_self_ba1ddafe9ea7a3a2: function () {
+      return handleError(function () {
+        const ret = self.self;
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbg_window_be3cc430364fd32c: function () {
+      return handleError(function () {
+        const ret = window.window;
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbg_globalThis_56d9c9f814daeeee: function () {
+      return handleError(function () {
+        const ret = globalThis.globalThis;
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbg_global_8c35aeee4ac77f2b: function () {
+      return handleError(function () {
+        const ret = global.global;
+        return addHeapObject(ret);
+      }, arguments);
+    },
+    __wbindgen_is_undefined: function (arg0) {
+      const ret = getObject(arg0) === undefined;
+      return ret;
+    },
+    __wbg_buffer_de1150f91b23aa89: function (arg0) {
+      const ret = getObject(arg0).buffer;
+      return addHeapObject(ret);
+    },
+    __wbg_new_97cf52648830a70d: function (arg0) {
+      const ret = new Uint8Array(getObject(arg0));
+      return addHeapObject(ret);
+    },
+    __wbg_set_a0172b213e2469e9: function (arg0, arg1, arg2) {
+      getObject(arg0).set(getObject(arg1), arg2 >>> 0);
+    },
+    __wbg_length_e09c0b925ab8de5d: function (arg0) {
+      const ret = getObject(arg0).length;
+      return ret;
+    },
+    __wbg_newwithlength_e833b89f9db02732: function (arg0) {
+      const ret = new Uint8Array(arg0 >>> 0);
+      return addHeapObject(ret);
+    },
+    __wbg_subarray_9482ae5cd5cd99d3: function (arg0, arg1, arg2) {
+      const ret = getObject(arg0).subarray(arg1 >>> 0, arg2 >>> 0);
+      return addHeapObject(ret);
+    },
+    __wbindgen_throw: function (arg0, arg1) {
+      throw new Error(getStringFromWasm0(arg0, arg1));
+    },
+    __wbindgen_memory: function () {
+      const ret = wasm.memory;
+      return addHeapObject(ret);
+    },
+  },
+};
+
+const wasm_url = new URL("boa_wasm_engine_bg.wasm", import.meta.url);
+
+/**
+ * Decompression callback
+ *
+ * @callback decompressCallback
+ * @param {Uint8Array} compressed
+ * @return {Uint8Array} decompressed
+ */
+
+/** Instantiates an instance of the Wasm module returning its functions.
+ * @remarks It is safe to call this multiple times and once successfully
+ * loaded it will always return a reference to the same object.
+ * @param {decompressCallback=} transform
+ */
+export async function instantiate(transform) {
+  return (await instantiateWithInstance(transform)).exports;
+}
+
+let instanceWithExports;
+let lastLoadPromise;
+
+/** Instantiates an instance of the Wasm module along with its exports.
+ * @remarks It is safe to call this multiple times and once successfully
+ * loaded it will always return a reference to the same object.
+ * @param {decompressCallback=} transform
+ * @returns {Promise<{
+ *   instance: WebAssembly.Instance;
+ *   exports: { run_js: typeof run_js }
+ * }>}
+ */
+export function instantiateWithInstance(transform) {
+  if (instanceWithExports != null) {
+    return Promise.resolve(instanceWithExports);
+  }
+  if (lastLoadPromise == null) {
+    lastLoadPromise = (async () => {
+      try {
+        const instance = (await instantiateModule(transform)).instance;
+        wasm = instance.exports;
+        cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
+        cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
+        instanceWithExports = {
+          instance,
+          exports: getWasmInstanceExports(),
+        };
+        return instanceWithExports;
+      } finally {
+        lastLoadPromise = null;
+      }
+    })();
+  }
+  return lastLoadPromise;
+}
+
+function getWasmInstanceExports() {
+  return { run_js };
+}
+
+/** Gets if the Wasm module has been instantiated. */
+export function isInstantiated() {
+  return instanceWithExports != null;
+}
+
+async function instantiateModule(transform) {
+  switch (wasm_url.protocol) {
+    case "file:": {
+      if (typeof Deno !== "object") {
+        throw new Error("file urls are not supported in this environment");
+      }
+
+      if ("permissions" in Deno) {
+        Deno.permissions.request({ name: "read", path: wasm_url });
+      }
+      const wasmCode = await Deno.readFile(wasm_url);
+      return WebAssembly.instantiate(
+        !transform ? wasmCode : transform(wasmCode),
+        imports,
+      );
+    }
+    case "https:":
+    case "http:": {
+      if (typeof Deno === "object" && "permissions" in Deno) {
+        Deno.permissions.request({ name: "net", host: wasm_url.host });
+      }
+      const wasmResponse = await fetch(wasm_url);
+      if (transform) {
+        const wasmCode = new Uint8Array(await wasmResponse.arrayBuffer());
+        return WebAssembly.instantiate(transform(wasmCode), imports);
+      }
+      if (
+        wasmResponse.headers.get("content-type")?.toLowerCase().startsWith(
+          "application/wasm",
+        )
+      ) {
+        return WebAssembly.instantiateStreaming(wasmResponse, imports);
+      } else {
+        return WebAssembly.instantiate(
+          await wasmResponse.arrayBuffer(),
+          imports,
+        );
+      }
+    }
+    default:
+      throw new Error(`Unsupported protocol: ${wasm_url.protocol}`);
+  }
+}
diff --git a/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine_bg.wasm b/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine_bg.wasm
new file mode 100644
index 0000000..345bc6f
Binary files /dev/null and b/__wasm/deno_rust_wasm_js_sandbox/lib/boa_wasm_engine_bg.wasm differ
diff --git a/__wasm/deno_rust_wasm_js_sandbox/main.js b/__wasm/deno_rust_wasm_js_sandbox/main.js
new file mode 100644
index 0000000..e361be8
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/main.js
@@ -0,0 +1,16 @@
+window.proxy_fetch = function () {
+    return JSON.stringify({
+        "result": "{\"a\": 111}"
+    });
+};
+
+import { instantiate } from "./lib/boa_wasm_engine.generated.js";
+const { run_js } = await instantiate();
+
+async function main() {
+    for (let i = 0; i < 10; i++) {
+        console.log(run_js('let x = fetch();x.a;let v = [];while(true){v.push("1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdjfljsalfsklfjladsjflklsdfjla1adflasdj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+    }
+}
+
+await main();
diff --git a/__wasm/deno_rust_wasm_js_sandbox/rs_lib/Cargo.toml b/__wasm/deno_rust_wasm_js_sandbox/rs_lib/Cargo.toml
new file mode 100644
index 0000000..4c56532
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/rs_lib/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "boa_wasm_engine"
+version = "0.0.0"
+edition = "2021"
+
+[lib]
+crate_type = ["cdylib"]
+
+[profile.release]
+codegen-units = 1
+incremental = true
+lto = true
+opt-level = "z"
+
+[dependencies]
+wasm-bindgen = "=0.2.81"
+boa_engine = "0.15.0"
+getrandom = { version = "0.2", features = ["js"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
diff --git a/__wasm/deno_rust_wasm_js_sandbox/rs_lib/src/lib.rs b/__wasm/deno_rust_wasm_js_sandbox/rs_lib/src/lib.rs
new file mode 100644
index 0000000..561c226
--- /dev/null
+++ b/__wasm/deno_rust_wasm_js_sandbox/rs_lib/src/lib.rs
@@ -0,0 +1,51 @@
+use boa_engine::{Context, JsResult, JsString, JsValue};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+extern {
+    fn proxy_fetch(options: &str) -> String;
+}
+// #[wasm_bindgen]
+// extern {
+//     fn alert(msg: &str);
+// }
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+struct FetchResult {
+    error: Option<String>,
+    result: Option<String>,
+}
+
+// n(&JsValue, &[JsValue], &mut Context) -> JsResult<JsValue>
+fn fetch_fn(_: &JsValue, args: &[JsValue], ctx: &mut Context) -> JsResult<JsValue> {
+    let mut options = String::new();
+    options.push('[');
+    args.iter().enumerate().for_each(|(i, arg)| {
+        if i > 0 { options.push(','); }
+        options.push_str(arg.to_json(ctx).expect("to json error").as_str().expect("as str error"))
+    });
+    options.push(']');
+    // let r = serde_json::to_string(args).unwrap();
+    let fetch_result_string = proxy_fetch(&options);
+    let fetch_result: FetchResult = serde_json::from_str(&fetch_result_string).expect("from str error");
+    if let Some(result) = fetch_result.result {
+        let r: Value = serde_json::from_str(&result).expect("result from str error");
+        let v = JsValue::from_json(&r, ctx).unwrap();
+        return JsResult::Ok(v);
+    }
+    JsResult::Err(JsValue::String(JsString::from(format!("Invoke fetch error: {}", fetch_result.error.unwrap_or("".to_string())))))
+}
+
+#[wasm_bindgen]
+pub fn run_js(script: String) -> String {
+    let mut ctx = Context::default();
+    ctx.register_global_function("fetch", 0, fetch_fn);
+    let o = match ctx.eval(script) {
+        JsResult::Ok(o) => o,
+        JsResult::Err(o) => o,
+    };
+    format!("{}", o.to_json(&mut ctx).unwrap())
+}
+