diff --git a/core/isolate.rs b/core/isolate.rs
index b51b7fe47fe5f7..f277224d40acb4 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -340,6 +340,23 @@ impl Isolate {
     assert_ne!(snapshot.data_len, 0);
     Ok(snapshot)
   }
+
+  pub fn set_op_id(&self, op_namespace: &str, op_name: &str, op_id: u32) {
+    let op_namespace_ = CString::new(op_namespace.to_string()).unwrap();
+    let op_namespace_ptr = op_namespace_.as_ptr() as *const libc::c_char;
+
+    let op_name_ = CString::new(op_name.to_string()).unwrap();
+    let op_name_ptr = op_name_.as_ptr() as *const libc::c_char;
+
+    unsafe {
+      libdeno::deno_set_op_id(
+        self.libdeno_isolate,
+        op_namespace_ptr,
+        op_name_ptr,
+        op_id as *const libc::c_int,
+      )
+    }
+  }
 }
 
 /// Called during mod_instantiate() to resolve imports.
diff --git a/core/libdeno.rs b/core/libdeno.rs
index 046caaef655985..7e543a0d0584cc 100644
--- a/core/libdeno.rs
+++ b/core/libdeno.rs
@@ -292,6 +292,13 @@ extern "C" {
     id: deno_mod,
   );
 
+  pub fn deno_set_op_id(
+    i: *const isolate,
+    op_namespace: *const c_char,
+    op_name: *const c_char,
+    op_id: *const c_int,
+  );
+
   pub fn deno_snapshot_new(i: *const isolate) -> Snapshot1<'static>;
 
   #[allow(dead_code)]
diff --git a/core/libdeno/api.cc b/core/libdeno/api.cc
index bcdf7131b75bc6..340424b2fa529d 100644
--- a/core/libdeno/api.cc
+++ b/core/libdeno/api.cc
@@ -243,4 +243,41 @@ void deno_terminate_execution(Deno* d_) {
   deno::DenoIsolate* d = reinterpret_cast<deno::DenoIsolate*>(d_);
   d->isolate_->TerminateExecution();
 }
+
+void deno_set_op_id(Deno* d_, const char* op_namespace, const char* op_name,
+                    const int* op_id) {
+  auto* d = unwrap(d_);
+
+  auto* isolate = d->isolate_;
+  v8::Isolate::Scope isolate_scope(isolate);
+  v8::Locker locker(isolate);
+  v8::HandleScope handle_scope(isolate);
+  auto context = d->context_.Get(d->isolate_);
+  v8::Context::Scope context_scope(context);
+
+  v8::Local<v8::Object> global = context->Global();
+
+  v8::Local<v8::Object> deno_object = v8::Local<v8::Object>::Cast(
+      global->Get(context, deno::v8_str("Deno")).ToLocalChecked());
+
+  v8::Local<v8::Object> op_ids_object = v8::Local<v8::Object>::Cast(
+      deno_object->Get(context, deno::v8_str("opIds")).ToLocalChecked());
+
+  if (op_ids_object->Has(context, deno::v8_str(op_namespace)).FromJust()) {
+    v8::Local<v8::Value> op_ns_value =
+        op_ids_object->Get(context, deno::v8_str(op_namespace))
+            .ToLocalChecked();
+    auto op_ns_object = v8::Local<v8::Object>::Cast(op_ns_value);
+    auto op_id_val = deno::v8_int(op_id);
+    CHECK(op_ns_object->Set(context, deno::v8_str(op_name), op_id_val)
+              .FromJust());
+  } else {
+    auto op_ns_object = v8::Object::New(isolate);
+    auto op_id_val = deno::v8_int(op_id);
+    CHECK(op_ns_object->Set(context, deno::v8_str(op_name), op_id_val)
+              .FromJust());
+    CHECK(op_ids_object->Set(context, deno::v8_str(op_namespace), op_ns_object)
+              .FromJust());
+  }
+}
 }
diff --git a/core/libdeno/binding.cc b/core/libdeno/binding.cc
index 8001534ff59193..0b40dfd56fb144 100644
--- a/core/libdeno/binding.cc
+++ b/core/libdeno/binding.cc
@@ -476,6 +476,9 @@ void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context) {
 
   CHECK(core_val->SetAccessor(context, deno::v8_str("shared"), Shared)
             .FromJust());
+
+  auto op_ids_val = v8::Object::New(isolate);
+  CHECK(deno_val->Set(context, deno::v8_str("opIds"), op_ids_val).FromJust());
 }
 
 void MessageCallback(v8::Local<v8::Message> message,
diff --git a/core/libdeno/deno.h b/core/libdeno/deno.h
index f8bc9a82d47a8f..08e700339c6b2b 100644
--- a/core/libdeno/deno.h
+++ b/core/libdeno/deno.h
@@ -117,6 +117,9 @@ void deno_mod_instantiate(Deno* d, void* user_data, deno_mod id,
 // If it succeeded deno_last_exception() will return NULL.
 void deno_mod_evaluate(Deno* d, void* user_data, deno_mod id);
 
+void deno_set_op_id(Deno* d, const char* op_namespace, const char* op_name,
+                    const int* op_id);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif
diff --git a/core/libdeno/internal.h b/core/libdeno/internal.h
index 5e0051a8a6544b..dd0b663fffb3c1 100644
--- a/core/libdeno/internal.h
+++ b/core/libdeno/internal.h
@@ -139,6 +139,10 @@ static inline v8::Local<v8::String> v8_str(const char* x) {
       .ToLocalChecked();
 }
 
+static inline v8::Local<v8::Integer> v8_int(const int* x) {
+  return v8::Integer::New(v8::Isolate::GetCurrent(), *x);
+}
+
 void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
 void Recv(const v8::FunctionCallbackInfo<v8::Value>& args);
 void Send(const v8::FunctionCallbackInfo<v8::Value>& args);
diff --git a/core/libdeno/libdeno_test.cc b/core/libdeno/libdeno_test.cc
index ad4240da5dc0e6..4221c0756fd705 100644
--- a/core/libdeno/libdeno_test.cc
+++ b/core/libdeno/libdeno_test.cc
@@ -247,3 +247,14 @@ TEST(LibDenoTest, SharedAtomics) {
   EXPECT_EQ(s[2], 2);
   deno_delete(d);
 }
+
+TEST(LibDenoTest, CheckOpId) {
+  Deno* d = deno_new(deno_config{0, snapshot, empty, nullptr});
+  int test_op_id = 0;
+  deno_set_op_id(d, "testNamespace", "testOp", &test_op_id);
+  int test_op_2_id = 1;
+  deno_set_op_id(d, "testNamespace", "testOp2", &test_op_2_id);
+  deno_execute(d, nullptr, "a.js", "CheckOpId()");
+  EXPECT_EQ(nullptr, deno_last_exception(d));
+  deno_delete(d);
+}
diff --git a/core/libdeno/libdeno_test.js b/core/libdeno/libdeno_test.js
index 156af1e471c6f6..545adf2334c250 100644
--- a/core/libdeno/libdeno_test.js
+++ b/core/libdeno/libdeno_test.js
@@ -195,3 +195,8 @@ global.LibDenoEvalContextError = () => {
   assert(!errInfo5.isCompileError); // is NOT a compilation error! (just eval)
   assert(errInfo5.thrown.message === "Unexpected end of input");
 };
+
+global.CheckOpId = () => {
+  assert(Deno.opIds.testNamespace.testOp === 0);
+  assert(Deno.opIds.testNamespace.testOp2 === 1);
+};