diff --git a/tools/build_rules/js.bzl b/tools/build_rules/js.bzl
index bb15c2c..a41f30c 100644
--- a/tools/build_rules/js.bzl
+++ b/tools/build_rules/js.bzl
@@ -174,6 +174,10 @@
         entry_points = [entry_point],
         srcs = entry_deps,
         define = NG_PROD_DEFINE if production else NG_DEV_DEFINE,
+        deps = [
+            "//:node_modules/@babel/core",
+            "//:node_modules/@angular/compiler-cli",
+        ],
         format = "esm",
         output_dir = True,
         splitting = True,
@@ -301,7 +305,7 @@
     copy_file(
         name = name + "__rollup_config",
         src = "//:rollup.config.js",
-        out = name + "__rollup_config.js",
+        out = name + "__rollup_config.mjs",
     )
 
     upstream_rollup_bundle(
@@ -312,7 +316,7 @@
         ],
         node_modules = node_modules,
         sourcemap = "false",
-        config_file = ":%s__rollup_config.js" % name,
+        config_file = ":%s__rollup_config.mjs" % name,
         entry_point = entry_point,
         **kwargs
     )
@@ -387,7 +391,7 @@
 
     copy_file(
         name = name + "_config",
-        out = name + "_cypress.config.js",
+        out = name + "_cypress.config.mjs",
         src = "//tools/build_rules/js:cypress.config.js",
         visibility = ["//visibility:private"],
     )
@@ -401,7 +405,7 @@
         name = name,
         args = [
             "run",
-            "--config-file=%s_cypress.config.js" % name,
+            "--config-file=%s_cypress.config.mjs" % name,
             "--browser=" + chrome_location,
         ],
         browsers = ["@chrome_linux//:all"],
diff --git a/tools/build_rules/js/BUILD b/tools/build_rules/js/BUILD
index 86a0288..4221b05 100644
--- a/tools/build_rules/js/BUILD
+++ b/tools/build_rules/js/BUILD
@@ -1,5 +1,6 @@
 load("@npm//:@angular/compiler-cli/package_json.bzl", angular_compiler_cli = "bin")
 load(":ts.bzl", "ts_project")
+load("@aspect_bazel_lib//lib:copy_file.bzl", "copy_file")
 
 exports_files([
     "cypress.config.js",
@@ -16,7 +17,6 @@
     name = "ngc.esbuild",
     srcs = ["ngc.esbuild.ts"],
     tsconfig = "//:tsconfig.node",
-    visibility = ["//visibility:public"],
     deps = [
         "//:node_modules/@angular/compiler-cli",
         "//:node_modules/@babel/core",
@@ -25,6 +25,13 @@
     ],
 )
 
+copy_file(
+    name = "ngc_esbuild_js_copy",
+    src = ":ngc.esbuild.js",
+    out = "ngc.esbuild.mjs",
+    visibility = ["//visibility:public"],
+)
+
 py_binary(
     name = "assemble_service_worker_files",
     srcs = [
diff --git a/tools/build_rules/js/ng.bzl b/tools/build_rules/js/ng.bzl
index 0a0f1e1..d4fe78c 100644
--- a/tools/build_rules/js/ng.bzl
+++ b/tools/build_rules/js/ng.bzl
@@ -20,6 +20,6 @@
 
     esbuild(
         name = name,
-        config = "//tools/build_rules/js:ngc.esbuild.js",
+        config = "//tools/build_rules/js:ngc.esbuild.mjs",
         **kwargs
     )