diff --git a/packages/rollup/index.bzl b/packages/rollup/index.bzl
index 3d6d74a7ea..dec64a5e86 100644
--- a/packages/rollup/index.bzl
+++ b/packages/rollup/index.bzl
@@ -143,6 +143,7 @@ function parseStatusFile(p) {
   return results;
 }
 
+// This undefined variable will be replaced with the full path during the build.
 const statuses = parseStatusFile(bazel_version_file);
 // Parse the stamp file produced by Bazel from the version control system
 let version = '<unknown>';
diff --git a/packages/rollup/index.js b/packages/rollup/index.js
index 1bba45cdb4..4923ad28ba 100644
--- a/packages/rollup/index.js
+++ b/packages/rollup/index.js
@@ -239,6 +239,6 @@ async function main(args) {
   }
 }
 
-if (require.main === module) {
-  main(process.argv.slice(2)).then(r => (process.exitCode = r));
-}
+if (require.main == module) {
+  (async () => process.exitCode = await main(process.argv.slice(2)))();
+}
\ No newline at end of file
diff --git a/packages/rollup/test/version_stamp/rollup.config.js b/packages/rollup/test/version_stamp/rollup.config.js
index 6ed85d752a..735cc8f472 100644
--- a/packages/rollup/test/version_stamp/rollup.config.js
+++ b/packages/rollup/test/version_stamp/rollup.config.js
@@ -32,6 +32,7 @@ const DEBUG = process.env['COMPILATION_MODE'] === 'dbg';
 // Parse the stamp file produced by Bazel from the version control system
 let version = '<unknown>';
 
+// This undefined variable will be replaced with the full path during the build.
 const statuses = parseStatusFile(bazel_version_file);
 // Don't assume BUILD_SCM_VERSION exists
 if (statuses['BUILD_SCM_VERSION']) {