1 files changed, 12 insertions, 6 deletions
diff --git a/runtime/build.rs b/runtime/build.rs
index e5d0067a7..dd222a8a0 100644
--- a/runtime/build.rs
+++ b/runtime/build.rs
@@ -24,16 +24,23 @@ mod startup_snapshot {
   fn transpile_ts_for_snapshotting(
     file_source: &ExtensionFileSource,
   ) -> Result<ModuleCode, AnyError> {
-    let media_type = MediaType::from_path(Path::new(&file_source.specifier));
+    // Always transpile `node:` built-in modules, since they might be TypeScript.
+    let media_type = if file_source.specifier.starts_with("node:") {
+      MediaType::TypeScript
+    } else {
+      MediaType::from_path(Path::new(&file_source.specifier))
+    };
 
     let should_transpile = match media_type {
       MediaType::JavaScript => false,
       MediaType::Mjs => false,
       MediaType::TypeScript => true,
-      _ => panic!(
-        "Unsupported media type for snapshotting {media_type:?} for file {}",
-        file_source.specifier
-      ),
+      _ => {
+        panic!(
+          "Unsupported media type for snapshotting {media_type:?} for file {}",
+          file_source.specifier
+        )
+      }
     };
     let code = file_source.load()?;
 
@@ -284,7 +291,6 @@ mod startup_snapshot {
     runtime_main,
     deps = [runtime],
     customizer = |ext: &mut deno_core::ExtensionBuilder| {
-      eprintln!("I am here!!!");
       ext.esm_entry_point("ext:runtime/90_deno_ns.js");
     }
   );