fix(cli): bundle command support shebang file (#17113)

1 files changed, 19 insertions, 2 deletions

diff --git a/cli/tools/bundle.rs b/cli/tools/bundle.rs
index 375a64088..a248c0385 100644
--- a/cli/tools/bundle.rs
+++ b/cli/tools/bundle.rs
@@ -147,12 +147,29 @@ fn bundle_module_graph(
     }
   }
 
-  deno_emit::bundle_graph(
+  let mut output = deno_emit::bundle_graph(
     graph,
     deno_emit::BundleOptions {
       bundle_type: deno_emit::BundleType::Module,
       emit_options: ts_config_result.ts_config.into(),
       emit_ignore_directives: true,
     },
-  )
+  )?;
+
+  // todo(https://github.com/denoland/deno_emit/issues/85): move to deno_emit
+  if let Some(shebang) = shebang_file(graph) {
+    output.code = format!("{}\n{}", shebang, output.code);
+  }
+
+  Ok(output)
+}
+
+fn shebang_file(graph: &deno_graph::ModuleGraph) -> Option<String> {
+  let source = graph.get(&graph.roots[0].0)?.maybe_source.as_ref()?;
+  let first_line = source.lines().next()?;
+  if first_line.starts_with("#!") {
+    Some(first_line.to_string())
+  } else {
+    None
+  }
 }