Handle missing sourcemap for empty bundle output

Author: dannote

native/oxc_ex_nif/src/bundle.rs

@@ -380,12 +380,12 @@ fn run_rolldown(
     }
 
     let sourcemap = if opts.sourcemap {
-        let sourcemap_json = chunk
+        chunk
             .map
             .as_ref()
             .map(oxc_sourcemap::SourceMap::to_json_string)
-            .ok_or_else(|| vec!["Rolldown did not produce a source map".to_string()])?;
-        Some(relativize_sourcemap_sources(sourcemap_json, &cwd)?)
+            .map(|json| relativize_sourcemap_sources(json, &cwd))
+            .transpose()?
     } else {
         None
     };

test/bundle_test.exs

@@ -367,6 +367,12 @@ defmodule OXC.BundleTest do
       refute Enum.any?(map["sources"], &String.ends_with?(&1, "bundle.js"))
     end
 
+    test "returns code without sourcemap for empty bundle" do
+      files = [{"main.js", ""}]
+      {:ok, code} = OXC.bundle(files, entry: "main.js", sourcemap: true, format: :iife)
+      assert is_binary(code)
+    end
+
     test "sourcemap works with minify" do
       files = [
         {"a.ts", "export const x = 1;"},