fix: emit when bundle contains single module (#4042)

Fixes #4031

When a bundle contains a single module, we were incorrectly determining
the module name, resulting in a non-functional bundle.  This PR corrects
that determination.

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/js/util.ts b/cli/js/util.ts
index e779fb5d7..faf4c99c6 100644
--- a/cli/js/util.ts
+++ b/cli/js/util.ts
@@ -306,7 +306,7 @@ export function normalizeString(
 export function commonPath(paths: string[], sep = "/"): string {
   const [first = "", ...remaining] = paths;
   if (first === "" || remaining.length === 0) {
-    return "";
+    return first.substring(0, first.lastIndexOf(sep) + 1);
   }
   const parts = first.split(sep);