diff --git a/.changeset/loud-dolls-pay.md b/.changeset/loud-dolls-pay.md
new file mode 100644
index 0000000000..de5a29cc44
--- /dev/null
+++ b/.changeset/loud-dolls-pay.md
@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+allow specifying only "index" without extension or nothing at all for "wrangler dev" and "wrangler publish"
diff --git a/packages/wrangler/src/dev.tsx b/packages/wrangler/src/dev.tsx
index 67e7cd9791..9a88115715 100644
--- a/packages/wrangler/src/dev.tsx
+++ b/packages/wrangler/src/dev.tsx
@@ -501,7 +501,8 @@ function useEsbuild(props: {
       });
 
       const chunks = Object.entries(result.metafile.outputs).find(
-        ([_path, { entryPoint }]) => entryPoint === entry
+        ([_path, { entryPoint }]) =>
+          entryPoint === Object.keys(result.metafile.inputs)[0]
       ); // assumedly only one entry point
 
       setBundle({
diff --git a/packages/wrangler/src/publish.ts b/packages/wrangler/src/publish.ts
index e80f40a4cc..ec0040dae8 100644
--- a/packages/wrangler/src/publish.ts
+++ b/packages/wrangler/src/publish.ts
@@ -125,7 +125,7 @@ export default async function publish(props: Props): Promise<void> {
       entryPoint ===
       (props.public
         ? path.join(path.dirname(file), "static-asset-facade.js")
-        : file)
+        : Object.keys(result.metafile.inputs)[0])
   );
 
   const { format } = props;