From 7cc90dd6763c6bad204604643fbbc94d1b03a4b0 Mon Sep 17 00:00:00 2001
From: Daisuke Yamamoto <yamacentworld@yahoo.co.jp>
Date: Fri, 30 Oct 2020 21:18:17 +0900
Subject: [PATCH] Improve error message

---
 lib/index.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/index.js b/lib/index.js
index 990c86235..b10d6bd6f 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -129,7 +129,10 @@ module.exports = function (source) {
     const request = stringifyRequest(src + query)
     scriptImport = (
       `import script from ${request}\n` +
-      `export * from ${request}` // support named exports
+      `export * from ${request}\n` + // support named exports
+      `if (!script) {\n` +
+      `  throw new Error('Component ${src} does not have a default export.')\n` +
+      `}`
     )
   }