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` +
+      `}`
     )
   }