From 01ca39589b5f1fed3c92131eee5632cf04bdc2a9 Mon Sep 17 00:00:00 2001
From: Donald Pipowitch <pipo@senaeh.de>
Date: Sat, 9 Nov 2019 14:33:43 +0100
Subject: [PATCH] check context in source-loader

---
 lib/source-loader/src/client/preview.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/source-loader/src/client/preview.js b/lib/source-loader/src/client/preview.js
index 7a03d3f576b..fede46c93c5 100644
--- a/lib/source-loader/src/client/preview.js
+++ b/lib/source-loader/src/client/preview.js
@@ -13,6 +13,14 @@ function sendEvent(
   prefix,
   idsToFrameworks
 ) {
+  if (!context || !context.id || !context.kind || !context.story) {
+    console.warn(
+      '@storybook/source-loader was applied to a file which does not contain a story. Please check your webpack configuration and make sure to apply @storybook/source-loader only to files containg stories. Related file:'
+    );
+    console.warn(source);
+    return;
+  }
+
   const channel = addons.getChannel();
   const currentLocation = getLocation(context, locationsMap);