From 34d1614d67e97d9885681cae767506f0ab8fca5a Mon Sep 17 00:00:00 2001
From: Jason Lengstorf <jason@lengstorf.com>
Date: Sun, 17 Dec 2017 17:29:47 -0600
Subject: [PATCH] feat: check data sources for required properties

---
 lib/data-sources.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/data-sources.js b/lib/data-sources.js
index 09215f4..3b3411b 100644
--- a/lib/data-sources.js
+++ b/lib/data-sources.js
@@ -66,7 +66,14 @@ const loadDataSourceFromPath = dataSourcePath => {
   const src = require(dataSourcePath);
   const dataSource = src.default || src;
 
-  // TODO check for required properties.
+  if (!dataSource.namespace || !dataSource.context || !dataSource.typeDefs) {
+    error([
+      `Error: this data source is missing required properties:`,
+      dataSourcePath,
+    ]);
+
+    throw new Error('Invalid data source.');
+  }
 
   log(` -> successfully loaded ${dataSource.namespace}`);