feat(warning): warn if the hook returns undefined, close #10

bahmutov · May 4, 2017 · dccdd7e · dccdd7e
1 parent 7ca6029
commit dccdd7e
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/index.js b/index.js
@@ -66,6 +66,10 @@ function hook (extension, transform, options) {
     nestedTransforms[extension].every(function (nested) {
       // nesting order performs earlier first, later last
       ret = nested(source, filename)
+      if (ret === undefined) {
+        console.error('🔥  source transform returned undefined for file',
+          filename)
+      }
       source = ret + '' // convert to string and keep going
       return true // continue
     })

diff --git a/test/jsTest.js b/test/jsTest.js
@@ -25,4 +25,4 @@ gt.test('basics', function () {
   });
   require('./dummy');
   gt.ok(transformCalled, 'transform function was called');
-});
+});