Add invariant for unreachable condition

JeffRMoore · JeffRMoore · commit 7a15a3f17452 · 2016-03-12T17:09:20.000-08:00
diff --git a/src/execution/execute.js b/src/execution/execute.js
@@ -732,7 +732,10 @@ function completeValue(
   }
 
   // Not reachable
-  return null;
+  invariant(
+    false,
+    `Cannot complete value of unexpected type "${returnType}".`
+  );
 }
 
 /**

Original file line number	Diff line number	Diff line change
`@@ -732,7 +732,10 @@ function completeValue(`
`732`	`732`	`}`
`733`	`733`
`734`	`734`	`// Not reachable`
`735`		`- return null;`
	`735`	`+ invariant(`
	`736`	`+ false,`
	`737`	+ `Cannot complete value of unexpected type "${returnType}".`
	`738`	`+ );`
`736`	`739`	`}`
`737`	`740`
`738`	`741`	`/**`