diff --git a/src/babel/traversal/path/resolution.js b/src/babel/traversal/path/resolution.js
index f561587253..00b1efce23 100644
--- a/src/babel/traversal/path/resolution.js
+++ b/src/babel/traversal/path/resolution.js
@@ -177,20 +177,7 @@ function checkBinary(name, path) {
   if (!typeofPath.get("argument").isIdentifier({ name })) return;
 
   // turn type value into a type annotation
-  var value = typePath.node.value;
-  if (value === "string") {
-    return t.stringTypeAnnotation();
-  } else if (value === "number") {
-    return t.numberTypeAnnotation();
-  } else if (value === "undefined") {
-    return t.voidTypeAnnotation();
-  } else if (value === "boolean") {
-    return t.booleanTypeAnnotation();
-  } else if (value === "function") {
-    // todo
-  } else if (value === "object") {
-    // todo
-  }
+  return t.createTypeAnnotationBasedOnTypeof(typePath.node.value);
 }
 
 function getParentConditional(path) {
diff --git a/src/babel/types/flow.js b/src/babel/types/flow.js
index 9414091ae8..d734f8385f 100644
--- a/src/babel/types/flow.js
+++ b/src/babel/types/flow.js
@@ -15,6 +15,10 @@ export function createUnionTypeAnnotation(types) {
   }
 }
 
+/**
+ * Description
+ */
+
 export function removeTypeDuplicates(nodes) {
   var generics = {};
   var bases = {};
@@ -90,3 +94,23 @@ export function removeTypeDuplicates(nodes) {
 
   return types;
 }
+
+/**
+ * Description
+ */
+
+export function createTypeAnnotationBasedOnTypeof(type) {
+  if (value === "string") {
+    return t.stringTypeAnnotation();
+  } else if (value === "number") {
+    return t.numberTypeAnnotation();
+  } else if (value === "undefined") {
+    return t.voidTypeAnnotation();
+  } else if (value === "boolean") {
+    return t.booleanTypeAnnotation();
+  } else if (value === "function") {
+    // todo
+  } else if (value === "object") {
+    // todo
+  }
+}