Add support for Flow literal string/number types

Author: Markus Hsi-Yang Fritz

lib/flow_doctrine.js

@@ -11,6 +11,11 @@ var oneToOne = {
   }
 };
 
+var literalTypes = {
+  'StringLiteralTypeAnnotation': 'StringLiteral',
+  'NumberLiteralTypeAnnotation': 'NumberLiteral'
+};
+
 function flowDoctrine(type) {
 
   if (type.type in namedTypes) {
@@ -56,6 +61,13 @@ function flowDoctrine(type) {
       name: type.id.name
     };
   }
+
+  if (type.type in literalTypes) {
+    return {
+      type: literalTypes[type.type],
+      name: type.value
+    };
+  }
 }
 
 module.exports = flowDoctrine;