move deprecation check down

src/babel/transformation/file/index.js

@@ -104,12 +104,14 @@ export default class File {
 
     for (let key in File.options) {
       let option = File.options[key];
+
+      var val = opts[key];
+      if (!val && option.optional) continue;
+
       if (option.deprecated) {
         throw new Error("Deprecated option " + key + ": " + option.deprecated);
       }
 
-      var val = opts[key];
-      if (!val && option.optional) continue;
       if (val == null) val = option.default || val;
 
       var optionParser = optionParsers[option.type];

src/babel/transformation/transformers/es7/decorators.js

@@ -1,5 +1,4 @@
 export var metadata = {
-  experimental: true,
   optional: true,
   stage: 1
 };

src/babel/transformation/transformers/es7/do-expressions.js

@@ -1,7 +1,6 @@
 import * as t from "../../../types";
 
 export var metadata = {
-  experimental: true,
   optional: true,
   stage: 0
 };