Updating shims for constrained environments (#944, #993).

packages/shims/dist/index.js

@@ -103,6 +103,8 @@
 (function (global){
 'use strict';
 
+(function() {
+
     var shims = [];
 
     // Shim String.prototype.normalize
@@ -151,12 +153,6 @@ if (!global.btoa) {
         global.btoa = base64.btoa;
     }
 
-// Shim Promise
-// @TODO: Check first?
-//if (window.Promise == null) {
-//    var promise = require('./es6-promise.auto.js');
-//}
-
     // Shim ArrayBuffer.isView
     if (!ArrayBuffer.isView) {
         shims.push("ArrayBuffer.isView");
@@ -188,7 +184,6 @@ if (!global.crypto.getRandomValues) {
 
     // Shim FileReader.readAsArrayBuffer
     // https://github.com/facebook/react-native/issues/21209
-(function() {
     try {
         var fr = new FileReader();
         try {
@@ -217,7 +212,6 @@ if (!global.crypto.getRandomValues) {
     } catch (error) {
         console.log("Missing FileReader; unsupported platform");
     }
-})();
 
     if (shims.length) {
         console.log("Shims Injected:");
@@ -226,6 +220,8 @@ if (shims.length) {
         }
     }
 
+})();
+