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

packages/shims/dist/index.js

@@ -103,10 +103,12 @@
 (function (global){
 'use strict';
 
-var shims = [];
+(function() {
 
-// Shim String.prototype.normalize
-try {
+    var shims = [];
+
+    // Shim String.prototype.normalize
+    try {
         var missing = [];
 
         // Some platforms are missing certain normalization forms
@@ -131,51 +133,45 @@ try {
             shims.push("String.prototype.normalize (broken)");
             throw new Error('bad normalize');
         }
-} catch (error) {
+    } catch (error) {
         var unorm = require('./unorm.js');
         String.prototype.normalize = function(form) {
             var func = unorm[(form || 'NFC').toLowerCase()];
             if (!func) { throw new RangeError('invalid form - ' + form); }
             return func(this);
         }
-}
+    }
 
-// Shim atob and btoa
-var base64 = require('./base64.js');
-if (!global.atob) {
+    // Shim atob and btoa
+    var base64 = require('./base64.js');
+    if (!global.atob) {
         shims.push("atob");
         global.atob = base64.atob;
-}
-if (!global.btoa) {
+    }
+    if (!global.btoa) {
         shims.push("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) {
+    // Shim ArrayBuffer.isView
+    if (!ArrayBuffer.isView) {
         shims.push("ArrayBuffer.isView");
         ArrayBuffer.isView = function(obj) {
             // @TODO: This should probably check various instanceof aswell
             return !!(obj.buffer);
         }
-}
+    }
 
-// Shim nextTick
-if (!global.nextTick) {
+    // Shim nextTick
+    if (!global.nextTick) {
         shims.push("nextTick");
         global.nextTick = function (callback) { setTimeout(callback, 0); }
-}
+    }
 
-// Shim crypto.getRandomValues
-// @TOOD: Investigate: https://github.com/brix/crypto-js/issues/7
-if (!global.crypto) { global.crypto = { }; }
-if (!global.crypto.getRandomValues) {
+    // Shim crypto.getRandomValues
+    // @TOOD: Investigate: https://github.com/brix/crypto-js/issues/7
+    if (!global.crypto) { global.crypto = { }; }
+    if (!global.crypto.getRandomValues) {
         shims.push("crypto.getRandomValues");
         console.log("WARNING: This environment is missing a secure random source; generated private keys may be at risk, think VERY carefully about not adding a better secure source.");
         global.crypto.getRandomValues = function(buffer) {
@@ -184,11 +180,10 @@ if (!global.crypto.getRandomValues) {
                 buffer[(start + i) % buffer.length] = Math.floor(Math.random() * 256);
             }
         }
-}
+    }
 
-// Shim FileReader.readAsArrayBuffer
-// https://github.com/facebook/react-native/issues/21209
-(function() {
+    // Shim FileReader.readAsArrayBuffer
+    // https://github.com/facebook/react-native/issues/21209
     try {
         var fr = new FileReader();
         try {
@@ -217,14 +212,15 @@ if (!global.crypto.getRandomValues) {
     } catch (error) {
         console.log("Missing FileReader; unsupported platform");
     }
-})();
 
-if (shims.length) {
+    if (shims.length) {
         console.log("Shims Injected:");
         for (var i = 0; i < shims.length; i++) {
             console.log('  - ' + shims[i]);
         }
-}
+    }
+
+})();