Add es6 build step

.npmignore

@@ -1,4 +1,5 @@
 !dist/lib/**/*.js
+!es/lib/**/*.js
 !typings/lib/**/*.d.ts
 .vscode/
 .idea/

package.json

@@ -26,6 +26,7 @@
     "clientruntime"
   ],
   "main": "./dist/lib/msRestAzure.js",
+  "browser": "./es/lib/msRestAzure.js",
   "types": "./typings/lib/msRestAzure.d.ts",
   "license": "MIT",
   "dependencies": {
@@ -55,8 +56,9 @@
     "url": "http://github.com/Azure/ms-rest-azure-js/issues"
   },
   "scripts": {
-    "build": "run-p build:node build:browser",
+    "build": "run-p build:node build:es build:browser",
     "build:node": "tsc",
+    "build:es": "tsc -p tsconfig.es.json",
     "build:browser": "webpack && node node_modules/uglify-es/bin/uglifyjs --source-map -c -m -o msRestAzureBundle.min.js msRestAzureBundle.js",
     "watch:node": "tsc -w",
     "watch:browser": "webpack -w",

tsconfig.es.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "es6",
+    "outDir": "es"
+  }
+}