Make fastboot compatible

addon/components/async-image.js

@@ -1,4 +1,5 @@
 import Ember from 'ember';
+import isBrowser from 'ember-async-image/utils/is-browser';
 
 const {
   Component,
@@ -132,7 +133,7 @@ export default Component.extend({
 
   init() {
     this._super();
-    this._loadImage();
+    if (isBrowser) { this._loadImage(); }
   }
 
 });

addon/utils/is-browser.js

@@ -0,0 +1,13 @@
+/*
+Ye' ol annoying isBrower function to allow use of this library with fastboot.
+
+Use this within init() within components
+*/
+
+export default (function isBrowser() {
+  return typeof window   !== 'undefined' &&
+         typeof document !== 'undefined' &&
+         typeof process  === 'undefined' &&
+         !!window.document               &&
+         !!window.document.createElement;
+}());

app/utils/is-browser.js

@@ -0,0 +1 @@
+export { default } from 'ember-async-image/utils/is-browser';

tests/unit/utils/is-browser-test.js

@@ -0,0 +1,10 @@
+import isBrowser from '../../../utils/is-browser';
+import { module, test } from 'qunit';
+
+module('Unit | Utility | is browser');
+
+// Replace this with your real tests.
+test('it works', function(assert) {
+  var result = isBrowser();
+  assert.ok(result);
+});