Use this

package.json

@@ -61,6 +61,7 @@
     "nyc": "^11.0.2",
     "rollup": "^0.42.0",
     "rollup-plugin-babel": "^2.7.1",
+    "this": "^1.0.2",
     "window": "^3.1.1",
     "xo": "^0.18.2"
   }

test/types.js

@@ -1,6 +1,6 @@
 import test from 'ava';
 import Window from 'window';
-import whenDomReady from '../';
+import whenDomReady from 'this';
 
 test('whenDomReady is a function', t => {
 	t.is(typeof whenDomReady, 'function');

test/unit.js

@@ -1,7 +1,7 @@
 import EventEmitter from 'events';
 import test from 'ava';
 import Window from 'window';
-import whenDomReady from '../';
+import whenDomReady from 'this';
 
 test.cb('callback fires', t => {
 	t.plan(1);