How to Initialize Imported Scripts

* [ ] **I'm submitting a bug report**
* [ ] **I'm submitting a feature request**
* [x] **I'm submitting a support request**

**webpack version:**
1.14

**sw-precache-webpack-plugin version**:
0.11.4

**Question**
How can I go about initializing an imported script? Specifically, I'm trying to implement [Offline Google Analytics](https://developers.google.com/web/updates/2016/07/offline-google-analytics).

There's documentation for importing the script but I'm not sure how to initialize afterward:
`importScripts('path/to/offline-google-analytics-import.js');
goog.offlineGoogleAnalytics.initialize();`