Pre-boot JavaScript


I’m looking for a pattern for code that should run before Ember boots. I’m thinking of things like initializing tracking libraries and checking browser compatibility.

ember-cli-google-analytics injects an inline <script> into <head>. I don’t love that because it violates Content-Security-Policy (unless you generate a cryptographic hash of the inline script contents and add that to the CSP definition).

Another option would be putting the code in app/initializers/. I don’t love that (at least for the browser-compatibility detection) because the browser may never get to initializers.

I’m considering adding a pre-boot/ directory that gets appended to app.js without being wrapped in require.define blocks so it executes immediately.

Does anyone have a pattern they really like?


How about adding your code to vendor/whatever-correct-name.js? It gets prepended to the vendor.js file, hence run before your app.

And if you want to pass some of the gathered config to the app or control when/if your app should start, here’s an addon that could be useful:

Hope this helps,


Forget about the plugin. By the time your code in you vendor file runs, you can’t get the reference to the (unstarted) app. That won’t work as easily… :thinking: