Assert a script is present on the page using nightwatchjs

I’m using nightwatchjs and trying to test whether a javascript script is present on a page or not.

Below is the html;

and I need to test that this is present on a particular page.

I understand that I could use Xpath (for example) and simply assert the following;

browser.assert.elementPresent('/html/head/script[10]/text()')

However, this isn’t really practical as scripts are often inserted before this script in due course which would fail the test due to the xpath of this script changing.

So, is there a way that I can pick out a certain part of this inserted javascript script (highlighted in yellow in the image above) and assert against this, rather than the whole script? This would then make the test far less brittle.

Many thanks