Using ng-class to remove in Angular

I'm using ng-class to add a disabled class to a CTA in certain scenarios, but there is a split second delay before it gets applied, which means if the user is quick enough they can click the CTA. See code below:

<div ng-class="{'disabled-class': !testFunction(name)}">


If I was to change it to the below, obviously I can use JQuery / Vanilla JS to remove the class when needed, but is there a way to do something similar in Angular?

<div class="disabled-class">

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