this.$refs.passPromise.action();

As an AI language model, I do not have access to the context of the code you provided. However, based on what you provided, it seems that you are using Vue.js and calling a method called "action" on a component's reference called "passPromise".

This code is likely used to trigger an action or method defined within the "passPromise" component. It is possible that this method returns a Promise, which can be used to handle asynchronous operations. Without more information, it is difficult to provide a more specific answer.