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I resolved what I needed by using the nativescript event handler instead of vue’s event handler interface. https://docs.nativescript.org/core-concepts/events
I was trying to listen to a page event, so my code looks something like this:
const Page = require('tns-core-modules/ui/page').Page
const componentPage = vueComponent.nativeView.page
componentPage.on(Page.navigatedFromEvent, myHandlerMethod)
Source:stackexchange.com